Re: A few questions to real pgsql gurus

From: Bradley McLean <brad(at)bradm(dot)net>
To: Larry Rosenman <ler(at)lerctr(dot)org>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, gearond(at)cvc(dot)net, Dmitry Tkach <dmitry(at)openratings(dot)com>, mike McGire <mmcgire(at)hotmail(dot)com>, pgsql-general(at)postgresql(dot)org
Subject: Re: A few questions to real pgsql gurus
Date: 2003-02-24 19:58:16
Message-ID: 20030224195816.GA7551@nia.bradm.net
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* Larry Rosenman (ler(at)lerctr(dot)org) [030224 13:48]:
>
> --On Monday, February 24, 2003 12:28:03 -0500 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
> wrote:
>
> >If he's got an accurate snapshot of the WAL files, everything the
> >database has claimed to be committed will be committed. It's the same
> >scenario as a crash.
>
> the netapp facility is called SnapShot.
>
> What happens is that the original blocks of the file are write protected,
> and any changes are put elsewhere. (I don't recall whether it's the new or
> the old blocks that get saved, but it doesn't matter, the effect is the
> same).
>
> The snapshot stuff in Veritas' VxFS is very similar.
>
> It makes a consistent view of the filesystem available for backup.

And just for completeness, this is also available in Linux via LVM
see http://tldp.org/HOWTO/LVM-HOWTO/index.html - it works great out of
the box on RH8 - we have a 2TB NFS/SMB server built on it.

-Brad

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