Change Node association of ASM instance
Hi,
I have a 4-node cluster running RHEL 5 and GI - 11.2.0.2. After a successful installation we discovered that the asm instance association got switched between Node 2 & Node 3.
e.g., - Node 2 is running ASM3 instance
Node 3 is running ASM2 instance.
Is it possible to correct this, or do I need to rebuild the whole cluster again!?
Thanks,
AbbY
Hi AbbY,
this is the result, that the root.sh on node 3 was faster than the one on node 2 during install.
If you would like to have the ASM instance in a specific order after installation, you have to run them sequentially (and nor in parallel).
But one thing you should also be aware of, is that the ASM number in 11.2 is not fix anymore:
=> The ASM instance number is dependant on the node number (olsnodes -n -i -t -s).
=> Each nodes gets a lease for the node number for approx. 1 week. It's like a DHCP lease, which can expire if not started.
So if you would shut down node 2 and 3 for one week and then restart the nodes in a different order, lease would change (and therefor the ASM instance number).
Which leads to the further question (because this is really flexible): Why do you want the +ASM instances to have fixed names?
If your nodes would be "Mars" and "Pluto", would it matter where ASM1 and ASM2 runs on?
If you say: We need to know for sqlplus to connect to ASM instance. Why not simply connect this way to ASM:
sqlplus sys/pwd@hostname:port/+ASM
You will always end up on the ASM instance on the node (no matter what instance number the ASM instance has on that node).
O.k. I have to admit there are still a few tools who need the instance number (like asmcmd), but I know this necessity will change, since cluster gets more flexible in the future.
Sebastian
Similar Messages
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One node is up but when we start the crs on node 2 then ASM instance killed.
Hi Friends
i am facing below strange problem
one node is up but when we start the crs on node 2 then ASM instance killed. i found that one ip 169.254.98.19 is binding with private interconnect IP rathter than assigned IP.
Please help meHi Pradeep ,
Oracle S/W verstion is 11.2.0.3. Actually , we start the CRS and DB on node 1 but when we try to start on node 2 , getting below error.
[gpnpd(18284748)]CRS-2328:GPNPD started on node ggnetp04.
2013-09-03 19:48:29.162
[cssd(17694820)]CRS-1713:CSSD daemon is started in clustered mode
2013-09-03 19:48:30.557
[ohasd(13697160)]CRS-2767:Resource state recovery not attempted for 'ora.diskmon' as its target state is OFFLINE
2013-09-03 19:48:41.013
[cssd(17694820)]CRS-1707:Lease acquisition for node ggnetp04 number 2 completed
2013-09-03 19:48:42.490
[cssd(17694820)]CRS-1605:CSSD voting file is online: /dev/rhdiskpower0; details in /opt/app/11.2.0.3/grid/log/ggnetp04/cssd/ocssd.log.
2013-09-03 19:48:45.483
[cssd(17694820)]CRS-1601:CSSD Reconfiguration complete. Active nodes are ggnetp03 ggnetp04 .
2013-09-03 19:48:47.257
[ctssd(18022612)]CRS-2403:The Cluster Time Synchronization Service on host ggnetp04 is in observer mode.
2013-09-03 19:48:47.632
[ctssd(18022612)]CRS-2407:The new Cluster Time Synchronization Service reference node is host ggnetp03.
2013-09-03 19:48:47.633
[ctssd(18022612)]CRS-2401:The Cluster Time Synchronization Service started on host ggnetp04.
[client(16056466)]CRS-10001:03-Sep-13 19:48 ACFS-9391: Checking for existing ADVM/ACFS installation.
[client(16056468)]CRS-10001:03-Sep-13 19:48 ACFS-9392: Validating ADVM/ACFS installation files for operating system.
[client(16056470)]CRS-10001:03-Sep-13 19:48 ACFS-9393: Verifying ASM Administrator setup.
[client(16056472)]CRS-10001:03-Sep-13 19:48 ACFS-9308: Loading installed ADVM/ACFS drivers.
[client(16056478)]CRS-10001:03-Sep-13 19:48 ACFS-9154: Loading 'oracleadvm.ext' driver.
[client(16056486)]CRS-10001:03-Sep-13 19:48 ACFS-9154: Loading 'oracleacfs.ext' driver.
[client(16056494)]CRS-10001:03-Sep-13 19:48 ACFS-9327: Verifying ADVM/ACFS devices.
[client(16056498)]CRS-10001:03-Sep-13 19:48 ACFS-9156: Detecting control device '/dev/asm/.asm_ctl_spec'.
[client(16056504)]CRS-10001:03-Sep-13 19:48 ACFS-9156: Detecting control device '/dev/ofsctl'.
[client(16056508)]CRS-10001:03-Sep-13 19:48 ACFS-9322: completed
2013-09-03 19:48:59.667
[ctssd(18022612)]CRS-2409:The clock on host ggnetp04 is not synchronous with the mean cluster time. No action has been taken as the Cluster Time Synchronization Service is running in observer mode.
2013-09-03 19:50:53.936
[cssd(17694820)]CRS-1662:Member kill requested by node ggnetp03 for member number 1, group DB+ASM
2013-09-03 19:50:57.493
[/opt/app/11.2.0.3/grid/bin/oraagent.bin(16777322)]CRS-5019:All OCR locations are on ASM disk groups [DATA], and none of these disk groups are mounted. Details are at "(:CLSN00100:)" in "/opt/app/11.2.0.3/grid/log/ggnetp04/agent/ohasd/oraagent_grid/oraagent_grid.log".
2013-09-03 19:50:57.494
[/opt/app/11.2.0.3/grid/bin/oraagent.bin(16777322)]CRS-5011:Check of resource "+ASM" failed: details at "(:CLSN00006:)" in "/opt/app/11.2.0.3/grid/log/ggnetp04/agent/ohasd/oraagent_grid/oraagent_grid.log"
2013-09-03 19:50:58.828
[/opt/app/11.2.0.3/grid/bin/oraagent.bin(16777322)]CRS-5019:All OCR locations are on ASM disk groups [DATA], and none of these disk groups are mounted. Details are at "(:CLSN00100:)" in "/opt/app/11.2.0.3/grid/log/ggnetp04/agent/ohasd/oraagent_grid/oraagent_grid.log".
