Date: Fri, 20 Dec 2013 17:18:18 +0100 (CET) From: krichy@tvnetwork.hu To: =?ISO-8859-15?Q?Gerrit_K=FChn?= <gerrit.kuehn@aei.mpg.de> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS snapshot renames failing after upgrade to 9.2 Message-ID: <alpine.DEB.2.10.1312201716570.22349@krichy.tvnetwork.hu> In-Reply-To: <alpine.DEB.2.10.1312201010350.12244@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>
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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. On Fri, 20 Dec 2013, krichy@tvnetwork.hu wrote: > Date: Fri, 20 Dec 2013 10:19:15 +0100 (CET) > From: krichy@tvnetwork.hu > To: Gerrit Kühn <gerrit.kuehn@aei.mpg.de> > Cc: freebsd-fs@freebsd.org > Subject: Re: ZFS snapshot renames failing after upgrade to 9.2 > > Dear Gerrit, > > It is not a solution, but I use different snapshot handling mechanisms. I > wrote a simple script which handles that, and the snapshots are named by its > creation timestamp. I think it is more usable to see that when that snapshot > was exactly taken, and the script thus only does snapshot creation, and > deletion, no renames. > > That scripts only limitation is that it is planned to run hourly, creating > hourly snapshots, and when run again, it queries the existing one's list, and > decides which to keep or remove. Thus you have to run it hourly in cron like: > # crontab -l > 0 * * * * /usr/local/sbin/zfs-snapshot > > Regards, > > > Kojedzinszky Richard > Euronet Magyarorszag Informatikai Zrt. > > On Fri, 20 Dec 2013, Gerrit Kühn wrote: > >> Date: Fri, 20 Dec 2013 10:05:22 +0100 >> From: Gerrit Kühn <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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