Dear all,

Since a while we are experiencing an issue when dealing with snapshots.
Basically what happens is that when deleting a fileset snapshot (and maybe also 
when creating new ones) the filesystem becomes inaccessible on the clients for 
the duration of the operation (can take a few minutes).

The clients and the storage are on two different clusters, using remote cluster 
mount for the access.

On the log files many lines like the following appear (on both clusters):
Snapshot whole quiesce of SG perf from xbldssio1 on this node lasted 60166 msec

By looking around I see we're not the first one. I am wondering if that's 
considered an unavoidable part of the snapshotting and if there's any tunable 
that can improve the situation. Since when this occurs all the clients are 
stuck and users are very quick to complain.

If it can help, the clients are running GPFS 5.1.2-1 while the storage cluster 
is on 5.1.1-0.

Thanks,
Ivano
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