Re: Dump and Restore Utility
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Martin McCormick wrote:
> Nicolas KOWALSKI writes:
>> Yes, dump is working well with ext3 filesystems, as long as they
>> are not actively modified. LVM may come to help here.
>
> Many thanks. That is a problem more or less with any backup method
> that doesn't unmount and convert to read-only a given file system.
I use rsync. It's fairly consistent, even if the file system is in use.
Your situation will be worse, however, if, say a data base application
writes a lot to many different files at different times and the
combination of different files might turn out inconsistent.
- From [1]
> Q: What happens if a file is modified while the backup is taking
> place?
>
> A: In rsync, transfers are done to a temporary file, which
> is cut over atomically, so the transfer either happens in its
> entirety or not at all. Basically, rsync does "the right thing," so
> you won't end up with partially-backed-up files. Thanks to Filippo
> Carletti for pointing this out. If you absolutely need a snapshot
> from a single instant in time, consider using Sistina's LVM (see
> reference above).
YMMV.
Johannes
[1] http://www.mikerubel.org/computers/rsync_snapshots/
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