[gpfsug-discuss] GPFS snapshot cron job

[Eric Horst]

It's easy if you use a chronologically sortable naming scheme. We use
YYYY-MM-DD-hhmmss. This is a modified excerpt from the bash script I
use. The prune function takes an arg of the number of snapshots to
keep.

SNAPROOT=/grfs/ud00/.snapshots

function prune () {
PCPY=$1
for s in $(/bin/ls -d "$SNAPROOT"/????-??-??-?????? | head --lines=-$PCPY); do
  mmdelsnapshot $FSNAME $s

  if [ $? != 0 ]; then
    echo ERROR: there was a mmdelsnapshot problem $?
    exit
  else
    echo Success
  fi
done
}
echo Pruning snapshots
prune 12

-Eric


On Wed, Feb 6, 2013 at 10:38 AM, Stuart Barkley <stuartb at 4gh.net> wrote:
> I'm new on this list.  It looks like it can be useful for exchanging
> GPFS experiences.
>
> We have been running GPFS for a couple of years now on one cluster and
> are in process of bringing it up on a couple of other clusters.
>
> One thing we would like, but have not had time to do is automatic
> snapshots similar to what NetApp does.  For our purposes a cron job
> that ran every 4 hours that creates a new snapshot and removes older
> snapshots would be sufficient.  The slightly hard task is correctly
> removing the older snapshots.
>
> Does anyone have such a cron script they can share?
>
> Or did I miss something in GPFS that handles automatic snapshots?
>
> Thanks,
> Stuart Barkley
> --
> I've never been lost; I was once bewildered for three days, but never lost!
>                                         --  Daniel Boone
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