2013-09-03 19:50:58.943
[/opt/app/11.2.0.3/grid/bin/oraagent.bin(16777322)]CRS-5019:All OCR locations are on ASM disk groups [DATA], and none of these disk groups are mounted. Details are at "(:CLSN00100:)" in "/opt/app/11.2.0.3/grid/log/ggnetp04/agent/ohasd/oraagent_grid/oraagent_grid.log".
2013-09-03 19:50:59.235
[/opt/app/11.2.0.3/grid/bin/oraagent.bin(16777322)]CRS-5019:All OCR locations are on ASM disk groups [DATA], and none of these disk groups are mounted. Details are at "(:CLSN00100:)" in "/opt/app/11.2.0.3/grid/log/ggnetp04/agent/ohasd/oraagent_grid/oraagent_grid.log".
2013-09-03 19:53:00.252
[cssd(17694820)]CRS-1662:Member kill requested by node ggnetp03 for member number 1, group DB+ASM
2013-09-03 19:53:03.101
[/opt/app/11.2.0.3/grid/bin/oraagent.bin(16777322)]CRS-5019:All OCR locations are on ASM disk groups [DATA], and none of these disk groups are mounted. Details are at "(:CLSN00100:)" in "/opt/app/11.2.0.3/grid/log/ggnetp04/agent/ohasd/oraagent_grid/oraagent_grid.log".
2013-09-03 19:53:03.102
[/opt/app/11.2.0.3/grid/bin/oraagent.bin(16777322)]CRS-5011:Check of resource "+ASM" failed: details at "(:CLSN00006:)" in "/opt/app/11.2.0.3/grid/log/ggnetp04/agent/ohasd/oraagent_grid/oraagent_grid.log"
2013-09-03 19:53:05.430
[/opt/app/11.2.0.3/grid/bin/oraagent.bin(16777322)]CRS-5019:All OCR locations are on ASM disk groups [DATA], and none of these disk groups are mounted. Details are at "(:CLSN00100:)" in "/opt/app/11.2.0.3/grid/log/ggnetp04/agent/ohasd/oraagent_grid/oraagent_grid.log".
2013-09-03 19:53:05.539
[/opt/app/11.2.0.3/grid/bin/oraagent.bin(16777322)]CRS-5019:All OCR locations are on ASM disk groups [DATA], and none of these disk groups are mounted. Details are at "(:CLSN00100:)" in "/opt/app/11.2.0.3/grid/log/ggnetp04/agent/ohasd/oraagent_grid/oraagent_grid.log".
2013-09-03 19:53:05.815
[/opt/app/11.2.0.3/grid/bin/oraagent.bin(16777322)]CRS-5019:All OCR locations are on ASM disk groups [DATA], and none of these disk groups are mounted. Details are at "(:CLSN00100:)" in "/opt/app/11.2.0.3/grid/log/ggnetp04/agent/ohasd/oraagent_grid/oraagent_grid.log".
2013-09-03 19:55:07.436
[cssd(17694820)]CRS-1662:Member kill requested by node ggnetp03 for member number 1, group DB+ASM
2013-09-03 19:55:09.673
[/opt/app/11.2.0.3/grid/bin/oraagent.bin(16777322)]CRS-5019:All OCR locations are on ASM disk groups [DATA], and none of these disk groups are mounted. Details are at "(:CLSN00100:)" in "/opt/app/11.2.0.3/grid/log/ggnetp04/agent/ohasd/oraagent_grid/oraagent_grid.log".
2013-09-03 19:55:09.674
[/opt/app/11.2.0.3/grid/bin/oraagent.bin(16777322)]CRS-5011:Check of resource "+ASM" failed: details at "(:CLSN00006:)" in "/opt/app/11.2.0.3/grid/log/ggnetp04/agent/ohasd/oraagent_grid/oraagent_grid.log"
2013-09-03 19:55:12.007
[/opt/app/11.2.0.3/grid/bin/oraagent.bin(16777322)]CRS-5019:All OCR locations are on ASM disk groups [DATA], and none of these disk groups are mounted. Details are at "(:CLSN00100:)" in "/opt/app/11.2.0.3/grid/log/ggnetp04/agent/ohasd/oraagent_grid/oraagent_grid.log".
2013-09-03 19:55:12.115
[/opt/app/11.2.0.3/grid/bin/oraagent.bin(16777322)]CRS-5019:All OCR locations are on ASM disk groups [DATA], and none of these disk groups are mounted. Details are at "(:CLSN00100:)" in "/opt/app/11.2.0.3/grid/log/ggnetp04/agent/ohasd/oraagent_grid/oraagent_grid.log".
2013-09-03 19:55:12.389
[/opt/app/11.2.0.3/grid/bin/oraagent.bin(16777322)]CRS-5019:All OCR locations are on ASM disk groups [DATA], and none of these disk groups are mounted. Details are at "(:CLSN00100:)" in "/opt/app/11.2.0.3/grid/log/ggnetp04/agent/ohasd/oraagent_grid/oraagent_grid.log".
2013-09-03 19:55:12.405
[ohasd(13697160)]CRS-2807:Resource 'ora.asm' failed to start automatically.
2013-09-03 19:55:12.405
[ohasd(13697160)]CRS-2807:Resource 'ora.crsd' failed to start automatically.
2013-09-03 20:23:32.040
[ctssd(18022612)]CRS-2409:The clock on host ggnetp04 is not synchronous with the mean cluster time. No action has been taken as the Cluster Time Synchronization Service is running in observer mode. -
How to clone a 11.1.0.7 oracle single node db with asm instance
We need to clone a 11.1.0.7 environment with single node db plus asm storage used.
I googled everywhere , and a lot notes on ASM with RAC cluster clone provided but no document for ASM with single node.
Please help.
Thanks9233598 wrote:
We need to clone a 11.1.0.7 environment with single node db plus asm storage used.
I googled everywhere , and a lot notes on ASM with RAC cluster clone provided but no document for ASM with single node.
Please help.
Thanks
9233598 wrote:
We need to clone a 11.1.0.7 environment with single node db plus asm storage used.
