[gpfsug-discuss] ILM and Backup Question

[Stephan Graf]

We are running the mmbackup on an AIX system
oslevel -s
6100-07-10-1415
Current GPFS build: "4.1.0.8 ".

So we only use one node for the policy run.

Stephan

On 10/26/15 22:12, Wayne Sawdon wrote:

> From: Stephan Graf <st.graf at fz-juelich.de><mailto: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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