Re: [gpfsug-discuss] Migration policy confusion

Daniel Kidger Thu, 07 Jul 2016 06:11:35 -0700

Mark,

For performance reasons, mmdf gets its data updated asynchronously.

Did you try waiting a few minutes?

Daniel

Dr Daniel Kidger
IBM Technical Sales Specialist
Software Defined Solution Sales

+44-07818 522 266
[email protected]

----- Original message -----
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Subject: [gpfsug-discuss] Migration policy confusion
Date: Thu, Jul 7, 2016 2:00 PM

Hello all, I’m struggling trying to understand tiering and policies in general in SpecScale. I have a single filesystem with two pools defined (system, GOLD). The GOLD pool is made up of some faster disks than the system pool. The policy I’m trying to get working is as follows

RULE 'go_gold'

    MIGRATE

        FROM POOL 'system'

    TO POOL 'GOLD'

        WHERE (LOWER(NAME) LIKE '%.perf')

I’m simply trying to get the data to move the NDS’s in GOLD pool.

When I do an mmapplypolicy, mmlsattr shows that it’s now in the GOLD pool but when I do a mmdf the data shows 100% free still. I tried a mmrestripefs as well and no change to the mmdf output. Am I missing something here? Is this just normal behavior and the blocks will get moved at some other time? I guess I was expecting instant gratification and that those files would have been moved to the correct NSD.

Mark R. Bush | Solutions Architect
Mobile: 210.237.8415 | [email protected]
Sirius Computer Solutions | www.siriuscom.com
10100 Reunion Place, Suite 500, San Antonio, TX 78216

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Re: [gpfsug-discuss] Migration policy confusion

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