Asm instances on single system

Hi ,
How many ASM instance can reside on one single machine.....

Hi,
Only one ASM instance can run on a server.
Mahir

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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

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.

Create a new user for oracle 10G ASM instance with sysdba system privilege

Hi,
In our Golden Gate Project, we require the SYS user credential to connect to the Oracle 10g ASM instance to read the database transaction logs.But our client is not providing the SYS user credential to connnect to ASM instance.
I'm getting the error message "ORA-01109: database not open",When I tried to create a new user using the below the steps in oracle 10g ASM instance
1. Login using "sqlplus / as sysdba"
2. Create user <username> identified by <password>;
But in oracle 11g ASM instance, I'm able to create new user by connecting the ASM instance with SYSASM role without issues.
Is there is any workaround to create a new user with sysdba system privilege in oracle 10g ASM instance?.
Thanks in advance .

Hi,
Recreate the password file for the ASM instance as follows:
Unix:
orapwd file=<ORACLE_HOME>/dbs/PWD<SID> password=<sys_password>
Windows:
orapwd file=<ORACLE_HOME>/database/PWD<SID>.ora password=<sys_password>
Now sys password is reset, we are ready to use sys for ASM management. I decided to create another user ASMDBA as I tried above.
SQL> create user ASMDBA identified by test01;
User created.
SQL> grant SYSASM, SYSOPER to ASMDBA;
Grant succeeded.
SQL> select * from v$pwfile_users;
USERNAME SYSDBA SYSOPE SYSASM
SYS TRUE TRUE TRUE
ASMDBA FALSE TRUE TRUE
Please see this link : http://orachat.com/how-to-change-asm-sys-password-creating-sysasm-user-11g/
Thank you

Multiple ASM instances using single cluster install - Is it possible??

Hi,
I have 2 node RAC cluster installed on Linux. All the storage is on EMC. I need to setup another environment using HP storage on the same hosts. Is it possible to created second ASM instance using the same cluster install?? I wanted to have clear separation b/w EMC and HP environments and that's wondering if it's feasible to do that.
Haven't tried it yet to see if it complains.
Thx
Anitha

Anitha,
The data migration won't happen (at least not aggressively) until you do step 2 in your list where you remove the EMC disks. That removal operation will take a long time as Oracle will have to move the data before it can complete the operation. If you want to be sure, I'd recommend creating a new disk group with one of your new disks, put a small tablespace in it, create some data in it, then add a disk to that new group and remove the original disk. Then you'll have some confidence in the procedure and verify that it works without risking your production data. After you test, you can drop the disk group and use the disks for their intended purposes.
To answer your question, yes, that's the process exactly as I suggested it above. Should work fine--but will probably take a while to do the remove, so be prepared to leave that running for quite a while (i.e. don't expect to close the terminal and go home right after running the remove).
Dan

Error while starting ASM instance

when i was trying to startup my ASM database , i was getting the following error.
SQL> startup
ASM instance started
Total System Global Area 125829120 bytes
Fixed Size 2019000 bytes
Variable Size 98644296 bytes
ASM Cache 25165824 bytes
ORA-15032: not all alterations performed
ORA-15003: diskgroup "DBDATA" already mounted in another lock name space"
thnx in advance

Hi,
i was not aware of ASM anymore, i can give some more details of this.
There was already an instance named +ASM in the host, which has the diskgroup 'DBDATA' created.
But now i have created a new instance and i was trying to connect to the same diskgroup.
I dont have permission of the root, but i have the oracle login.
could u pleaze help me in this regard...
i need to connect to the diskgroup, if i try to stop the other instance, i was not getting the error, but the diskgroup is getting dis-mounted.
thnx alot for the replies

ASM instance wont mount diskgroup..

HI, I have 10g release 2 installed on CENTOS 4.4, I use ASM striping with with 4 raw disks.
I had a system crash due to a power failure and now the the ASM wont mount the diskgroup.
export $ORACLE_HOME=+ASM
SQL> startup mount;
ASM instance started
Total System Global Area 130023424 bytes
Fixed Size 2071000 bytes
Variable Size 102786600 bytes
ASM Cache 25165824 bytes
ORA-15110: no diskgroups mounted
SQL> alter diskgroup RESEARCH1 mount;
alter diskgroup RESEARCH1 mount
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15063: ASM discovered an insufficient number of disks for diskgroup
"RESEARCH1"
now when I use /etc/init.d/oracleasm listdisks I can see all my disks:
DISK1
DISK2
DISK3
DISK4
then i tried to change asm_diskstring to point the mounting point, here is my ora file:
*.asm_diskgroups='RESEARCH1'
+ASM.asm_diskgroups='RESEARCH1' #Manual Dismount
*.asm_diskstring='/dev/oracleasm/disks'
*.background_dump_dest='/home/oracle/product/10.2.0/db_1/admin/+ASM/bdump'
*.core_dump_dest='/home/oracle/product/10.2.0/db_1/admin/+ASM/cdump'
*.instance_type='asm'
*.large_pool_size=12M
*.remote_login_passwordfile='EXCLUSIVE'
*.user_dump_dest='/home/oracle/product/10.2.0/db_1/admin/+ASM/udump'
any ideas?
Thanks
Assaf

