[gpfsug-discuss] Specifying nodes in commands

[Marc A Kaplan]

mmapplypolicy ... -N nodeClass ... 
  will use the nodes in nodeClass as helper nodes to get its work done.

mmdsh -N nodeClass command ... 
  will run the SAME command on each of the nodes -- probably not what you 
want to do with mmapplypolicy.

To see more about what mmapplypolicy is doing use  options -d 1 (debug 
info) 

If you are using -N because you have a lot of files to process, you should 
also use -g /some-gpfs-temp-directory (see doc)

If you are running a small test case, it may happen that you don't see the 
helper nodes doing anything, because there's not enough time and work to 
get them going...

For test purposes you can coax the helper nodes into action with:

options -B 1  -m 1 so that each helper node only does one file at a time. 



From:   "Chase, Peter" <peter.chase at metoffice.gov.uk>
To:     "'gpfsug-discuss at spectrumscale.org'" 
<gpfsug-discuss at spectrumscale.org>
Date:   11/10/2017 11:18 AM
Subject:        [gpfsug-discuss] Specifying nodes in commands
Sent by:        gpfsug-discuss-bounces at spectrumscale.org



Hello all,

I'm running a script triggered from an ILM external list rule.

The script has the following command in, and it isn't work as I'd expect:
/usr/lpp/mmfs/bin/mmapplypolicy /gpfs1/aws -N cloudNode -P 
/gpfs1/s3upload/policies/migration.policy --scope fileset

I'd expect the mmapplypolicy command to run the policy on all the nodes in 
the cloudNode class, but it doesn't, it runs on the node that triggered 
the script.

However, the following command does work as I'd expect:
/usr/lpp/mmfs/bin/mmdsh -N cloudNode /usr/lpp/mmfs/bin/mmapplypolicy 
/gpfs1/aws -P /gpfs1/s3upload/policies/migration.policy --scope fileset

Can any one shed any light on this? Have I just misconstrued how 
mmapplypolicy works?

Regards,

Peter Chase
GPCS Team
Met Office  FitzRoy Road  Exeter  Devon  EX1 3PB  United Kingdom
Tel: +44 (0)1392 886921
Email: peter.chase at metoffice.gov.uk Website: www.metoffice.gov.uk 

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