I googled everywhere , and a lot notes on ASM with RAC cluster clone provided but no document for ASM with single node.
Please help.
Thanks
RMAN> DUPLICATE DATABASE -
Hi,
My OCR got corrupted and I am not able to recover as I don't have backup of that. Because of this, CRS daemon is not coming up and this leads me to clean up this cluster and build it again. I am not much worried as this is my second development env.
I want to drop the disk groups but I am not able to do because those are not being mounted.
SQL> select name from v$asm_diskgroup;
NAME
DG1
RECOVERYDEST
SQL> drop diskgroup DG1 including contents;
drop diskgroup DG1 including contents
ERROR at line 1:
ORA-15039: diskgroup not dropped
ORA-15001: diskgroup "DG1" does not exist or is not mounted
If I do remove ASM using DBCA, will all diskgroups be removed or do I need to perform any cleanup?
Thanks,Thanks Vishwa,
Here is the output,
$ ps -aef|grep d.bin
oracle 5234 5215 0 18:37 ? 00:00:00 /u01/app/oracle/product/10.2.0/crs_1/bin/evmd.bin
oracle 5330 5329 0 18:37 ? 00:00:00 /u01/app/oracle/product/10.2.0/crs_1/bin/ocssd.bin
oracle 7646 7191 0 18:39 pts/1 00:00:00 grep d.bin
$ crs_stat -t
CRS-0184: Cannot communicate with the CRS daemon.
When I do mount the DG1 diskgroup I am getting below error on all nodes,
SQL> startup
ASM instance started
Total System Global Area 92274688 bytes
Fixed Size 1217884 bytes
Variable Size 65890980 bytes
ASM Cache 25165824 bytes
ORA-15032: not all alterations performed
ORA-15130: diskgroup "DG1" is being dismounted
ORA-15066: offlining disk "DG1_0000" may result in a data loss
SQL> alter diskgroup DG1 mount;
alter diskgroup DG1 mount
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15130: diskgroup "DG1" is being dismounted
ORA-15066: offlining disk "DG1_0000" may result in a data loss
Ashok: As far as I know, OCR stores the information about Oracle clusterware controls and if it is not up then clusterware controls won't come up. My crsd daemon is not comming up (even though If I try manually to bring it up) and this daemon is directly liked up with OCR. Does it mean that if this daemon is not up then it won't allow O/S to access OCR? Even If I try to take backup using ocrconfig -export ..it throws an error.
As I don't have backup of OCR, I need to drop the database and uninstall just Oracle clusterware and re-install and create the database. I want to clean up the disk headers as I want to use those to build diskgroup again, do you guys have any idea, how to do that?
Do let me know if you have different view on this.
Thanks. -
Can there be multiple ASM instances on single node?
Hi,
Can there be multiple ASM instances on single node?
This one says No : http://www.freelists.org/archives/oracle-l/02-2008/msg00317.html
And This one says Yes : http://www.databasejournal.com/features/oracle/article.php/3571371
Thanks in advance.
Thanks,
Harsha
Edited by: user498756 on Sep 11, 2008 2:23 AM...that document doesnt say you cannot have multiple ASM instances on a node. It says "...ASM, +you only need one ASM+ instance for that computer, to manage the two database instances that use ASM."
The fact that you only need one - and I cannot think of a good reason to have more than one - does not preclude the fact that you do seem to be able to have multiple ASM instances on a single node, each looking after its own set of disks and diskgroups.
Again - I cannot think of a good reason to do so though!
-Bob -
ASM instance on one node can not startup
use dbca create database failure
[oracle@rac1 ~]$ dbca -silent -responseFile /home/oracle/dbca.rsp
Look at the log file "/opt/ora/product/10.2.0/db_1/cfgtoollogs/dbca/mydb.log" for further details.
[oracle@rac1 ~]$ cat "/opt/ora/product/10.2.0/db_1/cfgtoollogs/dbca/mydb.log"
PRKS-1009 : Failed to start ASM instance "+ASM2" on node "rac2", [CRS-0215: Could not start resource 'ora.rac2.ASM2.asm'.]
ORA-03135: connection lost contact
[oracle@rac2 bin]$ ./crs_stat -t
Name Type Target State Host
ora....SM1.asm application ONLINE ONLINE rac1
ora....C1.lsnr application ONLINE ONLINE rac1
ora.rac1.gsd application ONLINE ONLINE rac1
ora.rac1.ons application ONLINE ONLINE rac1
ora.rac1.vip application ONLINE ONLINE rac1
ora....SM2.asm application ONLINE OFFLINE
ora....C2.lsnr application ONLINE ONLINE rac2
ora.rac2.gsd application ONLINE ONLINE rac2
ora.rac2.ons application ONLINE ONLINE rac2
ora.rac2.vip application ONLINE ONLINE rac2so i try to start asm instance on rac2
[oracle@rac2 bin]$ ./srvctl start asm -n rac2
PRKS-1009 : Failed to start ASM instance "+ASM2" on node "rac2", [PRKS-1009 : Failed to start ASM instance "+ASM2" on node "rac2", [rac2:ora.rac2.ASM2.asm:
rac2:ora.rac2.ASM2.asm:SQL*Plus: Release 10.2.0.1.0 - Production on Mon Jul 25 17:58:21 2011
rac2:ora.rac2.ASM2.asm:
rac2:ora.rac2.ASM2.asm:Copyright (c) 1982, 2005, Oracle. All rights reserved.
rac2:ora.rac2.ASM2.asm:
rac2:ora.rac2.ASM2.asm:Enter user-name: Connected to an idle instance.
rac2:ora.rac2.ASM2.asm:
rac2:ora.rac2.ASM2.asm:SQL> ORA-03113: end-of-file on communication channel
rac2:ora.rac2.ASM2.asm:SQL> Disconnected
rac2:ora.rac2.ASM2.asm:
CRS-0215: Could not start resource 'ora.rac2.ASM2.asm'.]]
