Date: Wed, 1 Apr 2009 13:49:46 -0400 (EDT)
From: Greg Smith <gsmith@gregsmith.com>
To: Scott Marlowe <scott.marlowe@gmail.com>
cc: Stef Telford <stef@ummon.com>, Mark Kirkwood <markir@paradise.net.nz>,
	Scott Carey <scott@richrelevance.com>,
	"pgsql-performance@postgresql.org" <pgsql-performance@postgresql.org>
Subject: Re: Raid 10 chunksize
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On Wed, 1 Apr 2009, Scott Marlowe wrote:

> Meteor strike is far less likely than a power surge taking out a UPS.

I average having a system go down during a power outage because the UPS it 
was attached to wasn't working right anymore about once every five years. 
And I don't usually manage that many systems.

The only real way to know if a UPS is working right is to actually detach 
power and confirm the battery still works, which is downtime nobody ever 
feels is warranted for a production system.  Then, one day the power dies, 
the UPS battery doesn't work to spec anymore, and you're done.

Of course, I have a BBC controller in my home desktop, so that gives you 
an idea where I'm at as far as paranoia here goes.

--
* Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD