From: | David Bear <David(dot)Bear(at)asu(dot)edu> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | pgsql-admin(at)postgresql(dot)org |
Subject: | Re: PITR with rsync |
Date: | 2007-08-07 00:46:08 |
Message-ID: | 20070807004608.GE19294@asu.edu |
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Thread: | |
Lists: | pgsql-admin |
On Mon, Aug 06, 2007 at 08:27:13PM -0400, Tom Lane wrote:
> David Bear <David(dot)Bear(at)asu(dot)edu> writes:
> > I'm still uncomfortable with using the file system style backup method
> > in PITR and am very interested in ' more information ' on how others
> > may be doing backups. Specifically, I assume that PITR methods would
> > also be accompanied with some combination of pg-dump.
>
> You assume wrong. Replaying WAL demands starting from a physical not
> logical dump, because page and tuple numbers and so forth have to be the
> same as in the master. A pg_dump backup will simply not work.
>
> > I am curious
> > about how frequently a pg-dump would be done if a PITR method was also
> > used (every 24 hours, every 7 days, not at all ) ??
>
> I'd personally be inclined to take a pg_dump every now and then just to
> have an independent backup method. Especially if I wasn't comfortable
> with PITR ;-). How often depends on how much bandwidth you can spare
> for backup purposes.
okay, thanks. the pg-dump is not an augementation, but a completely
separate backup method.
>
> > Also, looking at the archive_command argument in postgresql.conf. Has
> > anyone use rsync there?
>
> I suppose you could, but what's the point? Copying a single file that
> doesn't currently exist on the destination plays to none of rsync's
> strengths.
well, I was using rysnc so I could copy to a different computer over
ssh, not using the rsync protocol to catch diffs. I don't have a
remote file system mounted so I can do just a cp. Am I still thinking
wrong here?
>
> regards, tom lane
--
David Bear
phone: 602-496-0424
fax: 602-496-0955
College of Public Programs/ASU
University Center Rm 622
411 N Central
Phoenix, AZ 85007-0685
"Beware the IP portfolio, everyone will be suspect of trespassing"
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