Calculating the availability and economic trade-offs of configurations
is hard. Rule of thumb seems to rule.
I recently profiled an availability/reliability tool on
StorageMojo.com that uses Bayesian analysis to estimate datacenter
availability. You can quickly (minutes, not days) model systems and
compare availability and recovery times as well as OpEx and CapEx
implications.
One hole: AFAIK, ZFS isn't in their product catalog. There's a free
version of the tool at http://www.twinstrata.com/
Feedback on the tool from this group is invited.
Robin
StorageMojo.com
Date: Tue, 17 Feb 2009 21:36:38 -0800
From: Richard Elling <richard.ell...@gmail.com>
To: Toby Thain <t...@telegraphics.com.au>
Cc: zfs-discuss@opensolaris.org
Subject: Re: [zfs-discuss] ZFS on SAN?
Message-ID: <499b9e66.2010...@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Toby Thain wrote:
Not at all. You've convinced me. Your servers will never, ever lose
power unexpectedly.
Methinks living in Auckland has something to do with that :-)
http://en.wikipedia.org/wiki/1998_Auckland_power_crisis
When services are reliable, then complacency brings risk.
My favorite example recently is the levees in New Orleans.
Katrina didn't top the levees, they were undermined.
-- richard
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