Does all voting disks in n node rac have same data

Hi,
I heard that Oracle/css access more than half of the voting disks, just had a question on that
1) Why does Oracle access more than half of the voting disks?
2) Why we keep odd number of voting disks?
3) Does Oracle keep same information in all the voting disks ? is it like control or redofile multiplexing?
4) Why we have only 2 ocr and not more than that?
Regards
ID

Hi,
1) Why does Oracle access more than half of the voting disks?
To join the cluster greater than half number of voting disks must be accessible for the cluster node, Oracle made this restriction so that even in worst cases all nodes must have access on one common disk. Let's try to understand with simple classical example of two node cluster node1 and node2 with two voting disk vote1 and vote2 and assuming vote1 is accessible for node1 only and vote2 is accessible for node2 only, in this case if Oracle allow the node to join the cluster by passing this restriction then conflict will occur as both the node writing information to different voting disk but with this restriction Oracke make sure that one disk must be commonly accessible for all the nodes. For example in case of three voting disk at least two must be accessible, if two voting disks are accessible then one disk will be commonly accessible for all the nodes.
2) Why we keep odd number of voting disks?
I already answered this question indirectly with the answer of your first question. Greater than half number of voting disks must be accessible so either you configure three or next even number i.e. four but number of failover voting disk remains same. In case of three failure of one voting disk can be tolerated and same in case of four voting disks.
3) Does Oracle keep same information in all the voting disks ? is it like control or redofile multiplexing?
Yes, Clusterware maintains same information in all voting disks its just the multiplex copy.
4) Why we have only 2 ocr and not more than that?
We can configure upto five mirror OCR disk. Here is excrept of my ocr.loc file
[root@host01 ~]# cat /etc/oracle/ocr.loc
#Device/file getting replaced by device /dev/sdb13
ocrconfig_loc=+DATA
ocrmirrorconfig_loc=/dev/sdb15
ocrconfig_loc3=/dev/sdb14
ocrconfig_loc4=/dev/sdb13
local_only=false[root@host01 ~]#
[root@host01 ~]#
[root@host01 ~]#
[root@host01 ~]# ocrconfig -add /dev/sdb12
[root@host01 ~]#
[root@host01 ~]#
[root@host01 ~]#
[root@host01 ~]# ocrconfig -add /dev/sdb11
PROT-27: Cannot configure another Oracle Cluster Registry location because the maximum number of Oracle Cluster Registry locations (5) have been configured
Thanks

