Hi Martin,

Le 07/10/2012 16:48, Martin Steigerwald a écrit :

Where is this volume pool located on? On which drive(s)?

All the concerned machines are laptops with a single physical HD...

This could be 100 or more subvolumes / snapshots.

Maybe slowness could be related to this one.

That's a good estimation... I'm not sure if there is any theoretical
reason why the number of snapshots of a given volume might slow down
access to this volume ?

It would be good to have some capture of this slowness with

vmstat 10

iostat -xd 10 /your/device

I will try to give you some figures. But when the machine starts really
crawling, it becomes very hard to start any new program unless it's
"finished being slow", so that's not so easy...

Also how much RAM has the machine? What does free -m / cat /proc/meminfo 
tell.

The 4 concerned machines have either 4GB or 2GB RAM.  None is heavily
loaded as far as RAM is concerned (just booting into a standard Ubuntu
GUI and then accessing emailn, browser, office applications etc.)

Kind regards.

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