[gpfsug-discuss] mmchqos and already running maintenance commands

[Marc A Kaplan]

mmchqos fs --enable ...  maintenance=1234iops ...

Will apply the new settings to all currently running and future 
maintenance commands.

There is just a brief delay (I think it is well under 30 seconds) for the 
new settings to be propagated and become effective on each node.

You can use `mmlsqos fs --seconds 70` to observe performance.

Better, install gnuplot and run samples/charts/qosplot.pl or hack the 
script to push the data into your favorite plotter.


--marc



From:   "Buterbaugh, Kevin L" <Kevin.Buterbaugh at Vanderbilt.Edu>
To:     gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:   07/29/2016 11:57 AM
Subject:        [gpfsug-discuss] mmchqos and already running maintenance 
commands
Sent by:        gpfsug-discuss-bounces at spectrumscale.org



Hi All, 

Looking for a little clarification here … in the man page for mmchqos I 
see:

*  When you change allocations or mount the file system, a brief
   delay due to reconfiguration occurs before QoS starts applying
   allocations.

If I’m already running a maintenance command and then I run an mmchqos 
does that mean that the already running maitenance command will adjust to 
the new settings or does this only apply to subsequently executed 
maintenance commands?

Thanks…

—
Kevin Buterbaugh - Senior System Administrator
Vanderbilt University - Advanced Computing Center for Research and 
Education
Kevin.Buterbaugh at vanderbilt.edu - (615)875-9633


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