[gpfsug-discuss] Placement policies and copies

[Marc A Kaplan]

From the Advanced Admin book:

File placement rules:

RULE [’RuleName’]
SET POOL ’PoolName’
[LIMIT (OccupancyPercentage)]
[REPLICATE (DataReplication)]
[FOR FILESET (’FilesetName’[,’FilesetName’]...)]
[WHERE SqlExpression]


So, use REPLICATE(1)

That's for new files as they are being created.

You can use mmapplypolicy and the MIGRATE rule to change the replication 
factor of files that already exist.

--marc of GPFS.



From:   "Simon Thompson (Research Computing - IT Services)" 
<S.J.Thompson at bham.ac.uk>
To:     gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:   11/30/2015 11:27 AM
Subject:        [gpfsug-discuss] Placement policies and copies
Sent by:        gpfsug-discuss-bounces at spectrumscale.org



Hi,

I have a file system which has the default number of data copies set to 2.

I now have some data Id like to have which only has 1 copy made. I know 
that files and directories don't inherit 1 copy based on their parent.

Can I do this with a placement rule to change the number of copies to 1?

I don't really want to have to find the file afterwards and fix up as that 
requires an mmrestripefs to clear the second copy.

Or if I have a pool which only has nsd disks in a single failure group and 
use a placement policy for that, would that work? Or will gpfs forever 
warn me that due to fs changes I have data at risk?

Thanks

Simon
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