Question & Answer
Question
What steps should be taken to change the physical disk storage of a GPFS file system in a DB2 pureScale environment?
Answer
To change the underlying physical disks used for GPFS file system data storage, perform the following steps:
- Add the new disks to the GPFS file system until the file system is doubled in size by issuing the following command as root for each disk:
db2cluster -cfs -add -filesystem <fs-name> -disk <disk-path>
Note: The above command should be run sequentially for each disk.
- Repeat the first step on each file system.
- If a GPFS disk tiebreaker is in use, update the disk used by following these instructions:
a. Stop all applications
b.db2stop
c.db2stop instance on <host>
(on all hosts)
d.db2cluster -cm -enter -maintenance -all
e.db2cluster -cfs -enter -maintenance -all
f.db2cluster -cfs -set -tiebreaker -majority
g.db2cluster -cfs -set -tiebreaker -disk <disk-path>
h.db2cluster -cm -exit -maintenance -all
i.db2cluster -cfs -exit -maintenance -all
j.db2start
k. Restart applications
- If a TSA disk tiebreaker is in use, update the disk by issuing the following command as root:
db2cluster -cm -set -tiebreaker -disk <disk-path>
- Remove the old disks from the file system by issuing the following command as root for each disk:
db2cluster -cfs -remove -filesystem <fs-name> -disk <disk-path>
Note: The above command should be run sequentially for each disk.
- Repeat the fifth step on each file system
Optional: The GPFS filesystems can be rebalanced by issuing the following command as root:
db2cluster -cfs -rebalance -filesystem <fs-name>
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Document Information
Modified date:
16 June 2018
UID
swg21633330