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What is OCR and Voting disk:
The voting disk is a file that manages information about node
membership, and the OCR is a file that manages cluster and Oracle
RAC database configuration information. The Oracle Clusterware
installation process creates the voting diskand the OCR on
shared storage.
OCR is used to
manage to manage Oracle cluster-ware and it’s component such as RAC database,
listener, VIP,Scan IP & Services. Note:- Minimum one and maximum 5 copies
of OCR is allowed.
Voting Disk manages
information about node membership. Each voting disk must be accessible by all
nodes in the cluster. If any of the cluster node is not passing heat-beat
across other node or voting disk, then that node will be evicted by Voting disk.
Minimum 1 and maximum 15 copy of voting disk is possible.
Minimum 1 and maximum 15 copy of voting disk is possible.
To check the status and location of
the votedisk
[grid ~]$
crsctl query css votedisk
## STATE
File Universal Id
File Name Disk group
-- -----
----------------- --------- ---------
1. ONLINE
d6450284de354f6cbf69aafa272f701d (ORCL:OCRVOTE) [OCRVOTE]
Located 1
voting disk(s).
To check the status and location of
the OCR
[root~]#
ocrcheck
Status of
Oracle Cluster Registry is as follows :
Version : 4
Total space (kbytes) :
409568
Used space (kbytes) :
1712
Available space (kbytes) : 407856
ID : 1914186779
Device/File Name :
+OCRVOTE
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 succeeded
Also, the OCR File information kept on file /etc/oracle/ocr.loc
cat
/etc/oracle/ocr.loc
ocrconfig_loc=+OCRVOTE/UAT01-CLUSTER/OCRFILE/registry.255.920778331
local_only=FALSE
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