Technical Blog Post
Abstract
75 ways to demystify DB2 #51: Techtip: How to change disk tiebreakers in Purescale setup
Body
Run steps as instance owner :
db2cluster -cfs -list -tiebreaker
db2cluster -cm -list -tiebreaker
Make sure the CFS and CM level tibreakers are type disk.
Stop all the applications and deactive the databases.
db2stop
db2stop instance on <member-host> [repeat for all member hosts]
db2stop instance on <cf-host> [repeat for all CF hosts]
Run steps as cluster service admin (root) :
db2cluster -cm -enter -maintenance -all
db2cluster -cfs -enter -maintenance -all
db2cluster -cfs -set -tiebreaker -majority
db2cluster -cfs -set -tiebreaker -disk <exact-disk-path, example /dev/hdisk5>
db2cluster -cm -exit -maintenance
db2cluster -cfs -exit -maintenance -all
db2cluster -cm -set -tiebreaker -majority
db2cluster -cm -set -tiebreaker -disk <exact-disk-path, example /dev/hdisk4>
Run as db2 instance owner:
db2start instance on <cf-host> [repeat for all CF hosts]
db2start instance on <member-host> [repeat for all member hosts]
db2start
Then, check the tibreakers to verify,
db2cluster -cfs -list -tiebreaker
db2cluster -cm -list -tiebreaker
UID
ibm11140988