[gpfsug-discuss] Running mmcheckquota on a file system with 1.3B files

[IBM Spectrum Scale]

Bob, like most questions of this time I think the answer depends on a 
number of variables.  Generally we do not recommend running the 
mmcheckquota command during the peak usage of your Spectrum Scale system. 
As I think you know the command will increase the IO to the NSDs that hold 
metadata and the number of NSDs that hold metadata will contribute to the 
time it takes for the command to complete, i.e. more metadata NSDs should 
improve the overall execution time.

Regards, The Spectrum Scale (GPFS) team

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From:   "Oesterlin, Robert" <Robert.Oesterlin at nuance.com>
To:     gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:   08/16/2019 11:57 AM
Subject:        [EXTERNAL] [gpfsug-discuss] Running mmcheckquota on a file 
system with 1.3B        files
Sent by:        gpfsug-discuss-bounces at spectrumscale.org



I want to run mmcheckquota on a file system I have on my ESS. It has 1.3B 
files. Obviously it will take a long time, but I’m looking for anyone who 
has guidance running this command on a large file system, what I should 
expect for IO load. 
 
- Should I set QOS to minimize impact? 
- Run directly on the ESS IO nodes, or some other nodes?
 
Bob Oesterlin
Sr Principal Storage Engineer, Nuance
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