[gpfsug-discuss] AFM Question

Shankar Balasubramanian shankbal at in.ibm.com
Tue Apr 19 06:47:11 BST 2016


SW mode does not support failover. IW does, so this will not work. 


Best Regards,
Shankar Balasubramanian
AFM & Async DR Development
IBM Systems
Bangalore - Embassy Golf Links 
India





From:   Vic Cornell <viccornell at gmail.com>
To:     gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:   04/18/2016 07:13 PM
Subject:        [gpfsug-discuss] AFM Question
Sent by:        gpfsug-discuss-bounces at spectrumscale.org



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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