Date: Fri, 01 Mar 2013 14:37:26 -0600 From: Karl Denninger <karl@denninger.net> To: freebsd-stable@freebsd.org Subject: Re: Musings on ZFS Backup strategies Message-ID: <51311186.1070607@denninger.net> In-Reply-To: <Pine.GSO.4.64.1303011521590.2804@sea.ntplx.net> References: <20130301165040.GA26251@anubis.morrow.me.uk> <20130301185912.GA27546@anubis.morrow.me.uk> <Pine.GSO.4.64.1303011521590.2804@sea.ntplx.net>
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On 3/1/2013 2:34 PM, Daniel Eischen wrote: > On Fri, 1 Mar 2013, Ben Morrow wrote: > >> Quoth Daniel Eischen <deischen@freebsd.org>: >>> >>> Yes, we still use a couple of DLT autoloaders and have nightly >>> incrementals and weekly fulls. This is the problem I have with >>> converting to ZFS. Our typical recovery is when a user says >>> they need a directory or set of files from a week or two ago. >>> Using dump from tape, I can easily extract *just* the necessary >>> files. I don't need a second system to restore to, so that >>> I can then extract the file. >> >> As Karl said originally, you can do that with snapshots without having >> to go to your backups at all. With the right arrangements (symlinks to >> the .zfs/snapshot/* directories, or just setting the snapdir property to >> 'visible') you can make it so users can do this sort of restore >> themselves without having to go through you. > > It wasn't clear that snapshots were traversable as a normal > directory structure. I was thinking it was just a blob > that you had to roll back to in order to get anything out > of it. > > Under our current scheme, we would remove snapshots > after the next (weekly) full zfs send (nee dump), so > it wouldn't help unless we kept snapshots around a > lot longer. > > Am I correct in assuming that one could: > > # zfs send -R snapshot | dd obs=10240 of=/dev/rst0 > > to archive it to tape instead of another [system:]drive? > Yes. -- -- Karl Denninger /The Market Ticker ®/ <http://market-ticker.org>; Cuda Systems LLC
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