[gpfsug-discuss] R: Question on changing mode on many files

[Dorigo Alvise (PSI)]

I have 5.0.4 for the moment (planned to be updated next year) and what I see is:

[root at sf-dss-1 tmp]# locate mmfind
/usr/lpp/mmfs/samples/ilm/mmfind
/usr/lpp/mmfs/samples/ilm/mmfind.README
/usr/lpp/mmfs/samples/ilm/mmfindUtil_processOutputFile.c
/usr/lpp/mmfs/samples/ilm/mmfindUtil_processOutputFile.sampleMakefile

Is that what you are talking about ?

Thanks,

   Alvise

Da: gpfsug-discuss-bounces at spectrumscale.org <gpfsug-discuss-bounces at spectrumscale.org> Per conto di Frederick Stock
Inviato: martedì 7 dicembre 2021 15:02
A: gpfsug-discuss at spectrumscale.org
Cc: gpfsug-discuss at spectrumscale.org
Oggetto: Re: [gpfsug-discuss] Question on changing mode on many files

If you are running on a more recent version of Scale you might want to look at the mmfind command.  It provides a find-like wrapper around the execution of policy rules.

Fred
_______________________________________________________
Fred Stock | Spectrum Scale Development Advocacy | 720-430-8821
stockf at us.ibm.com<mailto:stockf at us.ibm.com>


----- Original message -----
From: "Dorigo Alvise (PSI)" <alvise.dorigo at psi.ch<mailto:alvise.dorigo at psi.ch>>
Sent by: gpfsug-discuss-bounces at spectrumscale.org<mailto:gpfsug-discuss-bounces at spectrumscale.org>
To: "'gpfsug main discussion list'" <gpfsug-discuss at spectrumscale.org<mailto:gpfsug-discuss at spectrumscale.org>>
Cc:
Subject: [EXTERNAL] [gpfsug-discuss] Question on changing mode on many files
Date: Tue, Dec 7, 2021 8:53 AM


Dear users/developers/support,

I’d like to ask if there is a fast way to manipulate the permission mask of many files (millions).



I tried on 900k files and a recursive chmod (chmod 0### -R path) takes about 1000s, with about 50% usage of mmfsd daemon.

I tried with the perl’s internal function chmod that can operate on an array of files, and it takes about 1/3 of the previous method. Which is already a good result.



I’ve seen the possibility to run a policy to execute commands, but I would avoid to execute external commands through mmxargs, 1M of times; would you ?



Does anybody have any suggestion to do this operation with minimum disruption on the system ?



Thank you,



    Alvise
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