Date: Sat, 26 Nov 2005 07:01:43 -0600 From: Eric Anderson <anderson@centtech.com> To: Robert Watson <rwatson@FreeBSD.org> Cc: freebsd-isp@FreeBSD.org Subject: Re: Backup solutions Message-ID: <43885CB7.1070700@centtech.com> In-Reply-To: <20051126123044.B81764@fledge.watson.org> References: <Pine.BSI.4.05L.10511161819420.440-100000@mail.lanline.com> <57416b300511162006m4cfe53f8n6dc2bccb877a5567@mail.gmail.com> <437C776B.6000705@centtech.com> <20051126123044.B81764@fledge.watson.org>
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Robert Watson wrote: > On Thu, 17 Nov 2005, Eric Anderson wrote: > >>> FWIW, i have read that by far the best is dump, because of the way it >>> deals with the raw data. No need to worry bout files with holes in >>> them (with other backup tools, this could mean you may not be able to >>> fit the file system back on after backup, if there are core files >>> etc) I believe i read this in the O'Rielly text Unix Power Tools, but >>> could be wrong. They also referenced an extensive test that was done >>> by someone, and gave the link. I will post it if i find it. >> >> >> rsync handles sparse files just fine. > > > The problem I've had with rsync is that it wants to build a list of all > files to be backed up. On my cyrus server, I have file systems with >6m > files. This causes rsync to core dump when it discovers it can't > allocate memory to hold the entire list at once. > > Recently I've taken to backing up with dump -L, as the snapshot facility > means recovery after a failure is a lot easier -- you no longer have to > worry about the fact that the first file in a directory might be backed > up at 10:00am, and the second at 2:00pm, causing applications to get > very upset. Unfortunately, I don't have that option, since the servers I am backing up are linux machines with a custom filesystem that does not support snapshots. rsync is easy on the network, but hard on the disks. Eric -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology Anything that works is better than anything that doesn't. ------------------------------------------------------------------------
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