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Re: Battery Backed Cache for RAID

From: "Merlin Moncure" <merlin(dot)moncure(at)rcsonline(dot)com>
To: "Alvaro Herrera" <alvherre(at)alvh(dot)no-ip(dot)org>
Cc: "Pgsql-Performance" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Battery Backed Cache for RAID
Date: 2005-09-14 20:17:06
Message-ID: 6EE64EF3AB31D5448D0007DD34EEB3417DD346@Herge.rcsinc.local (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
> On Wed, Sep 14, 2005 at 11:28:43AM -0700, Jeffrey W. Baker wrote:
> > On Wed, 2005-09-14 at 11:25 -0700, Peter Darley wrote:
> > > 	I'm getting a new server for our database, and I have a quick
> question
> > > about RAID controllers with a battery backed cache.  I understand
> the
> > > cache will allow the cache to be written out if the power fails to
> box,
> > > which allows it to report a write as committed safely when it's
> actually
> > > committed.
> >
> > Actually the cache will just hold its contents while the power is
> > When the power is restored, the RAID controller will complete the
> > to disk.  If the battery does not last through the outage, the data
> > lost.
> Just curious: how long are the batteries supposed to last?
For the length of time it will take for you to get fired for not getting
the server running plus one hour :).


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Subject: Re: Battery Backed Cache for RAID
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