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Overlapping backups: should I expect problems?
2008-09-16 00:13:18
Hi,
We're doing our on-site backups using virtual tapes. Two hard drives
are dedicated to this. In an attempt to be clever, I set up two
configurations, DS2 and DS3, that back up the same filesystems, but
whose virtual tapes are on separate disks. The idea is that if we need
to restore, and one of the disks turns out to have a problem, that we'll
still have the other disk with a complete level 0 and incrementals. The
configurations run on alternating days. Does this make sense?
My question is, is this actually a good idea? Will there be any
problems I haven't anticipated, such as the two configs conflicting?
For example, I notice that there is only one /etc/amandates file that is
presumably shared by both configurations. I don't know whether the date
to begin incrementals from is from this file or from
/var/lib/amanda/gnutar-lists.
Thanks for any hints! This configuration has been running for a few
weeks without any evident problems so far, except for one DLE whose
incrementals are always the same size as the level 0s, despite that
there are very few changes to the filesystem; I'm still working that one
out.
John
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