[gpfsug-discuss] Specifying nodes in commands

[Marc A Kaplan]

My guess is you have some expectation of how things "ought to be" that 
does not match how things actually are.
If you haven't already done so, put some diagnostics into your script, 
such as 

env
hostname
echo "my args are: $*"

And run 

mmapplypolicy with an explicit node list:

   mmapplypolicy /some/small-set-of-files  -P /mypolicyfile -N 
node1,node2,node3   -I test -L 1 -d 1

And see how things go


Hmmm... reading your post again... It seems perhaps you've got some things 
out of order or again, incorrect expectations or model of how the this 
world works...

mmapplypolicy reads your policy rules and scans the files and calls the 
script(s) you've named in the EXEC options of your EXTERNAL rules

The scripts are expected to process file lists -- NOT call mmapplypolicy 
again...

Refer to examples in the documentation, and in samples/ilm  - and try 
them!

--marc





From:   "Chase, Peter" <peter.chase at metoffice.gov.uk>
To:     "'gpfsug-discuss at spectrumscale.org'" 
<gpfsug-discuss at spectrumscale.org>
Date:   11/13/2017 06:15 AM
Subject:        Re: [gpfsug-discuss] Specifying nodes in commands
Sent by:        gpfsug-discuss-bounces at spectrumscale.org



Hi Marc,

Thanks for your response, there's some handy advice in there that I'll 
look at further.

I'm still struggling a bit with mmapplypolicy and it's -N option.
I've changed my external list command to point at a script, that script 
looks for "LIST" as the first argument, and runs 
"/usr/lpp/mmfs/bin/mmapplypolicy /gpfs1/aws -d 1 -N cloudNode -P 
/gpfs1/s3upload/policies/migration.policy 
>>/gpfs1/s3upload/external-list.log 2>&1".

If the script is run from the command line on a node that's not in 
cloudNode class it works without issue and uses nodes in the cloudNode 
class as helpers, but if the script is called from the active policy, 
mmapplypolicy runs, but seems to ignore the -N and doesn't use the 
cloudNode nodes as helpers and instead seems to run locally (from which 
ever node started the active policy).

So now my questions is: why does the -N option appear to be honoured when 
run from the command line, but not appear to be honoured when triggered by 
the active policy?

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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