[gpfsug-discuss] AFM Question

[Vic Cornell]

Hi All,

Is there a bandwidth efficient way (downtime is allowed) to reverse the relationship between HOME and CACHE in a single writer AFM relationship?


If it is not immediately obvious why this might be useful, see the following scenario:

Fileset A is a GPFS fileset which is acting as CACHE for a single writer HOME on fileset B located on a separate filesystem.

The system hosting A fails and all data on fileset A is lost.

Admin uses fileset B as a recovery volume and users read and write data to B until the system hosting A is recovered, albeit without data.

Admin uses mmafmctl to “failover” AFM relationship to a new fileset on A, all data are copied from B to A over time and users continue to access the data via B.

So is there a bandwidth efficient way (downtime is allowed) to reverse the relationship between A and B such that the replication flow is as it was to start with?

Cheers,

Vic

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