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Re: how to check completeness? (was: Re: urgent: subversion)

From: Kenneth Porter <shiva_at_sewingwitch.com>
Date: 2004-08-07 01:44:41 CEST

--On Friday, August 06, 2004 7:05 PM -0400 Bryan Donlan <bdonlan@gmail.com>

> There's a special order in which the files must be copied, to prevent
> database corruption. svnadmin hotcopy implements this, whereas your
> backup system likely does not. If automatic logfile removal is
> enabled, hotcopy may fail in a race with a logfile deletion:
> http://subversion.tigris.org/issues/show_bug.cgi?id=1817
> Apart from that it should be safe (just make sure svnadmin hotcopy
> exits without error)

That makes sense.

My backup system is dump (http://dump.sf.net/), the same one used for as
long as I can remember on Unix systems, at least back to the late 80's. It
backs up a system by reading the raw disk structure and copying it to tape
in inode order. (I actually dump to a group of files on a Samba share.)

So any "safe" backup would need an initial step to take a snapshot of the
repository. Using a hot backup for this has the risk that someone might
look at the hot backup as the system dump happens, and merely looking at
the hot backup will modify it in a potentially unsafe way. That's not true
of the "svnadmin dump" backup, which is in a single immutable file.

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Received on Sat Aug 7 01:45:12 2004

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