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Checked the alert log:
{quote}
cssd(9506)]CRS-1601:CSSD Reconfiguration complete. Active nodes are oel32rac1 .
2011-08-04 15:58:55.356
[ctssd(9552)]CRS-2407:The new Cluster Time Synchronization Service reference node is host oel32rac1.
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[client(9567)]CRS-1001:The OCR was formatted using version 3.
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crsctl.log:
{quote}
2011-08-04 15:59:00.246: [ CRSCTL][3046184656]crsctl_vformat: obtain cssmode 1
2011-08-04 15:59:00.247: [ CRSCTL][3046184656]crsctl_vformat: obtain VFListSZ 0
2011-08-04 15:59:00.258: [ CRSCTL][3046184656]crsctl_vformat: Fails to obtain backuped Lease from CSSD with error code 16
2011-08-04 15:59:01.857: [ CRSCTL][3046184656]crsctl_vformat: to do clsscfg fmt with lease sz 0
2011-08-04 15:59:01.910: [   SKGFD][3046184656]NOTE: No asm libraries found in the system
2011-08-04 15:59:01.910: [    CLSF][3046184656]Allocated CLSF context
2011-08-04 15:59:01.910: [   SKGFD][3046184656]Discovery with str:/u02/storage/vdsk:
2011-08-04 15:59:01.910: [   SKGFD][3046184656]UFS discovery with :/u02/storage/vdsk:
2011-08-04 15:59:01.910: [   SKGFD][3046184656]Fetching UFS disk :/u02/storage/vdsk:
2011-08-04 15:59:01.911: [   SKGFD][3046184656]OSS discovery with :/u02/storage/vdsk:
2011-08-04 15:59:01.911: [   SKGFD][3046184656]Handle 0xa6c19f8 from lib :UFS:: for disk :/u02/storage/vdsk:
2011-08-04 17:10:37.522: [   SKGFD][3046184656]WARNING:io_getevents timed out 618 sec
2011-08-04 17:10:37.526: [   SKGFD][3046184656]WARNING:io_getevents timed out 618 sec
{quote}
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{quote}
2011-08-04 15:58:56.214: [ OCRRAW][3046991552]ibctx: Failed to read the whole bootblock. Assumes invalid format.
2011-08-04 15:58:56.214: [ OCRRAW][3046991552]proprinit:problem reading the bootblock or superbloc 22
2011-08-04 15:58:56.214: [ OCROSD][3046991552]utread:3: Problem reading buffer 8532000 buflen 4096 retval 0 phy_offset 102400 retry 0
2011-08-04 15:58:56.214: [ OCROSD][3046991552]utread:3: Problem reading buffer 8532000 buflen 4096 retval 0 phy_offset 102400 retry 1
2011-08-04 15:58:56.214: [ OCROSD][3046991552]utread:3: Problem reading buffer 8532000 buflen 4096 retval 0 phy_offset 102400 retry 2
2011-08-04 15:58:56.214: [ OCROSD][3046991552]utread:3: Problem reading buffer 8532000 buflen 4096 retval 0 phy_offset 102400 retry 3
2011-08-04 15:58:56.214: [ OCROSD][3046991552]utread:3: Problem reading buffer 8532000 buflen 4096 retval 0 phy_offset 102400 retry 4
2011-08-04 15:58:56.214: [ OCROSD][3046991552]utread:3: Problem reading buffer 8532000 buflen 4096 retval 0 phy_offset 102400 retry 5
2011-08-04 15:58:56.214: [ OCRRAW][3046991552]propriogid:1_1: Failed to read the whole bootblock. Assumes invalid format.
2011-08-04 15:58:56.365: [ OCRRAW][3046991552]iniconfig:No 92 configuration
2011-08-04 15:58:56.365: [ OCRAPI][3046991552]a_init:6a: Backend init successful
2011-08-04 15:58:56.390: [ OCRCONF][3046991552]Initialized DATABASE keys
2011-08-04 15:58:56.564: [ OCRCONF][3046991552]csetskgfrblock0: output from clsmft: [clsfmt: successfully initialized file /u02/storage/ocr
2011-08-04 15:58:56.577: [ OCRCONF][3046991552]Successfully set skgfr block 0
2011-08-04 15:58:56.578: [ OCRCONF][3046991552]Exiting [status=success]...
{quote}
ocssd.log:
{quote}
2011-08-04 15:59:00.140: [    CSSD][2963602320]clssgmFreeRPCIndex: freeing rpc 23
2011-08-04 15:59:00.228: [    CSSD][2996054928]clssgmExecuteClientRequest: CONFIG recvd from proc 6 (0xb35f7438)
2011-08-04 15:59:00.228: [    CSSD][2996054928]clssgmConfig: type(1)
2011-08-04 15:59:00.234: [    CSSD][2996054928]clssgmExecuteClientRequest: VOTEDISKQUERY recvd from proc 6 (0xb35f7438)
2011-08-04 15:59:00.247: [    CSSD][2996054928]clssgmExecuteClientRequest: CONFIG recvd from proc 6 (0xb35f7438)
2011-08-04 15:59:00.247: [    CSSD][2996054928]clssgmConfig: type(1)
2011-08-04 15:59:03.039: [    CSSD][2942622608]clssnmSendingThread: sending status msg to all nodes
2011-08-04 15:59:03.039: [    CSSD][2942622608]clssnmSendingThread: sent 4 status msgs to all nodes
2011-08-04 15:59:07.047: [    CSSD][2942622608]clssnmSendingThread: sending status msg to all nodes
2011-08-04 15:59:07.047: [    CSSD][2942622608]clssnmSendingThread: sent 4 status msgs to all nodes
2011-08-04 15:59:11.057: [    CSSD][2942622608]clssnmSendingThread: sending status msg to all nodes
2011-08-04 15:59:11.057: [    CSSD][2942622608]clssnmSendingThread: sent 4 status msgs to all nodes
2011-08-04 15:59:16.068: [    CSSD][2942622608]clssnmSendingThread: sending status msg to all nodes
2011-08-04 15:59:16.068: [    CSSD][2942622608]clssnmSendingThread: sent 5 status msgs to all nodes
2011-08-04 15:59:21.079: [    CSSD][2942622608]clssnmSendingThread: sending status msg to all nodes
2011-08-04 15:59:21.079: [    CSSD][2942622608]clssnmSendingThread: sent 5 status msgs to all nodes
{quote}
Any help here is appreciated.
Regards
Amith R
Edited by: Mithzz on Aug 4, 2011 4:58 AM

