From: Karl Denninger <karl@denninger.net>
To: pgsql-performance@postgresql.org
Subject: Re: Capacitors, etc., in hard drives and SSD for DBMS machines...
Date: Fri, 8 Jul 2016 08:27:37 -0500
Message-ID: <31c32f1d-2c36-a8da-1653-43273fd86d65@denninger.net> (raw)
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On 7/8/2016 05:23, Jean-David Beyer wrote:
> Why all this concern about how long a disk (or SSD) drive can stay up
> after a power failure?
Never had a power supply fail, have you? Or (accidentally) pull the
wrong cord? :)
> It seems to me that anyone interested in maintaining an important
> database would have suitable backup power on their entire systems,
> including the disk drives, so they could coast over any power loss.
>
> I do not have any database that important, but my machine has an APC
> Smart-UPS that has 2 1/2 hours of backup time with relatively new
> batteries in it. It is so oversize because my previous computer used
> much more power than this one does. And if my power company has a brown
> out or black out of over 7 seconds, my natural gas fueled backup
> generator picks up the load very quickly.
>
> Am I overlooking something?
Yep -- Murphy. And he's a bastard.
--
Karl Denninger
karl@denninger.net <mailto:karl@denninger.net>
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To: pgsql-performance@postgresql.org
Cc: karl@denninger.net
Subject: Re: Capacitors, etc., in hard drives and SSD for DBMS machines...
In-Reply-To: <31c32f1d-2c36-a8da-1653-43273fd86d65@denninger.net>
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