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Date:      Wed, 22 Jan 2014 14:37:32 +1300
From:      Matt Magoffin <matt@msqr.us>
To:        krichy@tvnetwork.hu
Cc:        freebsd-fs@freebsd.org
Subject:   Re: ZFS snapshot renames failing after upgrade to 9.2
Message-ID:  <F7C75A7F-ED28-4C0E-8A5F-677E3FE9AE8E@msqr.us>
In-Reply-To: <alpine.DEB.2.10.1312201716570.22349@krichy.tvnetwork.hu>
References:  <0C9FD4E1-0549-4849-BFC5-D8C5D4A34D64@msqr.us> <54D3B3C002184A52BEC9B1543854B87F@multiplay.co.uk> <333D57C6A4544067880D9CFC04F02312@multiplay.co.uk> <26053_1387447492_52B2C4C4_26053_331_1_20131219105503.3a8d1df3.gerrit.kuehn@aei.mpg.de> <20131219165549.9f2ca709.gerrit.kuehn@aei.mpg.de> <alpine.DEB.2.10.1312191718330.12885@krichy.tvnetwork.hu> <20131219174054.91ac617a.gerrit.kuehn@aei.mpg.de> <alpine.DEB.2.10.1312192007100.30378@krichy.tvnetwork.hu> <20131220100522.382a39ac.gerrit.kuehn@aei.mpg.de> <alpine.DEB.2.10.1312201010350.12244@krichy.tvnetwork.hu> <alpine.DEB.2.10.1312201716570.22349@krichy.tvnetwork.hu>
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[-- Attachment #1 --]
Hello,

I missed the continuation of this thread, but wanted to add in that this still happens for me (snapshot renames lead to unusable snapshots).

I recently updated to 9.2-p3, and after restarting the system my scripts were able to rename the existing snapshots as expected, but only one time. When my backup script attempted to rename the new snapshot and the older ones during its second run since the restart, it failed and ended up in the unusable state.

As for 9.1, I never had this problem in 9.1. It only started happening for me after updating to 9.2.

Kind regards,
Matt 

On Dec 21, 2013, at 5:18 AM, krichy@tvnetwork.hu wrote:

> Dear Gerrit,
> 
> The problem is that when renaming snapshots, the mounted snapshot is tried to be mounted again under a new name. Maybe, the rename code does not remount them to their proper position, that may be the problem.
> 
> I will look if I can check or fix it.
> 
> Did this work in 9.1?
> 
> Regards,
> 
> 
> Kojedzinszky Richard
> Euronet Magyarorszag Informatikai Zrt.
> 
>>> Date: Fri, 20 Dec 2013 10:05:22 +0100
>>> From: Gerrit Khn <gerrit.kuehn@aei.mpg.de>
>>> To: krichy@tvnetwork.hu
>>> Cc: freebsd-fs@freebsd.org
>>> Subject: Re: ZFS snapshot renames failing after upgrade to 9.2
>>> On Thu, 19 Dec 2013 20:08:22 +0100 (CET) krichy@tvnetwork.hu wrote about
>>> Re: ZFS snapshot renames failing after upgrade to 9.2:
>>> KH> So a simple renaming can cause your system to hang?
>>> No, it does not hang completely.
>>> Just the snapshots become unusable. This night, it happened again:
>>> ---
>>> root@shapeshifter:~ # ll /tank/git/.zfs/snapshot/
>>> ls: daily.6: Device busy
>>> total 33
>>> drwxr-xr-x  12 211   211    25 Dec 19 09:18 daily.0/
>>> drwxr-xr-x  12 211   211    25 Dec 19 00:00 daily.1/
>>> drwxr-xr-x  12 211   211    24 Dec 18 00:00 daily.2/
>>> drwxr-xr-x  12 211   211    24 Dec 17 00:00 daily.3/
>>> drwxr-xr-x  12 211   211    24 Dec 16 00:00 daily.4/
>>> drwxr-xr-x  12 211   211    24 Dec 14 00:00 daily.5/
>>> drwxr-xr-x  12 211   211    24 Dec 15 00:00 weekly.0/
>>> drwxr-xr-x  12 211   211    24 Dec  8 00:00 weekly.1/
>>> drwxr-xr-x  12 211   211    24 Dec  1 00:00 weekly.2/
>>> drwxr-xr-x  12 211   211    24 Nov 17 00:00 weekly.3/
>>> drwxr-xr-x  12 211   211    24 Nov 10 00:00 weekly.4/
>>> drwxr-xr-x   2 root  wheel   3 Oct 20 00:00 weekly.5/
>>> drwxr-xr-x   2 root  wheel   3 Oct  6 00:00 weekly.6/
>>> ---
>>> root@shapeshifter:~ # zfs list -r -t snapshot -o
>>> name,creation,used,referenced tank/git NAME
>>> CREATION                USED  REFER tank/git@weekly.6  Sun Oct  6  0:00
>>> 2013  42.6K  62.8K tank/git@weekly.5  Sun Oct 20  0:00 2013  42.6K  62.8K
>>> tank/git@weekly.4  Sun Nov 10  0:00 2013  29.5M   146G
>>> tank/git@weekly.3  Sun Nov 17  0:00 2013  27.1M   146G
>>> tank/git@weekly.2  Sun Dec  1  0:00 2013  26.3M   146G
>>> tank/git@weekly.1  Sun Dec  8  0:00 2013  27.3M   146G
>>> tank/git@daily.6   Sat Dec 14  0:00 2013  26.5M   147G
>>> tank/git@weekly.0  Sun Dec 15  0:00 2013  25.2M   147G
>>> tank/git@daily.5   Mon Dec 16  0:00 2013  24.7M   147G
>>> tank/git@daily.4   Tue Dec 17  0:00 2013  24.9M   147G
>>> tank/git@daily.3   Wed Dec 18  0:00 2013  25.7M   147G
>>> tank/git@daily.2   Thu Dec 19  0:00 2013  25.8M   147G
>>> tank/git@daily.1   Thu Dec 19  9:19 2013  25.0M   147G
>>> tank/git@daily.0   Fri Dec 20  0:00 2013  26.8M   147G
>>> ---
>>> As you can see, the snapshot rotating got stuck somewhere. What is
>>> displayed under .zfs/snapshot does not reflect what zfs is really seeing:
>>> daily.6 is inaccessible, and the rotation that happened so far is not
>>> reflected under .zfs/snapshot, either.
>>> cu
>>> Gerrit


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