OCR backup and recovery

View the OCR storage location

[[email protected] ~]$ ocrcheckStatus of Oracle Cluster Registry is as follows : Version                  :          2 Total space (kbytes)     :     262120 Used space (kbytes)      :       5432 Available space (kbytes) :     256688 ID                       :  982267297 Device/File Name         : /oradata/crs_data/ocr.dat                                    Device/File integrity check succeeded                                    Device/File not configured Cluster registry integrity check succeeded

OCR is automatically backed up every 4 hours. My automatic backup location is/Oracle/APP/Oracle/product/10.2.0/CRS/CDATA/CRS. You can run the command ocrconfig to view the backup.

[[email protected] ~]$ ocrconfig -showbackuprac2     2014/08/25 14:31:15     /oracle/app/oracle/product/10.2.0/crs/cdata/crsrac2     2014/08/25 10:31:15     /oracle/app/oracle/product/10.2.0/crs/cdata/crsrac2     2014/08/22 17:46:32     /oracle/app/oracle/product/10.2.0/crs/cdata/crsrac2     2014/08/25 10:31:15     /oracle/app/oracle/product/10.2.0/crs/cdata/crsrac2     2014/08/22 17:46:32     /oracle/app/oracle/product/10.2.0/crs/cdata/crs

There are currently five groups of automatic backup, Oracle will retain up to five groups, backup00.ocr is the last backup, day _. OCR is a backup within one day, week _. OCR is a backup within one week. It is best to use the latest group

Simulate OCR corruption, delete OCR, and use backup to restore

[[email protected] ~]$ cd /oradata/crs_data[[email protected] crs_data]$ lsocr.dat vote.dat[[email protected] crs_data]$ rm -f ocr*

Check the service again and find that the CRS service is still normal. This is because the CRS cache is currently used.

[[email protected] crs_data]$ crs_stat -tName           Type           Target    State     Host        ------------------------------------------------------------ora....b1.inst application    ONLINE    ONLINE    rac1        ora....b2.inst application    ONLINE    ONLINE    rac2        ora.asmdb.db   application    ONLINE    ONLINE    rac1        ora....SM1.asm application    ONLINE    ONLINE    rac1        ora....C1.lsnr application    ONLINE    ONLINE    rac1        ora.rac1.gsd   application    ONLINE    ONLINE    rac1        ora.rac1.ons   application    ONLINE    ONLINE    rac1        ora.rac1.vip   application    ONLINE    ONLINE    rac1        ora....SM2.asm application    ONLINE    ONLINE    rac2        ora....C2.lsnr application    ONLINE    ONLINE    rac2        ora.rac2.gsd   application    ONLINE    ONLINE    rac2        ora.rac2.ons   application    ONLINE    ONLINE    rac2        ora.rac2.vip   application    ONLINE    ONLINE    rac2        ora.rawdb.db   application    ONLINE    ONLINE    rac1        ora....b1.inst application    ONLINE    ONLINE    rac1        ora....b2.inst application    ONLINE    ONLINE    rac2        ora.test.db    application    ONLINE    ONLINE    rac1        ora....t1.inst application    ONLINE    ONLINE    rac1        ora....t2.inst application    ONLINE    ONLINE    rac2

Restart the CRS service. If OCR is lost, the service cannot be disabled by running the command.

[[email protected] oracle]# crsctl stop crsOCR initialization failed accessing OCR device: PROC-26: Error while accessing the physical storage Operating System error [No such file or directory]

Restart the server

[[email protected] ~]# rebootBroadcast message from root (pts/0) (Tue Aug 26 15:13:44 2014):The system is going down for reboot NOW![[email protected] ~]# rebootBroadcast message from root (pts/0) (Tue Aug 26 15:14:20 2014):The system is going down for reboot NOW!

Start CRS, although the prompt will start, but never get up, at this time we need to suspect that OCR is damaged

[[email protected] oracle]# crsctl start crsAttempting to start CRS stack The CRS stack will be started shortly

Run the ocrcheck command to check OCR. The OCR cannot be found.

[[email protected] oracle]# ocrcheckPROT-602: Failed to retrieve data from the cluster registry

Use the find command to find the OCR of the current backup. If the OCR automatic backup path is not changed, the default path is under $ crs_home/CDATA/CRS/on the master node.

[[email protected] ~]$ find /oracle -name *.ocr*/oracle/app/oracle/product/10.2.0/crs/cdata/crs/backup00.ocr/oracle/app/oracle/product/10.2.0/crs/cdata/crs/day_.ocr

Use the backup OCR for recovery. OCR can be restored online.

For RAC of ocfs, you must first create an OCR file with the same name as the previous one, and then restore the file.

If the OCR file is not created, try to restore it:

[[email protected] crs]# ocrconfig -restore backup00.ocrPROT-16: Internal Error

The OCR file name is different from the previous one:

[[email protected] crs]# ocrconfig -restore backup00.ocrPROT-16: Internal Error

Create an OCR file with the same name as before and restore it:

[[email protected] crs]# ocrconfig -restore backup00.ocr

Start CRS and view Resource Status

[[email protected] crs]# crs_stat -tName           Type           Target    State     Host        ------------------------------------------------------------ora....b1.inst application    ONLINE    ONLINE    rac1        ora....b2.inst application    ONLINE    ONLINE    rac2        ora.asmdb.db   application    ONLINE    ONLINE    rac2        ora....SM1.asm application    ONLINE    ONLINE    rac1        ora....C1.lsnr application    ONLINE    ONLINE    rac1        ora.rac1.gsd   application    ONLINE    ONLINE    rac1        ora.rac1.ons   application    ONLINE    ONLINE    rac1        ora.rac1.vip   application    ONLINE    ONLINE    rac1        ora....SM2.asm application    ONLINE    ONLINE    rac2        ora....C2.lsnr application    ONLINE    ONLINE    rac2        ora.rac2.gsd   application    ONLINE    ONLINE    rac2        ora.rac2.ons   application    ONLINE    ONLINE    rac2        ora.rac2.vip   application    ONLINE    ONLINE    rac2        ora.rawdb.db   application    ONLINE    ONLINE    rac2        ora....b1.inst application    ONLINE    ONLINE    rac1        ora....b2.inst application    ONLINE    ONLINE    rac2        ora.test.db    application    ONLINE    ONLINE    rac2        ora....t1.inst application    ONLINE    ONLINE    rac1        ora....t2.inst application    ONLINE    ONLINE    rac2 

 

Import and export of OCR

Manual export OCR, OCR can be used Online Export

[[email protected] crs_data]# ocrconfig -export /oradata/crs_data/ocr.dat.bak -s online

Export OCR backup files must be imported for recovery. Similarly, ocfs RAC needs to create files first.

$ ocrconfig -import /oradata/crs_data/ocr.dat.bak

 

OCR backup and recovery