Post-upgrade task for cluster using IBM Spectrum Scale replication
During or after the pureScale instance upgrade from a version prior to V11.5, you are required to manually convert the tiebreaker redundancy group ID from 3 to 4. This task is an online operation.
Before you begin
- Ensure that you have root access before you begin this task.
About this task
The following procedure describes the steps to convert a tiebreaker redundancy group ID from 3 to 4 in a IBM Spectrum Scale replication.
Verify if any tiebreaker disk in the file system is associated with 3 as its redundancy group ID using the following command run under root:
/dev/xxx, the user can issue the command "
/usr/lpp/mmfs/bin/mmlsfs all -A" to find
If the redundancy group ID 3 is used for the tiebreaker, run the following command to convert it from 3 to 4:
Create a stanza file with content:
%nsd: nsd=<NsdName> failureGroup=4
Apply the redundancy group ID change using the stanza file:
/usr/lpp/mmfs/bin/mmchdisk <fs-name> change -F <stanza file>
Rebalance the file system using db2cluster utility:
db2cluster -cfs -rebalance -filesystem <fs-name>Note: Rebalancing of data can be I/O intensive and the duration depends on the size of data. It is recommended to run them at off-peak usage hours. The prefix `
/dev/` must be removed from the parameter.
./db2cluster -cfs -rebalance -filesystem db2fs1