[PRKS-1009 : Failed to start ASM instance "+ASM2" on node "rac2", [rac2:ora.rac2.ASM2.asm:
rac2:ora.rac2.ASM2.asm:SQL*Plus: Release 10.2.0.1.0 - Production on Mon Jul 25 17:58:21 2011
rac2:ora.rac2.ASM2.asm:
rac2:ora.rac2.ASM2.asm:Copyright (c) 1982, 2005, Oracle. All rights reserved.
rac2:ora.rac2.ASM2.asm:
rac2:ora.rac2.ASM2.asm:Enter user-name: Connected to an idle instance.
rac2:ora.rac2.ASM2.asm:
rac2:ora.rac2.ASM2.asm:SQL> ORA-03113: end-of-file on communication channel
rac2:ora.rac2.ASM2.asm:SQL> Disconnected
rac2:ora.rac2.ASM2.asm:check the alert log find
Mon Jul 25 17:58:23 2011
Maximum Tranmission Unit (mtu) of the ether adapter is different
on the node running instance 1, and this node.
Ether adapters connecting the cluster nodes must be configured
with identical mtu on all the nodes, for Oracle.
Please ensure the mtu attribute of the ether adapter on all
nodes are identical, before running Oracle.
Mon Jul 25 17:58:23 2011
Errors in file /opt/ora/admin/+ASM/bdump/+asm2_lmon_29711.trc:
ORA-27550: Target ID protocol check failed. tid vers=%d, type=%d, remote instance number=%d, local instance number=%d
LMON: terminating instance due to error 27550
Mon Jul 25 17:58:25 2011
Shutting down instance (abort)
License high water mark = 0
Mon Jul 25 17:58:28 2011
Instance terminated by LMON, pid = 29711
Mon Jul 25 17:58:30 2011
Instance terminated by USER, pid = 29831and i checked my eth
[root@rac1 oracle]# ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:0C:29:3C:42:0C
inet addr:192.168.40.102 Bcast:192.168.40.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:9762 errors:0 dropped:0 overruns:0 frame:0
TX packets:6028 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1193646 (1.1 MiB) TX bytes:1037252 (1012.9 KiB)
Interrupt:67 Base address:0x2400
eth0:1 Link encap:Ethernet HWaddr 00:0C:29:3C:42:0C
inet addr:192.168.40.201 Bcast:192.168.40.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:67 Base address:0x2400
eth1 Link encap:Ethernet HWaddr 00:0C:29:3C:42:16
inet addr:10.10.17.221 Bcast:10.10.17.225 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:30185 errors:0 dropped:0 overruns:0 frame:0
TX packets:37936 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:19988844 (19.0 MiB) TX bytes:35126056 (33.4 MiB)
Interrupt:51 Base address:0x2480
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:52537 errors:0 dropped:0 overruns:0 frame:0
TX packets:52537 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:4380651 (4.1 MiB) TX bytes:4380651 (4.1 MiB)
[root@rac2 ~]# ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:0C:29:9C:CC:90
inet addr:192.168.40.103 Bcast:192.168.40.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3665 errors:0 dropped:0 overruns:0 frame:0
TX packets:1489 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:563952 (550.7 KiB) TX bytes:243127 (237.4 KiB)
Interrupt:67 Base address:0x2400
eth0:1 Link encap:Ethernet HWaddr 00:0C:29:9C:CC:90
inet addr:192.168.40.202 Bcast:192.168.40.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:67 Base address:0x2400
eth1 Link encap:Ethernet HWaddr 00:0C:29:9C:CC:9A
inet addr:10.10.17.222 Bcast:10.10.17.225 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:38281 errors:0 dropped:0 overruns:0 frame:0
TX packets:29683 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:35182270 (33.5 MiB) TX bytes:19905266 (18.9 MiB)
Interrupt:51 Base address:0x2480
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:44387 errors:0 dropped:0 overruns:0 frame:0
TX packets:44387 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2299383 (2.1 MiB) TX bytes:2299383 (2.1 MiB)any idea ?
i try to run dbca on rac2 ,it seems OK
============
ASM instance still have problem,no ASM instance create in rac1
[oracle@rac2 bin]$ ./crs_stat -t
Name Type Target State Host
ora.mydb.db application ONLINE ONLINE rac1
ora....b1.inst application ONLINE OFFLINE
ora....b2.inst application ONLINE ONLINE rac2
ora....SM1.asm application ONLINE OFFLINE
ora....C1.lsnr application ONLINE ONLINE rac1
ora....C2.lsnr application ONLINE OFFLINE => ora.rac1.LISTENER_RAC2.lsnr (i do not know where this resource come from ??)
ora.rac1.gsd application ONLINE ONLINE rac1
ora.rac1.ons application ONLINE ONLINE rac1
ora.rac1.vip application ONLINE ONLINE rac1
ora....SM2.asm application ONLINE ONLINE rac2
ora....C2.lsnr application ONLINE ONLINE rac2
ora.rac2.gsd application ONLINE ONLINE rac2
ora.rac2.ons application ONLINE ONLINE rac2
ora.rac2.vip application ONLINE ONLINE rac2and here is my dbca.rsp file content
[GENERAL]
RESPONSEFILE_VERSION = "10.0.0"
OPERATION_TYPE = "createDatabase"
[CREATEDATABASE]
GDBNAME = "mydb.us.oracle.com"
SID = "mydb"
NODELIST=rac1,rac2
TEMPLATENAME = "/home/oracle/mydb.dbc"
SYSPASSWORD = "Myss123456"
SYSTEMPASSWORD = "Myss123456"
EMCONFIGURATION = "NONE"
DBSNMPPASSWORD = "Myss123456"
STORAGETYPE=ASM
DISKLIST=/dev/oracleasm/disks/VOL1,/dev/oracleasm/disks/VOL2
DISKGROUPNAME=ORADG
REDUNDANCY=EXTRENAL
DISKSTRING="/dev/oracleasm/disks/*"
ASM_SYS_PASSWORD="Myss123456"
LISTENERS = "listener1 listener2"Edited by: 859340 on 2011-7-24 下午7:23
Edited by: 859340 on 2011-7-24 下午7:32
Edited by: 859340 on 2011-7-24 下午7:35
Edited by: 859340 on 2011-7-24 下午7:51Hi,
Use this tech note on MOS.
