Date: Sat, 21 Nov 2009 01:52:51 -0800 From: George Davidovich <freebsd@optimis.net> To: freebsd-questions@freebsd.org Subject: Re: Dump Message-ID: <20091121095251.GA63630@marvin.optimis.net> In-Reply-To: <4B075AAA.80205@bah.homeip.net> References: <4B0562A4.5050405@bah.homeip.net> <4B056636.6050309@infracaninophile.co.uk> <4B075AAA.80205@bah.homeip.net>
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On Sat, Nov 21, 2009 at 04:12:42AM +0100, Bernt Hansson wrote: > Matthew Seaman skrev: > > Bernt Hansson wrote: > > > > > > I've been testing backups with dump, works well BUT > > > -L does not work. For example > > > > > > dump -0 -a -u -L -f /mnt/dump.home.full /dev/ad0s2d > > > > I believe that you need to tell dump the mount point of the file > > system in order for it to create a snapshot, rather than the device > > file for the partition. (ie. snapshotting only makes sense on a > > mounted read-write filesystem). Actually, the above isn't correct. A device special is fine. From the dump(8) manpage: The file system to be dumped is specified by the argument filesystem as either its device-special file or its mount point (if that is in a standard entry in /etc/fstab). The criteria unique to live dumps is that /dev/ad0s2d must be already mounted, and there must be a .snap directory in its root. You've since changed your command, so I won't address what the problem might have been. > > Also, if you're dumping a snapshotted FS to a local file, then bump > > up the cachesize to improve performance a lot. Add '-C 32' to your > > command-line. > > Ok. I've tested this > dump -1 -a -u -L -C 64 -h 0 -f /usr/home/bernt/disk2/dump.backup.home.2 /usr/home Was the change from 'dump -0' to 'dump -1' intentional? Dump levels are rarely chosen to be sequential, but a level of 1 or greater is generally performed after a level 0 dump. > The error is mksnap_ffs: Cannot create /usr/home/.snap/dump_snapshot: > Invalid argument dump: Cannot create /usr/home/.snap/dump_snapshot: No > such file or directory You've now specified what's likely a directory (/usr/home), not a device-special or mount point. Your choices of valid filesystems can be determined by running df(1) and examining the first and last columns. On a typical install those two columns might be: Filesystem Mounted on /dev/ad0s1a / devfs /dev # ignore this line /dev/ad0s1e /tmp /dev/ad0s1f /usr /dev/ad0s1d /var Pick one. I prefer device names. FWIW, if you're going to be using dump regularly (i.e. multiple dump levels and/or multiple hosts) and dumping to files, I'd suggest a naming convention of hostname-20090405-usr-0 to save you the grief of date fragility, and give you a meaningful display in 'ls -l' when restoring. So, for a level 0 dump on your system, your commands might be: dumpdir=/home/bernt/disk2 dump -0auL -C 64 -f $dumpdir/hostname-20091121-root-0 -h 0 / dump -0auL -C 64 -f $dumpdir/hostname-20091121-usr-0 -h 0 /usr dump -0auL -C 64 -f $dumpdir/hostname-20091121-var-0 -h 0 /var -- George
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