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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.
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).
[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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