Did an lsof on vdisk and it showed
>
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
crsctl.bi 9589 root 26u REG 8,17 21004288 102980 /u02/storage/vdsk
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Thanks,
B

Salut Marc
I can confirm that the command given (crsctl add css votedisk path) works quite well. but sometimes you can get the following Bug 4898020 ADDING VOTING DISK ONLINE CRASH THE CRS. This should be fixed in the 10.2.0.4 patchset
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DB Version - Oracle 11.2.0,3
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i need to do an appropriate size , so when i back up using dd command , it don't take very long
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Thanks for help

You asked if you are missing something and my initial thought is that what you missed was reading the docs.
First of all the recommended size is clearly stated in the docs ... so I am not going to hand it to you and force you to read them. I hope everyone else does so too.
Second of all, and most importantly, if you have any concept of what the Voting Disk is ... why on earth would you think that making a large one, or a small one, has any relevance to its use? Are you planning to build a cluster larger than 128 nodes?
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Think of you can not start your guest VMs just because it has a corrupted system.img root image. And assume it contains 5 physical disk( which are all created by the RAC template) hence ASM on them.
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Thank you

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Now i am reorganising SAN by scrapping the entire SAN and cretaing new LUN's (It's a must)
so pleae let me know
1) how do i take backup of OCR and Voting Disk from existing SAN and how do i restore it in new LUN's after SAN reorganisation
2) how do i take backup of existing Database's from existing SAN and how do i restore it in new LUN's after SAN reorganisation.
I will be doing it in Planned downtime only
Regards,
DB

For step 1 you should following metalink doc.
For step 2 here is simple backup command script.
I have done this in windows for you.
D:\app\ranjit\product\11.2.0\dbhome_1\BIN>rman target /
Recovery Manager: Release 11.2.0.1.0 - Production on Wed Feb 8 21:48:47 2012
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
connected to target database: ORCL (DBID=1299593730)
RMAN> run
+{+
allocate channel c1 device type disk format 'D:\app\ranjit\rman\%U';
allocate channel c2 device type disk format 'D:\app\ranjit\rman\%U';
backup database;
backup current controlfile format 'D:\app\ranjit\rman\%U';
+}+
Regards

Voting disk and OCR disk in RAC

Can anyone explain me in basic terms ...
For what Voting and OCR disk are used in RAC.

Hi Francisco,
Thanks for the information.
But i am having lot of doubts in Voting disk and types of heart-beats present in Oracle 10g RAC.
As Oracle says css uses two heart beats 1. Network heart-beat 2. Disk heart-beat
My doubts:
1. How Oracle uses voting disk to avoid split-brain syndrome? OR what is the role of voting disk in split-brain syndrome?
2. How Oracle monitors remote node health?
3. Oracle says there is one more heart-beat where ckpt process keep on writing to control file for every 3 seconds and if it fails lmon process will evict the node....Is it true?
5. Oracle Clusterware will send messages (via a special ping operation) to all nodes configured in the cluster, often called the "heartbeat." If the heartbeat fails for any of the nodes, it checks with the Oracle Clusterware configuration files (Voting disk) to distinguish between a real node failure and a network failure......Is it true? If true then what about the two heart beats(Network and Disk)...why these heart-beats are present or useful?
If possible please clear my doubts by giving some simple examples....
Awaiting for your reply and too much eager to learn and expertise in Oracle RAC architecture before administering it.
Regards,
Yasser.

Does all voting disks in n node rac have same data

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