Monday, June 4, 2012

OCR And Voting In 11gR2

OCR: It created at the time of Grid Installation. It’s store information to manage Oracle cluster-ware and it’s component such as RAC database, listener, VIP,Scan IP & Services.
Minimum 1 and maximum 5 copy of OCR is possible.

Voting Disk: It manage information about node membership. Each voting disk must be accessible by all nodes in the cluster.If any node is not passing heat-beat across other note or voting disk, then that node will be evicted by Voting disk.
Minimum 1 and maximum 15 copy of voting disk is possible.


New Facts:
  • We can store OCR And Voting disk on ASM or certified cluster file system.
  • We can dynamically add or replace voting disk & OCR.
  • Backup of Voting disk using “dd” command not supported.
  • Voting disk and OCR can be keep in same disk-group or different disk-group
  • Voting disk and OCR automatic backup kept together in a single file.
  • Automatic backup of Voting disk and OCR happen after every four hours, end of the day, end of the week
  • You must have root or sudo privilege account to manage it.

To find current location of Voting disk:

[oracle@rsingle ~]$ crsctl query css votedisk
##  STATE    File Universal Id                File Name Disk group
–  —–    —————–                ——— ———
1. ONLINE   6a60a2c3510c4fbfbff62dcdc279b247 (ORCL:DATA1) [DATA]

Relocate or multiplexing Voting disk to another disk-group (With normal redundancy)

[root@rsingle ~]# /u01/app/11.2.0/grid/bin/crsctl replace votedisk +CRS
Successful addition of voting disk afb77b2693a24f1ebfe876784103e82a.
Successful addition of voting disk 3e2542c5b1154ffdbfc8b6dea7dce390.
Successful addition of voting disk 8e0f3c5921cc4f93bf223de1465d83cc.
Successful deletion of voting disk 6a60a2c3510c4fbfbff62dcdc279b247.
Successfully replaced voting disk group with +CRS.
CRS-4266: Voting file(s) successfully replaced

New location of Voting disk:

[root@rsingle ~]# /u01/app/11.2.0/grid/bin/crsctl query css votedisk

##  STATE    File Universal Id                File Name Disk group
–  —–    —————–                ——— ———
1. ONLINE   afb77b2693a24f1ebfe876784103e82a (ORCL:DATA2) [CRS]
2. ONLINE   3e2542c5b1154ffdbfc8b6dea7dce390 (ORCL:DATA3) [CRS]
3. ONLINE   8e0f3c5921cc4f93bf223de1465d83cc (ORCL:DATA4) [CRS]
Located 3 voting disk(s).

To find location of Corrent OCR:

[oracle@rsingle ~]$ ocrcheck

Status of Oracle Cluster Registry is as follows :
Version                  :          3
Total space (kbytes)     :     262120
Used space (kbytes)      :       2964
Available space (kbytes) :     259156
ID                       : 1390115973
Device/File Name         :      +DATA
Device/File integrity check succeeded
Device/File not configured
Device/File not configured
Device/File not configured
Device/File not configured
Cluster registry integrity check succeeded
Logical corruption check bypassed due to non-privileged user

Create mirror copy of OCR online

[oracle@rsingle ~]$ sudo ocrconfig -add +CRS
Password:

Check location of OCR after mirror copy creation:

[root@rsingle ~]# /u01/app/11.2.0/grid/bin/ocrcheck

Status of Oracle Cluster Registry is as follows :
Version                  :          3
Total space (kbytes)     :     262120
Used space (kbytes)      :       2964
Available space (kbytes) :     259156
ID                       : 1390115973
Device/File Name         :      +DATA
Device/File integrity check succeeded
Device/File Name         :       +CRS
Device/File integrity check succeeded
Device/File not configured
Device/File not configured
Device/File not configured
Cluster registry integrity check succeeded
Logical corruption check succeeded
Another file to find location of OCR:

[root@rsingle ~]# cat /etc/oracle/ocr.loc
#Device/file  getting replaced by device +CRS
ocrconfig_loc=+DATA
ocrmirrorconfig_loc=+CRS

Share it for knowledge

Thank you atual
 Osama mustafa

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