Hi,
by oracleasm lib utility you can configure as below
# /etc/init.d/oracleasm configure
Default user to own the driver interface [oracle]: oracle
Default group to own the driver interface [dba]: dba
Start Oracle ASM library driver on boot (y/n) [y]: y
Fix permissions of Oracle ASM disks on boot (y/n) [y]: y
Writing Oracle ASM library driver configuration: [ OK ]
Scanning system for ASM disks: [ OK ]
# /etc/init.d/oracleasm enable
Thanks

Drop ASM instance.

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.

ASM instance startup problem..

Hi,
SQL> startup
ASM instance started
Total System Global Area 79691776 bytes
Fixed Size 1289004 bytes
Variable Size 53236948 bytes
ASM Cache 25165824 bytes
ORA-15032: not all alterations performed
ORA-15063: ASM discovered an insufficient number of disks for diskgroup "DATA"
DB Version=10.2.0.2.0
Os = windows xp
Thanks,

ORA-15063:     ASM discovered an insufficient number of disks for diskgroup "string"
Cause:     ASM was unable to find a sufficient number of disks belonging to the diskgroup to continue the operation.
Action:     Check that the disks in the diskgroup are present and functioning, that the owner of the ORACLE binary has read/write permission to the disks, and that the ASM_DISKSTRING initialization parameter has been set correctly. Verify that ASM discovers the appropriate disks by querying V$ASM_DISK from the ASM instance.

Trying to create ASM instance, thinks one already exists?

I've got a problem with creating the ASM instance. Basically, I've reinstalled (v11.1.0.6) clusterware, and two database software installs (one for asm, one for db) due to a san swap. Now, I believe that there is still a hangover to the original installation. When creating the ASM instance through DBCA on Windows, I get the following:
DBCA could not startup the ASM instance configured on this node. To proceed with ASM diskgroup management you need the ASM instance to be up and running. Do you want to recreate the ASM instance on this node?
Yes
Enter password
DBCA will now create and start the ASM instance. After the ASM instance is started, you can create disk groups to be used as storage for your database.
OK
ASM Instance Creation...
Encountered file error when copying listeners from home=D:\oracle\product\11.1.0\asm_2
OK
The operation will be stopped. Re-run DBCA after successfully running NetCA.
I have a listener running (listener_rac), I have a similar problem with netca as it says I already have a listener called listener, which I do not, however, I have created listener_rac instead.
I feel trhat the problem is that ASM1 (for node 1) or ASM2 (for node 2) already exists. However, I can not find either of these. I can create an ASM instance in single node mode, however, this creates an instance +ASM, which does not conflict.
How do I find the non-existent instance, and remove it? (not in registry or services)
Alternatively, any other ideas as to what is happening?
Thank you for your time.

I have a listener running (listener_rac), I have a similar problem with netca as it says I already have a listener called listener, which I do not, however, I have created listener_rac insteadDBCA created your listener... you can check on listener status
srvctl status nodeapps -n node01
Listener is running on node: node01
srvctl status nodeapps -n node02
Listener is running on node: node02
if not start, start it by
Usage: srvctl start listener -n <node_name> [-l <lsnr_name_list>]
srvctl start listener -n node01
by the way, you cam use "netca" delete/recreate (listener_rac)
After that, point to ASM:
I feel trhat the problem is that ASM1 (for node 1) or ASM2 (for node 2) already exists. However, I can not find either of these. What did you see?
crs_stat
srvctl status asm -n node01
srvctl status asm -n node02
if you see asm on node01/node2... you can start them if thet offline
srvctl start asm -n node01
srvctl start asm -n node02
and then.. use "DBCA" to help create ASM diskgroups.
I can create an ASM instance in single node mode, however, this creates an instance +ASM, which does not conflict.that can conflict.. don't start it (+ASM)
How do I find the non-existent instance, and remove it? (not in registry or services)
Alternatively, any other ideas as to what is happening?use "crs_stat" command
http://download.oracle.com/docs/cd/B28359_01/rac.111/b28255/crsref.htm#CWADD6025
and use "srvctl"
http://download.oracle.com/docs/cd/B28359_01/rac.111/b28254/srvctladmin.htm#RACAD028

