[gpfsug-discuss] mmapplypolicy didn't migrate everything it should have - why not?

[Bryan Banister]

Hey Marc,

I'm having some issues where a simple ILM list policy never completes, but I have yet to open a PMR or enable additional logging.  But I was wondering if there are known reasons that this would not complete, such as when there is a symbolic link that creates a loop within the directory structure or something simple like that.

Do you know of any cases like this, Marc, that I should try to find in my file systems?

Thanks in advance!
-Bryan

From: gpfsug-discuss-bounces at spectrumscale.org [mailto:gpfsug-discuss-bounces at spectrumscale.org] On Behalf Of Marc A Kaplan
Sent: Wednesday, April 19, 2017 9:37 AM
To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Subject: Re: [gpfsug-discuss] mmapplypolicy didn't migrate everything it should have - why not?

Well  I'm glad we followed Mr. S. Holmes dictum which I'll paraphrase... eliminate the impossible and what remains, even if it seems improbable, must hold.

BTW - you may want to look at  mmclone.  Personally, I find the doc and terminology confusing, but mmclone was designed to efficiently store copies and near-copies of large (virtual machine) images.  Uses copy-on-write strategy, similar to GPFS snapshots, but at a file by file granularity.

BBTW - we fixed directories - they can now be huge (up to about 2^30 files) and automagically, efficiently grow and shrink in size.  Also small directories can be stored efficiently in the inode.  The last major improvement was just a few years ago.  Before that they could be huge, but would never shrink.


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