[gpfsug-discuss] Placement policies and copies
Marc A Kaplan
makaplan at us.ibm.com
Mon Nov 30 17:58:23 GMT 2015
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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