Date: Wed, 01 Jun 2011 10:02:58 +0200 From: Alexander Leidinger <Alexander@Leidinger.net> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-fs@freebsd.org Subject: Re: Storing revisions of large files using ZFS snapshots Message-ID: <20110601100258.13973yayckqlukvm@webmail.leidinger.net> In-Reply-To: <20110601005219.GA11776@icarus.home.lan> References: <FFD730CF-2454-4A07-BA26-0C3B7257780E@itassistans.se> <20110601005219.GA11776@icarus.home.lan>
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Quoting Jeremy Chadwick <freebsd@jdc.parodius.com> (from Tue, 31 May
2011 17:52:19 -0700):
> Speaking strictly about ZFS snapshots:
>
> The mentality of ZFS snapshots seems very similar to that of UFS
> snapshots, in the sense that the design/model seems to be oriented
> towards "bare-metal" restoration.
>
> That works generally okay (depends on your view) for administrators,
> but depending on your demographic, it almost certainly won't work for
> users.
>
> We've found that in most cases, a user will overwrite or rm a file which
> they didn't mean to and wish to restore just that file. They need to do
> so quickly and easily. ZFS and UFS snapshots don't make this easy for
> them to accomplish (ZFS is easier than UFS in this regard, absolutely).
What's hard about doing a
cp /path/to/fs/.zfs/snapshot/snap_name/subdir/file /path/to/fs/subdir/
?
If it is hard for the user to determine what is the base dataset for
his current place, you could provide a zfs restore script (requirement
of the following, feel free to adapt: user is in the dir where he
wants to restore, commands not really tested, errors not handled):
- zfsrestore list
-> base=$(df . | awk '/Mounted on/ {next} {print $6}')
-> echo Available snapshots
-> ls -1 ${base}/.zfs/snapshot
- zfs restore <snapshot> <file>
-> base=$(df . | awk '/Mounted on/ {next} {print $6}')
-> reminder=$(echo $PWD | sed -e "s:${base}/::g")
-> cp -v ${base}/.zfs/snapshot/$arg1/${reminder}/$arg2 .
Bye,
Alexander.
--
http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7
http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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