ORACLE LOCAL REGISTRY(OLR) contains node-specific information required by OHASD . Every node has its own dedicated OLR file.(not shared between the nodes).
As OCRs files are present in ASM diskgroup, While starting the CRS, it wont be able to Access OCR file to find the cluster resource information. Because at this point ASM instance would also be down. So at this point OLR file ( which is present at normal file system) is accessed to start the required resources.
1. The default location of OLR:
2.View the available backups of OLR:
$GRID_HOME/bin/ocrconfig -local -showbackup prod60-2 2017/02/06 13:10:06 /crsapp/app/oracle/product/grid12c/cdata/prod60-2/backup_20170206_131006.olr 0
2. Take the backup of OLR manually: ( Need to done from ROOT user)
root# /crsapp/app/oracle/product/grid12c/bin/ocrconfig -local -manualbackup prod60-2 2018/11/18 16:52:15 /crsapp/app/oracle/product/grid12c/cdata/prod60-2/backup_20181118_165215.olr 3059807995 prod60-2 2017/02/06 13:10:06 /crsapp/app/oracle/product/grid12c/cdata/prod60-2/backup_20170206_131006.olr 0
3. Verify integrity of the OLR
cluvfy comp olr Verifying OLR integrity Checking OLR integrity... Check of existence of OLR configuration file "/var/opt/oracle/olr.loc" passed Check of attributes of OLR configuration file "/var/opt/oracle/olr.loc" passed WARNING: This check does not verify the integrity of the OLR contents. Execute 'ocrcheck -local' as a privileged user to verify the contents of OLR. OLR integrity check passed Verification of OLR integrity was successful.
4. Check the current OLR location:
$GRID_HOME/bin/ocrcheck -local Status of Oracle Local Registry is as follows : Version : 4 Total space (kbytes) : 409568 Used space (kbytes) : 1108 Available space (kbytes) : 408460 ID : 1832119036 Device/File Name : /crsapp/app/oracle/product/grid12c/cdata/prod60-2.olr Device/File integrity check succeeded Local registry integrity check succeeded Logical corruption check succeeded
5. View OLR in text format:
$GRID_HOME/bin/ocrdump -local -stdout
6. Restore OLR from backup:
In case OLR is corrupted, Restore it from backup.
crsctl stop crs ocrconfig -local -restore /crsapp/app/oracle/product/grid12c/cdata/prod60-2/backup_20181118_165215.olr ocrconfig -local crsctl start crs
3 thoughts on “Oracle local registry(OLR) in RAC”
Thank you for such elaborated explanations.
Very helpful 🙂
Does GPNP required for starting UP ASM as part of Cluster startup
Gpnp profile is also required. i will explain about that in a new article