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Date:      Tue, 7 Dec 2010 17:18:11 -0800
From:      David Brodbeck <gull@gull.us>
To:        freebsd-fs@freebsd.org
Subject:   Re: zfs snapshots.
Message-ID:  <AANLkTinrmKj6kJ1N0-Ro6+kA04_KKRXCvdECT45zVyqA@mail.gmail.com>
In-Reply-To: <7554F69B-0E03-42E3-8BB2-FD7CFE19805A@pean.org>
References:  <4CF017C8-9D3C-483D-B508-5BF70E32AA14@pean.org> <4CF949B0.5060405@obsysa.net> <E629A6C6-2784-41B5-9979-A407464C52F0@pean.org> <20101203210045.GB7429@lor.one-eyed-alien.net> <7554F69B-0E03-42E3-8BB2-FD7CFE19805A@pean.org>

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On Fri, Dec 3, 2010 at 1:25 PM, Peter Ankerst=E5l <peter@pean.org> wrote:
>>>>
>>>
>>> Yes, this is correct. But it still uses up 10MB from the parent
>>> filesystem. This is a problem if you use both snapshots and quotas.
>>> (and use alot of snapshots)
>>
>> You many be able to use the refquota attribute instead of quota unless
>> you're trying to place quotas on filesystem hiearchies.
>>
>> -- Brooks
>
> Oh. Thanks. How could I miss that.. It seems I have to change some of the
> "logic" in my setup for this to work as needed but overall this will work=
 fine.

If this is an NFS share, you might want to test what happens if you
set a refquota, then exceed it.  I know on OpenSolaris there have been
some bugs where you get a 'no space left on device' when you try to rm
files, in that situation, making it difficult for a user to recover
from exceeding their quota.  It's possible FreeBSD doesn't suffer from
this, but you should test it if it's likely to come up.



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