*Instance Crash on startup with ORA-27550: Target ID protocol check failed [ID 730516.1]*
Regards,
Levi Pereira -
ASM instances on 2 node Oracle RAC 10g r2 on Red Hat 4 u1
Hi all
I'm experiencing a problem in configuring diskgroups under +ASM instances on a two node Oracle RAC.
I followed the official guide and also official documents from metalink site, but i'm stuck with the visibility of asm disks.
I created fake disks on nfs with Netapp certified storage binding them to block device with the usual trick "losetup /dev/loopX /nfs/disk1 " ,
run "oracleasm createdisk DISKX /dev/loopX" on one node and
"oracleasm scandisks" on the other one.
With "oracleasm listdisks" i can see the disks at OS level in both nodes , but , when i try to create and mount diskgroup in the ASM instances , on the instance on which i create the diskgroup all is well, but the other one doesn't see the disks at all, and diskgroup mount fails with :
ERROR: no PST quorum in group 1: required 2, found 0
Tue Sep 20 16:22:32 2005
NOTE: cache dismounting group 1/0x6F88595E (DG1)
NOTE: dbwr not being msg'd to dismount
ERROR: diskgroup DG1 was not mounted
any help would be appreciated
thanks a lot.
AntonelloI'm having this same problem. Did you ever find a solution?
-
Multiple ASM instances on a single node
Can i have multiple ASM instances on a single node? This is to have each instance supporting different environment dev,stage etc
Thanks
SannidhiI had been discussing the same issue with someone from Oracle. I asked for multiple ASMs on a server so that we could have seperate ASMs running for, say, 10g and 11g.
He explained that we should think of ASM as being the same as Veritas FileSystem. We don't run multiple instances of Veritas on our servers. On single Veritas "instance" (set of drivers) provides all the Veritas Fx mountpoints on the server. Similarly, there should be only 1 ASM instance on a server.
(substitute UFS or ZFS or CFS for Veritas in the above example and you still have only 1 filesystem manager on a server providing one type of filesystem, although you could have, say , UFS and Veritas co-exist ; just as you could have Veritas, ASM and Raw co-exist on a server).
Hemant K Chitale
Edited by: Hemant K Chitale on Sep 29, 2009 11:50 AM -
Multiple ASM Instances on single node
Hi All,
After going through some threads it seems to me that multiple ASM instances on a node is not supported and recommended by ORACLE but i coudn't find any ORACLE document or support matrix mentioning this. Can any one give me a pointer to this. Please correct me if i am wrong and Multiple ASM instances are fully supported by ORACLE.
Thanks,Multiple ASM instances on a single node are supported but not recommended due to several issues you could encounter during that kind of configuration.
Possible interraction between those instances for identification of each disk area usage,each disk area permissions , database instance to asm instance mapping and so on, could result in unwanted behaviour, as ASM is in some way just oracle's representation of LVM.
Intention is that any kind of distinction/separation of oracle related data under the ASM should be done through the disk groups.
So it seems it would be better to apply this kind of logic rather than doing suspiciously magical and rare configurations that could bring you similiary strange and unexpected problems. -
How does 1 ASM instance in a 10 node RAC cause all 10 ASM instance to hang
Linux RHEL4
11.2.0.1.0 GI
11.2.0.1.0 RDBMS
11.1.0.7.0 RDBMS
10.2.0.4.4 RDBMS
Yesterday we had one of the ASM instance on our 10-node cluster hang with a latch "ASM file allocation latch". Oracle support has stated we are hitting a bug with is fixed in the latest PSU.
What I am trying to understand is how a latch on one ASM instance caused all 10 ASM instances to hang?
Oracle Supports explanation still does not answer how all 10 ASM instance were affected other then the faulty code that the patch fixes. Bellow is info out of the SAR.
Data Guard Site:
================
ARC1 PID 21508 reports ORA-240 'control file enqueue held for more than 120 seconds' at Thu Oct 28 11:35:54 2010. This message means ARC1 PID 21508 was holding the enqueue past the maximum tine limit of 120 seconds.
Next ARC0 PID 17398 reports ORA-16146: 'control file enqueue unavailable' at Thu Oct 28 11:36:52 2010. This means ARC0 PID 17398 tried to access the controlfile and it could get the lock.
ARC1 PID 21508 is then killed at Thu Oct 28 11:49:57 2010.
Killing enqueue blocker (pid=21508) on resource CF-00000000-00000000 by (pid=23078) by killing session 5.3
We see that RSM has been restarted by Broker. This matches to the alert.log and messages showing RSM being restarted several time. i.e. RSM0 started with pid=84, OS id=27915
Since this started happening around 11:14, the problem may have really started then instead of w/ the CF enqueue block.
The primary appears to be shipping redo to the standby using asynchronous mode. Unless there was a gap, I do no know if ARC1 should have been doing any remote network I/O. Because a log switch to thread 1 sequence 5235 had just happened at 11:33am, I suspect it was a local disk I/O that was started at least. The ORA-240 is reported at 11:35, exactly 120 sec (or 2min) from this log switch. Notice also the entry to show the log thread 1 sequence 5234 was registered to the controlfile didn't happen yet.
ASM Side:
============
From the systemstate dump on ASM, multiple processes are waiting on 'ASM file allocation latch' and we are kind of stuck on stack:
ksedsts()+461<-ksdxfstk()+32<-ksdxcb()+1782<-sspuser()+112<-0000003218E0C5B0<-kfuhInsert()+175<-kffilCreate()+601<-kfnsUFG()+3691<-kfnsBackground()+4382<-kfnDispatch()+527<-opiodr()+1149<-ttcpip()+1251<-opitsk()+1633<-opiino()+958<-opiodr()+1149<-opidrv()+570<-sou2o()+103<-opimai_real()+133<-ssthrdmain()+214<-main()+201<-__libc_start_main()+219
This caused the hang on the ASM side and hence ASM was not responding to the database. The CF Enqueue issue on the database was a side effect of this.
This is a direct <BUG:9232266> which is a duplicate of <BUG:8974548>Thanks Murali,
I was little reluctent to open a tar since my experince says that its better to troubleshoot the issue yourself instead of spending time with the Oracle support :)
Well, I got some more information on this : the sql for the process id of ASM instance is :
Alter Diskgroup mount all;
It looks like it is unable to mount the diskgroup and get hunged at that point , is it due to the new disk added to the system or do we missed something after adding the new disk.
