Snapshot usage guidelines (to avoid stability issues)

[Cristian KLEIN]

Kostik Belousov wrote:
> On Wed, Jun 20, 2007 at 06:26:26PM +0200, Espen Skoglund wrote:
>> Hi,
>>
>> A couple of days ago I decided to start using snapshots on my system.
>> Knowing that the functionality has been available for quite some time
>> now I (apparently wrongly) assumed that it was ready for production
>> use.  My bad.
>>
>> My system, a 6-STABLE from week and a half ago, uses two 250GB
>> gstriped disks and has about 4-5 snapshots on one 215GB UFS partiton.
>> This morning I learned that things had gone terribly wrong during some
>> nightly cronjobs, hanging the whole system.  Suspecting that snapshots
>> were the culprit I soon learned after some investigation that the
>> snapshot functionality wasn't nearly as stable as I had hoped for.
>>
>> Looking at PRs and mailing lists there seems to be mainly two
>> outstanding stability issues with snapshots: a) snapshotted fs running
>> full, and b) deleting large amount of files on an fs with multiple
>> snapshots.  The former issue, while certainly annoying, one could be
>> able to work around.  The latter issue, on the other hand, seems more
>> like a definite show stopper.
>>
>> Am I right in inferring that the two above cases are main issues with
>> snaphots at this time, or are there other known gotchas that I have to
>> look out for.
> About the issue b). Are you system sources before or after 2007-06-11
> 10:53:48 UTC ? Or simply show me the version of sys/ufs/ffs/ffs_snapshot.c.
> 
> If it is less then 1.103.2.24, see developers handbook for instruction on
> reporting deadlocks.
> 

Do you think that 1.103.2.24 might solve this
http://lists.freebsd.org/pipermail/freebsd-fs/2007-May/003161.html ?