Change the GPFS tiebreaker disk by running the following commands as the root user:  

# db2cluster -cfs -set -tiebreaker -majority The quorum type has been successfully change to GLYPH<145>majorityGLYPH<146>. # db2cluster -cfs -set -tiebreaker -disk /dev/hdisk151/ The quorum has been successfully changed to GLYPH<145>diskGLYPH<146>. 

Exit maintenance mode by running the following commands as the root user:  

# db2cluster -cm -exit -maintenance -all Host GLYPH<145>hostname1GLYPH<146> has exited maintenance mode. Domain GLYPH<145>db2domain_20130718132645GLYPH<146> has been started. # db2cluster -cfs -exit -maintenance -all The shared file system has successfully exited maintenance mode. 

Start the DB2 instance by running the following command as the DB2 instance user:  

$ db2start instance on hostname1 $ db2start instance on hostname2 $ db2start 

## Changing the TSA tiebreaker disk 

Finally, the TSA tiebreaker disk should be changed to a disk from the new EMC storage. This work can be done while the DB2 pureScale cluster is online. In the scenario, a new disk that is named hdisk200 from EMC storage is set as new TSA tiebreaker. 

Complete the following steps: 

Check the current TSA tiebreaker disk by running the following command as the DB2 instance user or  the root user: 

$ db2cluster -cm -list -tiebreaker  The current quorum device is of type Disk with the following specifics: DEVICE=/dev/hdisk2. 

Change the TSA tiebreaker disk by running the following command as the root user:  

# db2cluster -cm -set -tiebreaker -disk /dev/hdisk200 Configuring quorum device for domain GLYPH<145>db2domain_20130718132645GLYPH<146> GLYPH<133> Configuring quorum device for domain GLYPH<145>db2domain_20130718132645GLYPH<146> was successful. 

## Summary 

Consider the following points: 

Multiple disks can be added to file systems by running one command, and multiple commands  against multiple file systems can be run in parallel. 

In the process of adding disks to a GPFS file system, there might be a delay when the applications  access the file system during the allocation of disk maps. 

Depending on the storage vendor product, GPFS rebalancing might happen when you add disks. You  must confirm whether the GPFS rebalancing was done to the new disks; if not, the GPFS rebalancing must be done manually. 

