Date: Mon, 04 Mar 2013 18:07:30 +0200 From: Volodymyr Kostyrko <c.kworr@gmail.com> To: David Magda <dmagda@ee.ryerson.ca> Cc: freebsd-stable@freebsd.org Subject: Re: Musings on ZFS Backup strategies Message-ID: <5134C6C2.9020009@gmail.com> In-Reply-To: <2B318078-F863-4415-8DAE-94EE4431BF4C@ee.ryerson.ca> References: <5130BA35.5060809@denninger.net> <5130EB8A.7060706@gmail.com> <2B318078-F863-4415-8DAE-94EE4431BF4C@ee.ryerson.ca>
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02.03.2013 03:12, David Magda: > > On Mar 1, 2013, at 12:55, Volodymyr Kostyrko wrote: > >> Yes, I'm working with backups the same way, I wrote a simple script that synchronizes two filesystems between distant servers. I also use the same script to synchronize bushy filesystems (with hundred thousands of files) where rsync produces a too big load for synchronizing. >> >> https://github.com/kworr/zfSnap/commit/08d8b499dbc2527a652cddbc601c7ee8c0c23301 > > There are quite a few scripts out there: > > http://www.freshports.org/search.php?query=zfs A lot of them require python or ruby, and none of them manages synchronizing snapshots over network. > For file level copying, where you don't want to walk the entire tree, here is the "zfs diff" command: > >> zfs diff [-FHt] snapshot [snapshot|filesystem] >> >> Describes differences between a snapshot and a successor dataset. The >> successor dataset can be a later snapshot or the current filesystem. >> >> The changed files are displayed including the change type. The change >> type is displayed useing a single character. If a file or directory >> was renamed, the old and the new names are displayed. > > http://www.freebsd.org/cgi/man.cgi?query=zfs > > This allows one to get a quick list of files and directories, then use tar/rsync/cp/etc. to do the actual copy (where the destination does not have to be ZFS: e.g., NFS, ext4, Lustre, HDFS, etc.). I know that but I see no reason in reverting to file-based synch if I can do block-based. -- Sphinx of black quartz, judge my vow.
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