[gpfsug-discuss] ILM and Backup Question

Wayne Sawdon wsawdon at us.ibm.com
Mon Oct 26 21:12:55 GMT 2015



> From: Stephan Graf <st.graf at fz-juelich.de>
>
> For backup we use mmbackup (dsmc)
>     for the user HOME directory (no ILM)
>     #120 mio files => 3 hours get candidate list + x hour backup

That seems rather slow. What version of GPFS are you running? How many
nodes are you using? Are you using a "-g global shared directory"?

The original mmapplypolicy code was targeted to a single node, so by
default it still runs on a single node and you have to specify -N to run it
in parallel.  When you run multi-node there is a "-g" option that defines a
global shared directory that must be visible to all nodes specified in the
-N list.  Using "-g" with "-N" enables a scale-out parallel algorithm that
substantially reduces the time for candidate selection.

-Wayne
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