From: Greg Stark <gsstark@mit.edu>
To: Michael Stone <mstone+postgres@mathom.us>
Cc: pgsql-performance@postgresql.org
Subject: Re: Fwd: Multiple disks: RAID 5 or PG Cluster
Date: 19 Jun 2005 01:53:50 -0400
Message-ID: <8764wa3n9t.fsf@stark.xeocode.com> (raw)
In-Reply-To: <20050618225748.GI25854@mathom.us>
References: <b47a630c09af1837a54c23c8b1c3c01f@implements.be>
<20050618225748.GI25854@mathom.us>
Michael Stone <mstone+postgres@mathom.us> writes:
> it is possible to have a mirror of more than two disks (which would have the
> same read advantage as the striped configuration with the same number of
> disks) but this is rarely seen because it is expensive.
Actually three-way mirrors are quite common for backup purposes. To take a
backup you break the mirror by taking one of the three copies out. Back it up
at your leisure, then just resync it in time for the next backup.
--
greg
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To: pgsql-performance@postgresql.org
Cc: gsstark@mit.edu, mstone+postgres@mathom.us
Subject: Re: Fwd: Multiple disks: RAID 5 or PG Cluster
In-Reply-To: <8764wa3n9t.fsf@stark.xeocode.com>
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