Also, the ASM process can not be killed from unix box while the ASM is down.
Will appreciate your time if we can move in any directions from here ..
Thanks ,
Ankur -
Unable to recreate ASM instance in 10g rac (2 node )
Hi,
I have successfully installed the clusterware and database software.during ASM installation it got failed, i i have cleaned up ASM setup.
Now i am not able to create asm instance it show following message
PRKS-1011:Failed to check status of ASM instance "+ASM1" on node "rac1",[
CRS-0210:Could not find resource ora.rac1.ASM1.asm
here are few output of commands and activity done
[oracle@rac1 ~]$ crs_stat -t
Name Type Target State Host
ora....C1.lsnr application ONLINE ONLINE rac1
ora.rac1.gsd application ONLINE ONLINE rac1
ora.rac1.ons application ONLINE ONLINE rac1
ora.rac1.vip application ONLINE ONLINE rac1
ora....C2.lsnr application ONLINE ONLINE rac2
ora.rac2.gsd application ONLINE ONLINE rac2
ora.rac2.ons application ONLINE ONLINE rac2
ora.rac2.vip application ONLINE ONLINE rac2
[oracle@rac1 ~]$
[oracle@rac1 ~]$ crs_profile -validate ora.rac1.ASM1.asm
CRS-0181: Cannot access the resource profile '/u01/app/oracle/product/10.2.0/crs_1/crs/public/ora.rac1.ASM1.asm.cap'.
CRS-0180: Resource '/u01/app/oracle/product/10.2.0/crs_1/crs/public/ora.rac1.ASM1.asm.cap' validation failed.
[oracle@rac1 ~]$ crs_profile -validate ora.rac2.ASM2.asm
CRS-0181: Cannot access the resource profile '/u01/app/oracle/product/10.2.0/crs_1/crs/public/ora.rac2.ASM2.asm.cap'.
CRS-0180: Resource '/u01/app/oracle/product/10.2.0/crs_1/crs/public/ora.rac2.ASM2.asm.cap' validation failed.
[oracle@rac1 ~]$
[oracle@rac1 ~]$
[oracle@rac1 ~]$ crs_unregister ora.rac1.ASM1.asm
CRS-0210: Could not find resource 'ora.rac1.ASM1.asm'.
[oracle@rac1 ~]$ crs_unregister ora.rac2.ASM2.asm
CRS-0210: Could not find resource 'ora.rac2.ASM2.asm'.
I Have deleted following files
rm -Rf $ORACLE_BASE/admin/+ASM
rm -Rf $ORACLE_HOME/dbs/*ASM*
[oracle@rac1 ~]$ rm -Rf $ORACLE_HOME/dbs/*ASM*
[oracle@rac1 ~]$ rm -Rf $ORACLE_BASE/admin/+ASM
[oracle@rac1 ~]$ ssh rac2
Last login: Thu Feb 23 16:31:26 2012 from rac1.mylinux.localdomain
[oracle@rac2 ~]$ rm -Rf $ORACLE_BASE/admin/+ASM
[oracle@rac2 ~]$ rm -Rf $ORACLE_HOME/dbs/*ASM*
dbca -silent -deleteASM -nodelist rac1,rac2 -----AS per oracle DOC
Also removed entries from oratab file for ASM instances.
Dbca error message during asm instance creation for both node
PRKS-1011:Failed to check status of ASM instance "+ASM1" on node "rac1",[
CRS-0210:Could not find resource ora.rac1.ASM1.asm
PRKS-1011:Failed to check status of ASM instance "+ASM2" on node "rac2",[
CRS-0210:Could not find resource ora.rac2.ASM2.asm
Did i forget to remove entries for ASM instance somewhere.
Please help me.Hi,
I believe your OCR is corrupted....so restore the OCR from most recent backup (before error ).
Using crs_* commands on resources with the prefix ora.* (resources provided by Oracle) remains unsupported.
After restore OCR... remove ASM with "srvctl" command:
http://docs.oracle.com/cd/B19306_01/rac.102/b14197/srvctladmin.htm#CHDBDDAD
Regards,
Levi Pereira -
Failed to start ASM instance "+ASM1" on node "rac1"
I have a problem, because when I start RAC and write command crs_stat -t
column State have 2 wrong parameter..
Name Type Target State Host
ora.....CRM.cs application ONLINE ONLINE rac2
ora....db1.srv application ONLINE ONLINE rac2
ora.devdb.db application ONLINE ONLINE rac2
ora....b1.inst application ONLINE OFFLINE
ora....b2.inst application ONLINE ONLINE rac2
ora....SM1.asm application ONLINE UNKNOWN rac1
ora....C1.lsnr application ONLINE ONLINE rac1
ora.rac1.gsd application ONLINE ONLINE rac1
ora.rac1.ons application ONLINE ONLINE rac1
ora.rac1.vip application ONLINE ONLINE rac1
ora....SM2.asm application ONLINE ONLINE rac2
ora....C2.lsnr application ONLINE ONLINE rac2
ora.rac2.gsd application ONLINE ONLINE rac2
ora.rac2.ons application ONLINE ONLINE rac2
ora.rac2.vip application ONLINE ONLINE rac2
When I try
srvctl start asm -n rac1 then is wrong:
PRKS-1009 : Failed to start ASM instance "+ASM1" on node "rac1", [PRKS-1009 : Failed to start ASM instance "+ASM1" on node "rac1", [CRS-1028: Dependency analysis failed because of:
CRS-0223: Resource 'ora.rac1.ASM1.asm' has placement error.]]
[PRKS-1009 : Failed to start ASM instance "+ASM1" on node "rac1", [CRS-1028: Dependency analysis failed because of:
CRS-0223: Resource 'ora.rac1.ASM1.asm' has placement error.]]
and when I try start instance manualy then
PRKP-1001 : Error starting instance devdb1 on node rac1
CRS-1028: Dependency analysis failed because of:
CRS-0223: Resource 'ora.devdb.devdb1.inst' has placement error.
