On 04/22/2010 09:48 PM, Stuart Jansen wrote:
> On Thu, 2010-04-22 at 21:40 -0600, Michael Torrie wrote:
>> On ZFS, snapshots count against your quota, as they should.
>> This occasionally causes problems when a user runs out of space and then
>> deletes files, thinking he's freeing up space.
> 
> Wait, hang on, users can't just delete files to get back under quota?

Sure.  Then wait 7 days for my script to expire old snapshots. :)

> Am I the only one with warning bells going off in his head?

It is a major issue (albeit not one that comes up very often).  Maybe it
would help if ZFS allowed a user to create or destroy snapshots owned by
the user.  But then again, that's problematic as there's really no
correlation between user and file system (and thus no per-user quotas
either).  I'm not sure how to get around the problem, though.  You could
make snapshots not part of FS's quota. but since snapshots are just COW
pages linked to the original pages, they would seem to be, by
definition, children of the file system in question, and thus subject to
its quota.  A hard one.


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