CRS and Voting - Backup and Recovery CRS and Voting Loss backup for CRS and Voting file is based on dd a) CRS loss rm –f /oracle01/oracrs/ocr.dbf [oracle@oracle-experts crsd]$ rm -f /oracle01/oracrs/ocr.dbf Impact: No impact on node apps In event of a failure, before you attempt to restore the OCR, ensure that the OCR is unavailable. Run the following command to check the status of the OCR: ocrcheck [oracle@oracle-experts crsd]$ ocrcheck PROT-602: Failed to retrieve data from the cluster registry [oracle@oracle-experts crsd]$ cluvfy comp ocr -n all Verifying OCR integrity Checking OCR integrity... Checking the absence of a non-clustered configuration... All nodes free of non-clustered, local-only configurations. ERROR: Unable to obtain OCR integrity details from any of the nodes. OCR integrity check failed. Verification of OCR integrity was unsuccessful on all the nodes. Restore: Stop the Clusterware in all the nodes [root@oracle-experts ~]# /etc/init.d/init.crs stop Shutting down Oracle Cluster Ready Services (CRS): OCR initialization failed accessing OCR device: PROC-26: Error while accessing the physical storage Operating System error [No such file or directory] [2] Shutdown has begun. The daemons should exit soon. [root@oracle-experts ~]# [root@oracle-experts ~]# /etc/init.d/init.crs stop Shutting down Oracle Cluster Ready Services (CRS): OCR initialization failed accessing OCR device: PROC-26: Error while accessing the physical storage Operating System error [No such file or directory] [2] Shutdown has begun. The daemons should exit soon. [root@oracle-experts ~]# [root@oracle-experts ~]# dd if=/data01/home/oracle/voting_backup/ocrbp.dbf of=/oracle01/oracrs/ocr.dbf 20480+0 records in 20480+0 records out [root@oracle-experts ~]# chown root:oinstall /oracle01/oracrs/ocr.dbf Bring up the cluster in all the nodes [oracle@oracle-experts ~]$ ocrcheck Status of Oracle Cluster Registry is as follows : Version : 2 Total space (kbytes) : 262120 Used space (kbytes) : 3776 Available space (kbytes) : 258344 ID : 767132006 Device/File Name : /oracle01/oracrs/ocr.dbf Device/File integrity check succeeded Device/File not configured Cluster registry integrity check succeeded [oracle@oracle-experts ~]$ b) Voting file The Voting Disk is used by the Oracle cluster manager in various layers. The Node Monitor (NM) uses the Voting Disk for the Disk Hearbeat, which is essential in the detection and resolution of cluster "split brain". NM monitors the Voting Disk for other competing sub-clusters and uses it for the eviction phase. Hence the availability from the Voting Disk is critical for the operation of the Oracle Cluster manager. There are 2 methods to recover from the voting file failure a) use dd to restore voting file from the backup – Recommended b) Re-install CRS Note: As per the testing, please make sure to change the owner ship and permission on the voting files. #chown root:oinstall <voting file> #chmod 666 <voting file> |