:( Where is my problem??hi, i have exactly the same error
but your suggestions of remove an recreate the asm resource not working
./srvctl remove asm -n dbs2 -i +ASM2 -f
PRKS-1023 : Failed to remove CRS resource for ASM instance "+ASM2" on node "dbs2", [CRS-0214: Could not unregister resource 'ora.dbs2.ASM2.asm'.]
./srvctl start asm -n dbs2
PRKS-1009 : Failed to start ASM instance "+ASM2" on node "dbs2", [PRKS-1009 : Failed to start ASM instance "+ASM2" on node "dbs2", [CRS-1028: Dependency analysis failed because of:
CRS-0223: Resource 'ora.dbs2.ASM2.asm' has placement error.]]
[PRKS-1009 : Failed to start ASM instance "+ASM2" on node "dbs2", [CRS-1028: Dependency analysis failed because of:
CRS-0223: Resource 'ora.dbs2.ASM2.asm' has placement error.]]
how do i proceed?
iam using solaris 10 with t2000 and t5210 server and oracle 10.2.0.4 -
HELP !! only one ASM instance up at any given time on a 2 node RAC cluster
OS: Solaris 10
Oracle: 10.2.0.4
Problem: Installing ASM, dbca hangs, and errors out with End of communication channel.
Only one ASM instance can be brought up at any given time
PLEASE HELP !!!!
- nkalert log
======
Thu Oct 1 23:09:54 2009
lmon registered with NM - instance id 1 (internal mem no 0)
Thu Oct 1 23:09:54 2009
Reconfiguration started (old inc 0, new inc 12)
ASM instance
List of nodes:
0 1
Global Resource Directory frozen
Communication channels reestablished
Thu Oct 1 23:24:59 2009
Errors in file /oracle/admin/+ASM/bdump/+asm1_lmon_1999.trc:
ORA-00481: LMON process terminated with error
Thu Oct 1 23:24:59 2009
LMON: terminating instance due to error 481
Thu Oct 1 23:24:59 2009
System state dump is made for local instance
Thu Oct 1 23:24:59 2009
Trace dumping is performing id=[cdmp_20091001232459]
Thu Oct 1 23:25:00 2009
Instance terminated by LMON, pid = 1999
Thu Oct 1 23:25:03 2009
Starting ORACLE instance (normal)
LICENSE_MAX_SESSION = 0
LICENSE_SESSIONS_WARNING = 0
Interface type 1 bge1 192.168.10.0 configured from OCR for use as a cluster interconnect
Interface type 1 bge0 10.134.246.32 configured from OCR for use as a public interface
Picked latch-free SCN scheme 3
Using LOG_ARCHIVE_DEST_1 parameter default value as /oracle/product/10.2.0/db_1/dbs/arch
Autotune of undo retention is turned off.
LICENSE_MAX_USERS = 0
SYS auditing is disabled
ksdpec: called for event 13740 prior to event group initialization
Starting up ORACLE RDBMS Version: 10.2.0.4.0.
System parameters with non-default values:
large_pool_size = 12582912
instance_type = asm
cluster_database = TRUE
instance_number = 1
remote_login_passwordfile= EXCLUSIVE
background_dump_dest = /oracle/admin/+ASM/bdump
user_dump_dest = /oracle/admin/+ASM/udump
core_dump_dest = /oracle/admin/+ASM/cdump
asm_diskgroups =
Cluster communication is configured to use the following interface(s) for this instance
192.168.10.1
Thu Oct 1 23:25:03 2009
cluster interconnect IPC version:Oracle UDP/IP (generic)
IPC Vendor 1 proto 2
PMON started with pid=2, OS id=17923
DIAG started with pid=3, OS id=17925
PSP0 started with pid=4, OS id=17927
LMON started with pid=5, OS id=17929
LMD0 started with pid=6, OS id=17931
LMS0 started with pid=7, OS id=17933
MMAN started with pid=8, OS id=17937
DBW0 started with pid=9, OS id=17939
LGWR started with pid=10, OS id=17941
CKPT started with pid=11, OS id=17943
SMON started with pid=12, OS id=17945
RBAL started with pid=13, OS id=17955
GMON started with pid=14, OS id=17957
Thu Oct 1 23:25:04 2009
lmon registered with NM - instance id 1 (internal mem no 0)
Thu Oct 1 23:25:04 2009
Reconfiguration started (old inc 0, new inc 14)
ASM instance
List of nodes:
0 1
Global Resource Directory frozen
Communication channels reestablished
Thu Oct 1 23:40:09 2009
Errors in file /oracle/admin/+ASM/bdump/+asm1_lmon_17929.trc:
ORA-00481: LMON process terminated with error
Thu Oct 1 23:40:09 2009
LMON: terminating instance due to error 481
Thu Oct 1 23:40:09 2009
System state dump is made for local instance
Thu Oct 1 23:40:09 2009
Trace dumping is performing id=[cdmp_20091001234009]
Thu Oct 1 23:40:10 2009
Instance terminated by LMON, pid = 17929
Thu Oct 1 23:40:12 2009
Starting ORACLE instance (normal)
LICENSE_MAX_SESSION = 0
LICENSE_SESSIONS_WARNING = 0
Interface type 1 bge1 192.168.10.0 configured from OCR for use as a cluster interconnect
Interface type 1 bge0 10.134.246.32 configured from OCR for use as a public interface
Picked latch-free SCN scheme 3
Using LOG_ARCHIVE_DEST_1 parameter default value as /oracle/product/10.2.0/db_1/dbs/arch
Autotune of undo retention is turned off.
LICENSE_MAX_USERS = 0
SYS auditing is disabled
ksdpec: called for event 13740 prior to event group initialization
Starting up ORACLE RDBMS Version: 10.2.0.4.0.
