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Status Future consideration
Workspace Storage Scale (formerly known as GPFS)
Created by Guest
Created on Apr 1, 2021

RELATED IDEAS

Support ILM pool migrations in stretched cluster without killing WAN

See this idea on ideas.ibm.com

Currently when migrating files between replicated storage pools in a stretched cluster, intense load is experienced on the WAN. This is because the migration is essentially a copy of the files (hopefully?? respecting readReplicaPolicy) and the writes are all synchronous - in other words, the data migrated is re-replicated.

Given that both sites already have synchronized data, it is reasonable customer expectation that pool migration could simply move data locally, sparing the WAN.

We could almost accomplish this today this way: Bring down one site. Run mmapplypolicy on surviving site. Bring up the second site and start disks. Bring down the first site and restripe, correcting pool memberships. Bring the first site back up and start disks. But this would be very painful... If it were even possible to confine mmapplypolicy and mmrestripefs to only operate on some set of disks or failuregroups, that might be a start at a better procedure than I've outlined. But ultimately it would be nice of mmapplypolicy could handle this itself. (It would also be necessary to make sure worker threads are running in the same site as the disks.)

Idea priority High

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