Managing OCR and voting disks
Posted by John Hallas on November 28, 2012
This is basically a set of notes I wrote for myself about adding new voting disks and OCR disks to a sandpit RAC cluster as part of testing for migration between HP XP disk array and HP 3PAR disk array. The o/s was HPUX with 11.1.0.7 database.
View status of OCR disks and Voting disks
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| sudo /app/oracle/product/crs/bin/ocrcheck |
Status of Oracle Cluster Registry is as follows :
Version : 2
Total space (kbytes) : 306972
Used space (kbytes) : 5880
Available space (kbytes) : 301092
ID : 746041401
Device/File Name : /dev/oracle/disk500
Device/File integrity check succeeded
Device/File Name : /dev/oracle/disk501
Device/File integrity check succeeded
Cluster registry integrity check succeeded
Logical corruption check succeeded
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| crsctl query css votedisk |
0. 0 /dev/oracle/disk502
1. 0 /dev/oracle/disk503
2. 0 /dev/oracle/disk504
Located 3 voting disk(s).
Add a new OCR disk
Backup first (the 10GR1 command format still works)
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| sudo /app/oracle/product/crs/bin/ocrconfig -export /home/oracle/ocr_backup -s online |
Owned by root
-rw——- 1 root sys 136140 Nov 27 08:15 /home/oracle/ocr_backup
As this is an 11GR1 cluster we will use the 11GR1 format
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| sudo /app/oracle/product/crs/bin/ocrconfig -manualbackup |
dhpor43 2012/11/27 08:23:00 /app/oracle/product/crs/cdata/SANDPITR1/backup_20121127_082300.ocr
Listing the backups shows the recent backups
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| sudo /app/oracle/product/crs/bin/ocrconfig -showbackup |
dhpor43 2012/11/27 06:36:27 /app/oracle/product/crs/cdata/SANDPITR1/backup00.ocr
dhpor43 2012/11/27 02:36:27 /app/oracle/product/crs/cdata/SANDPITR1/backup01.ocr
dhpor43 2012/11/26 22:36:27 /app/oracle/product/crs/cdata/SANDPITR1/backup02.ocr
dhpor43 2012/11/25 02:36:27 /app/oracle/product/crs/cdata/SANDPITR1/day.ocr
dhpor43 2012/11/24 06:36:27 /app/oracle/product/crs/cdata/SANDPITR1/week.ocr
dhpor43 2012/11/27 08:23:00 /app/oracle/product/crs/cdata/SANDPITR1/backup_20121127_082300.ocr
I have 3 disks available (all at 1Gb, which is easily enough for either a voting or OCR disk)
Free ASM disks and their paths
==============================
Header Mode Path Disk Size
——— ——– ————————- ———
CANDIDATE ONLINE /dev/oracle/disk507 1Gb
CANDIDATE ONLINE /dev/oracle/disk508 1Gb
CANDIDATE ONLINE /dev/oracle/disk509 1Gb
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| sudo /app/oracle/product/crs/bin/ocrconfig -replace ocrmirror /dev/oracle/disk507 |
ocrcheck
Status of Oracle Cluster Registry is as follows :
Version : 2
Total space (kbytes) : 306972
Used space (kbytes) : 5908
Available space (kbytes) : 301064
ID : 746041401
Device/File Name : /dev/oracle/disk500
Device/File integrity check succeeded
Device/File Name : /dev/oracle/disk507 disk replaced (was disk501)
Device/File integrity check succeeded
Cluster registry integrity check succeeded
However the replaced disk is not available although 507 has been removed from the list of candidate disks
Free ASM disks and their paths
==============================
Header Mode Path Disk Size
——— ——– ————————- ———
CANDIDATE ONLINE /dev/oracle/disk508 1Gb
CANDIDATE ONLINE /dev/oracle/disk509 1Gb
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| sudo /app/oracle/product/crs/bin/ocrconfig -replace ocr /dev/oracle/disk508 |
app/oracle/product/11.1.0/asm/bin $ocrcheck
Status of Oracle Cluster Registry is as follows :
Version : 2
Total space (kbytes) : 306972
Used space (kbytes) : 5908
Available space (kbytes) : 301064
ID : 746041401
Device/File Name : /dev/oracle/disk508
Device/File integrity check succeeded
Device/File Name : /dev/oracle/disk507
Device/File integrity check succeeded
Add a new voting disk
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| sudo /app/oracle/product/crs/bin/crsctl add css votedisk /dev/oracle/disk500 –force |
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| /app/oracle/product/crs/bin/crsctl add css votedisk /dev/oracle/disk509 -force |
Now formatting voting disk: /dev/oracle/disk500.
Successful addition of voting disk /dev/oracle/disk500.
app/oracle/product/11.1.0/asm/bin $sudo /app/oracle/product/crs/bin/crsctl query css votedisk
0. 0 /dev/oracle/disk502
1. 0 /dev/oracle/disk503
2. 0 /dev/oracle/disk504
3. 0 /dev/oracle/disk509
4. 0 /dev/oracle/disk500
Located 5 voting disk(s).
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| crsctl delete css votedisk /dev/oracle/disk509 |
Successful deletion of voting disk /dev/oracle/disk509.
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| crsctl delete css votedisk /dev/oracle/disk500 |
Successful deletion of voting disk /dev/oracle/disk500.
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| sudo /app/oracle/product/crs/bin/crsctl query css votedisk |
0. 0 /dev/oracle/disk502
1. 0 /dev/oracle/disk503
2. 0 /dev/oracle/disk504
Located 3 voting disk(s).
My follow up actions are to see if Linux performs in the same manner and what the difference is on a 11GR2 cluster. Finally I want to understand why the released disk retained their header and if there is any way of avoiding having to dd the header. I expect that asmlib on Linux will prove different
