Date: Mon, 22 Nov 2010 17:20:41 -0500 From: Jonathan <jonathan@kc8onw.net> To: Andrew Reilly <areilly@bigpond.net.au> Cc: stable@freebsd.org Subject: Re: ZFS backups: retrieving a few files? Message-ID: <4CEAECB9.2080400@kc8onw.net> In-Reply-To: <20101122221350.GA81098@johnny.reilly.home> References: <20101122113541.GA74719@johnny.reilly.home> <4CEA8BA6.7080009@kc8onw.net> <20101122221350.GA81098@johnny.reilly.home>
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On 11/22/2010 5:13 PM, Andrew Reilly wrote: > On Mon, Nov 22, 2010 at 10:26:30AM -0500, Jonathan Stewart wrote: >> On 11/22/2010 6:35 AM, Andrew Reilly wrote: >>> Dump/restore doesn't work for ZFS. I *think* that I'm running >>> backups in the appropriate equivalent fashion: I take file >>> system snapshots (both absolute == level 0) and relative >>> (incremental), and zfs send those to files on the backup disk. >> >> This is actively discouraged, there is no recovery ability when >> receiving zfs streams so 1 bad bit would invalidate your entire backup. > > Hmm. Isn't that a problem that also affects the "sending > snapshots" scheme that you describe, below? When sending the snapshots to a new file system you know right away whether they are bad or not. Otherwise you find out when you are trying to restore and your backups are bad... A send could fail but you can always retry that, you can't retry anything when your trying to restore. Jonathan
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