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
Sannidhi

I 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

Rconfig fails for migrate single ASM instance to Oracle RAC 11.2.0.3

We completed the following steps thus far to migrate single instance with ASM 11.2.0.3 on Oracle Linux to RAC:
1. Install RAC CRS 11.2.0.3 in GRID_HOME
2. Install RAC database 11.2.0.3 software in new ORACLE_HOME
3. Added ASM diskgroups to two node ASM instances
4. run rconfig from target RAC ORACLE_HOME
It fails on:
[RACConvertStep.execute:193] STEP Result=Oracle home is not a cluster database home. Make sure that oracle binary is linked with RAC option and the Oracle home entry in Oracle inventory is updated with cluster node list.
From rconfig:
$ rconfig convert.xml
<?xml version="1.0" ?>
<RConfig version="1.1" >
<ConvertToRAC>
<Convert>
<Response>
<Result code="1" >
Operation Failed
</Result>
<ErrorDetails>
Oracle home is not a cluster database home. Make sure that oracle binary is linked with RAC option and the Oracle home entry in Oracle inventory is updated with cluster node list.
</ErrorDetails>
</Response>
</Convert>
</ConvertToRAC></RConfig>
5. the orainventory inventory xml file has:
6. We have this:
Source database
ORACLE_BASE=/oracle
ORACLE_HOME=/oracle/db/112
3- target database configuration
ORACLE_BASE=/oracle/db
ORACLE_HOME=/oracle/db/11.2.0.3
4- RAC GRID_HOME
ORACLE_BASE=/oracle
GRID_HOME=/oracle/11.2.0/grid
Has anyone seen this issue before with migrating with rconfig and if so, how did you resolve it?

good to know. thanks for updating the thread with what was wrong, this will help the community if someone faces this issue.

Upgrade direct from 9i File System DB to 10g ASM instance

Can I upgrade from a 9i file system based instance directly to a 10g ASM based instance? without the middle step of a 10g file system instance.
Thanks
MN

The minimum compatibility for ASM storage system is 10.1.0, it is not possible to manage 9i instances in ASM, and there is no way to waive the 10g migration requirement.
If you are planning to use 10g ASM storage then you will have to migrate or upgrade your database to 10g first. Next you will have to move your datafiles, control and log files into the ASM storage.
0. Configure your +ASM instance
1. Upgrade to 10g (Upgrade procedure) or Migrate (exp from 9i/imp to 10g)
2. In case you upgraded then use RMAN as stated in the below given reference to move your datafiles to the ASM instance, or if you created the database in 10g make sure you defined +ASM as the default storage mechanism
Ref. Oracle® Database Backup and Recovery Advanced User's Guide
10g Release 2 (10.2)
Part Number B14191-03
Chapter 16.
http://download.oracle.com/docs/cd/B19306_01/backup.102/b14191/rcmasm.htm#i1016581
~ Madrid
http://hrivera99.blogspot.com

Convert ASM single instance to RAC ASM instance...

Hi, all
Im installing OracleDatabase with RAC and I got an error on the Database Configuration Assistant that says "The ASM instance configured on the local node is a single instance. To manage this instance as a single-instance ASM restart DBCA and select the single instance database option. To manage this instance as RAC ASM, convert it to RAC ASM first".
How I can convert it??
Thanks

See the link below for converting a single instance ASM to RAC ASM. The link is to the Oracle® Database Oracle Clusterware and Oracle Real Application Clusters Installation Guide for Linux. If your platform is not Linux, check the Install Guide for your OS.
http://download-east.oracle.com/docs/cd/B19306_01/install.102/b14203/cvrt2rac.htm#BABJDAJG

How many sql server express instances i can install maximum in single system

Hello Team,
I want to install multiple sql express instances in single machine. My question is that how many instances of sql server express editions i can install in single machine ?
Thanks,
Udaya Kumar
udaya kumar

For practical reasons as much as you like you probably would not exceed in any case 10 instances because after that resource crunch would start but any how you can read Max specification for SQL Server
More accurate answer is "50 instances on a stand-alone server for all SQL Server editions."
https://msdn.microsoft.com/en-us/library/ms143432.aspx
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Asm instances on single system

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