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List:       gentoo-user
Subject:    Re: [gentoo-user] hp H222 SAS controller
From:       "Stefan G. Weichinger" <lists () xunil ! at>
Date:       2013-07-10 17:12:41
Message-ID: 51DD9609.9040402 () xunil ! at
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Am 08.07.2013 23:42, schrieb Alan McKinnon:

> If it makes you feel better, then by all means go through the motions
> .
> 
> For my money, I reckon that's exactly what it is - motions and ritual. I
> havew any anecdotal evidence to back it up, but it's fairly strong
> anecdotal evidence:
> 
> Over the last 5 years, the team I'm in, the teams we work closely with
> and the Storage guys have commissioned >1000 pieces of hardware and
> probably more than 4000 drives, the vast majority from Dell. I have no
> idea what burn-in Dell applies, if any. We've had our fair share of
> infant mortality failures, prob ably less than 20 in 5 years. And here's
> the kicker - every single one failed in production.
> 
> Most of that hardware, and ALL of the SANs, went through heavy
> pre-deployment testing. Usually, this means cloning the -dev system onto
> it and running the crap out of it for a decent length of time. Once the
> techies were happy, install the production version and switch it on.
> 
> I conclude that the likely reason we only found failure in prod is that
> only prod gives a decent viable test that approximates real life and dev
> is always a mere simulation. It's not usage that kills a few drives
> early, it's the almost random pattern of disk access that you get in
> real life. That tends to shake out the weak links better than any test.
> 
> However, this is all anecdotal so use or discard as you see fit :-). I
> no longer worry about data loss as we have 4 hour warranty turnaround
> SLAs in place and company policy is to only deploy storage that is
> guaranteed to survive loss of any one drive in an array.

Thanks for that, good point :-)

Stefan


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