On Mar 9, 2011, at 4:05 PM, Tom Fanning wrote:
> On Wed, Mar 9, 2011 at 10:37 PM, Peter Jeremy
> <peter.jer...@alcatel-lucent.com> wrote:
>> On 2011-Mar-10 05:50:53 +0800, Tom Fanning <m...@tomfanning.eu> wrote:
>>> I have a FreeNAS 0.7.2 box, based on FreeBSD 7.3-RELEASE-p1, running
>>> ZFS with 4x1TB SATA drives in RAIDz1.
>>>
>>> I appear to have lost 1TB of usable space after creating and deleting
>>> a 1TB sparse file. This happened months ago.
>>
>> AFAIR, ZFS on FreeBSD 7.x was always described as experimental.
>>
>> This is a known problem (OpenSolaris bug id 6792701) that was fixed in
>> OpenSolaris onnv revision 9950:78fc41aa9bc5 which was committed to
>> FreeBSD as r208775 in head and r208869 in 8-stable. The fix was never
>> back-ported to 7.x and I am unable to locate any workaround.
>>
>>> - Exported the pool from FreeBSD, imported it on OpenIndiana 148 -
>>> but not upgraded - same problem, much newer ZFS implementation. Can't
>>> upgrade the pool to see if the issue goes away since for now I need a
>>> route back to FreeBSD and I don't have spare storage.
>>
>> I thought that just importing a pool on a system with the bugfix would
>> free the space. If that doesn't work, your only options are to either
>> upgrade to FreeBSD 8.1-RELEASE or later (preferably 8.2 since there
>> are a number of other fairly important ZFS fixes since 8.1) and
>> upgrade your pool to v15 or rebuild your pool (via send/recv or similar).
>>
>> --
>> Peter Jeremy
>
> Well I never. Just by chance I did zfs list -t snapshot, and now it
> shows a 1TB snapshot which it wasn't showing before.
There was a change where snapshots are no longer shown by default.
This can be configured back to the old behaviour setting the zpool
"listsnapshots" property to "on"
Otherwise, you need to use the "-t snapshot" list.
But, a much better method of tracking this down is to use:
zfs list -o space
That will show the accounting for all dataset objects.
-- richard
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