Sunday, December 23, 2007

Making 10g RAC ready for worst

focussing on vulenrable part of RAC
RAC gives you high availablity and performance,but what if you dont have clustered disks and your voting disk or cluster registry fails. from 10g R2 these can be mirrored but you should regularly backup and voting/ocr disk.Also you should be heedfull to run integrity test.


manual mirriring of voting disk be

query for current voting disk :
C:\>crsctl query css votedisk
0. 0 P:\cdata\crs\votedsk

located 1 votedisk(s).

adding redundant voting disk:
C:\>crsctl add css votedisk Q:\cdata\crs\votedsk
Cluster is not in a ready state for online disk addition

C:\>crsctl add css votedisk Q:\cdata\crs\votedsk -force
Now formatting voting disk: Q:\cdata\crs\votedsk
successful addition of votedisk Q:\cdata\crs\votedsk.

C:\>crsctl query css votedisk
0. 0 P:\cdata\crs\votedsk
1. 0 Q:\cdata\crs\votedsk

located 2 votedisk(s).

C:\>crsctl add css votedisk O:\cdata\crs\votedsk
Cluster is not in a ready state for online disk addition

investigate ( is CRS running/stopped)

C:\>crsctl add css votedisk O:\cdata\crs\votedsk -force
Now formatting voting disk: O:\cdata\crs\votedsk
successful addition of votedisk O:\cdata\crs\votedsk.


running integrity test
C:\>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.

Uniqueness check for OCR device passed.

Checking the version of OCR...
OCR of correct Version "2" exists.

Checking data integrity of OCR...
Data integrity check for OCR passed.

OCR integrity check passed.

Verification of OCR integrity was successful.

6 comments:

Steve Howard said...

I just found this post while looking for something else. If anyone finds this, do *not* issue the -force option. There is a well known note on Metalink that states this will corrupt your OCR.

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