System parameters with non-default values:
large_pool_size = 12582912
instance_type = asm
cluster_database = TRUE
instance_number = 1
remote_login_passwordfile= EXCLUSIVE
background_dump_dest = /oracle/admin/+ASM/bdump
user_dump_dest = /oracle/admin/+ASM/udump
core_dump_dest = /oracle/admin/+ASM/cdump
asm_diskgroups =
Cluster communication is configured to use the following interface(s) for this instance
192.168.10.1
Thu Oct 1 23:40:13 2009
cluster interconnect IPC version:Oracle UDP/IP (generic)
IPC Vendor 1 proto 2
PMON started with pid=2, OS id=26086
DIAG started with pid=3, OS id=26088
PSP0 started with pid=4, OS id=26090
LMON started with pid=5, OS id=26092
LMD0 started with pid=6, OS id=26094
LMS0 started with pid=7, OS id=26096
MMAN started with pid=8, OS id=26100
DBW0 started with pid=9, OS id=26102
LGWR started with pid=10, OS id=26112
CKPT started with pid=11, OS id=26114
SMON started with pid=12, OS id=26116
RBAL started with pid=13, OS id=26118
GMON started with pid=14, OS id=26120
Thu Oct 1 23:40:13 2009
lmon registered with NM - instance id 1 (internal mem no 0)
Thu Oct 1 23:40:14 2009
Reconfiguration started (old inc 0, new inc 16)
ASM instance
List of nodes:
0 1
Global Resource Directory frozen
Communication channels reestablished -
Asm, instance and service failing to start 10g rac redhat el5
hi,
i have been following a how to guide from oracle's website about implementing a 10g rac system using el5 (http://www.oracle.com/technology/pub/articles/hunter_rac10gr2_iscsi.html), by the end of the installation and setup I had both the nodes up and running and all services were up and running. Then under the root account I rebooted one of the nodes. now when I check the status of the services I get this:
[oracle@rac01 ~]$ crs_stat -t
Name Type Target State Host
ora.orcl.db application ONLINE ONLINE rac01
ora...._taf.cs application ONLINE ONLINE rac02
ora....cl1.srv application ONLINE OFFLINE
ora....cl2.srv application ONLINE ONLINE rac02
ora....l1.inst application OFFLINE OFFLINE
ora....l2.inst application ONLINE ONLINE rac02
ora....SM1.asm application OFFLINE OFFLINE
ora....01.lsnr application ONLINE ONLINE rac01
ora.rac01.gsd application ONLINE ONLINE rac01
ora.rac01.ons application ONLINE ONLINE rac01
ora.rac01.vip application ONLINE ONLINE rac01
ora....SM2.asm application ONLINE ONLINE rac02
ora....02.lsnr application ONLINE ONLINE rac02
ora.rac02.gsd application ONLINE ONLINE rac02
ora.rac02.ons application ONLINE ONLINE rac02
ora.rac02.vip application ONLINE ONLINE rac02though I can start the asm instance manually by
srvctl start asm -n rac01and it starts but the instance and service on the rebooted node still wont start. is there a log file which tells me what the error is when it tries to start the instance? what can I do to ensure that if a node is rebooted that all of the services get started correctly and the node automatically rejoins the cluster (i thought I had set all of this from the instructions of the guide I was following).
Regards
Martin.Check ASM resource:
crs_stat -p "resource_name
$ crs_stat | grep NAME\= | grep ASM1
NAME=ora.rac01.ASM1.asm
$ crs_stat -p ora.rac01.ASM1.asm
NAME=ora.rac01.ASM1.asm
TYPE=application
ACTIVE_PLACEMENT=0
*AUTO_START*=1
CHECK_INTERVAL=600
DESCRIPTION=CRS application for ASM instance
What do you see AUTO_START?
if 1 = auto start:
or check error ASM while start... at ASM_HOME/log/rac01/racg/*
If AUTO_START=2
Oracle Clusterware is configured to start the VIP, listener, instance, ASM, database services and other resources during system boot. Starting with 10.1.0.4, it is possible to modify some resources to have their profile parameter AUTO_START set to the value 2. This means that after node reboot, or when Oracle Clusterware is started, resources with AUTO_START=2 will need to be started manually via srvctl. Please work with Oracle Support if you need to modify this attribute.
If AUTO_START=2 and need to change to 1:
Example:
$ crs_stat -p ora.rac01.ASM1.asm
NAME=ora.rac01.ASM1.asm
TYPE=application
ACTIVE_PLACEMENT=0
AUTO_START=2
$ crs_stat -p ora.rac01.ASM1.asm > ORA_CRS_HOME/crs/public/ora.rac01.ASM1.asm
$ crs_unregister ora.rac01.ASM1.asm
$ crs_stat -p ora.rac01.ASM1.asm
CRS-0210: Could not find resource 'ora.rac01.ASM1.asm
$ vi ORA_CRS_HOME/crs/public/ora.rac01.ASM1.asm.cap
AUTO_START=2
to
AUTO_START=1
$ crs_register ora.rac01.ASM1.asm
$ crs_stat -p ora.rac01.ASM1.asm
NAME=ora.rac01.ASM1.asm
TYPE=application
*AUTO_START=1*
Edited by: Surachart Opun (HunterX) on Jul 31, 2009 1:06 PM -
ORA-15077: could not locate ASM instance serving a required diskgroup
My cluster is gone...
due to restart of the network, the cluster fenced node2 from my configuration. Since the evicting, the cluster is not starting any more.
ocrcheck
PROT-602: Failed to retrieve data from the cluster registry
PROC-26: Error while accessing the physical storage
ORA-15077: could not locate ASM instance serving a required diskgroup
The OCR Disks are within ASM.
Oracleasm does see the disks
crsctl query css votedisk is also giving the correct information about the votingsdisks which are also in the same OCR diskgroup
crsctl query css votedisk
## STATE File Universal Id File Name Disk group
1. ONLINE 0eb6aaa85e5c4fd6bf9d0481cfd7d517 (ORCL:VOTE1) [OCR]
2. ONLINE 5a66449fbada4f34bf0c3be4574f03bc (ORCL:VOTE2) [OCR]
3. ONLINE 76ad295ebc054f07bfea124fb08da432 (ORCL:VOTE3) [OCR]
Located 3 voting disk(s).
Any ideas why the cluster is not starting anymore ? I am afraid of restarting node 1...
chrisReally would help to know what operating system you are using...
When you set up the disks for use with ASM, did you stamp them with ASMLIB? If not, did you configure device persistance with udev? Without using one of these methods, the disk identification can change when a node is restarted, and ASM is then unable to locate the disks.
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