voting disk and OCR IN RAC

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:

-bash-3.2$ crsctl query css votedisk

##  STATE    File Universal Id                File Name Disk group

--  -----    -----------------                --------- ---------

 1. ONLINE   9095dc8a0e4d4f40bfd3a8b6ed02d7c1 (/dev/dbq_rawvote) [OCRVD]

Located 1 voting disk(s).

to check OCR

bash-3.2$ ocrcheck

Status of Oracle Cluster Registry is as follows :

         Version                  :          3

         Total space (kbytes)     :     262120

         Used space (kbytes)      :       3308

         Available space (kbytes) :     258812

         ID                       :  376930295

         Device/File Name         :     +OCRVD

                                    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

to check local OLR

ddcfusdbq01 /grid/app/11.2.0/grid/bin #./ocrcheck -local

Status of Oracle Local Registry is as follows :

         Version                  :          3

         Total space (kbytes)     :     262120

         Used space (kbytes)      :       2704

         Available space (kbytes) :     259416

         ID                       :  367014315

         Device/File Name         : /grid/app/11.2.0/grid/cdata/ddcfusdbq01.olr

                                    Device/File integrity check succeeded

         Local registry integrity check succeeded

         Logical corruption check succeeded