| From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: pg_start_backup and pg_stop_backup Re: Re: [COMMITTERS] pgsql: Make CheckRequiredParameterValues() depend upon correct |
| Date: | 2010-04-28 17:22:46 |
| Message-ID: | 1272475366.24286.34.camel@jd-desktop.unknown.charter.com |
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| Thread: | |
| Lists: | pgsql-hackers |
On Wed, 2010-04-28 at 12:44 -0400, Robert Haas wrote:
> On Wed, Apr 28, 2010 at 11:25 AM, Heikki Linnakangas
> <heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
> > Robert Haas wrote:
> >> At least as I understand it, even when not using
> >> archive_mode, streaming replication, or hot standby, it's still
> >> perfectly legal to use pg_start_backup() to take a hot backup.
> >
> > Nope. The correct procedure to take a hot backup is described in
> > http://www.postgresql.org/docs/8.4/interactive/continuous-archiving.html#BACKUP-TIPS.
> > It involves setting archive_mode=on, and archive_command to a shell
> > command that normally just returns true, except when backup is in
> > progress. You can't take a hot backup without archiving (or streaming)
> > at least temporarily. (except with filesystem-level snapshot capabilities).
>
> Oh. Well, in that case the proposed change seems reasonable... but
> what do you mean by "except with filesystem-level snapshot
> capabilities"?
Like LVM, SANS or ZFS.
Joshua D. Drake
>
> ...Robert
>
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