On 2/16/10 12:32 PM, Lux, Jim (337C) wrote:
-----Original Message-----
From: beowulf-boun...@beowulf.org [mailto:beowulf-boun...@beowulf.org] On
Behalf Of Rahul Nabar
Sent: Tuesday, February 16, 2010 9:38 AM
To: land...@scalableinformatics.com
Cc: Mikhail Kuzminsky; beowulf@beowulf.org
Subject: Re: [Beowulf] Third-party drives not permitted on new Dell servers?
On Mon, Feb 15, 2010 at 7:41 PM, Joe Landman
<land...@scalableinformatics.com> wrote:
Please indulge my taking a contrarian view based upon the products we
sell/support/ship.
I can't and won't sanction their tone to you ... they should have explained
things correctly. Given that PERC are rebadged LSI, yeah, I know perfectly
well a whole mess of drives that *do not* work correctly with them.
So please don't take Dell to task for trying to help you avoid making what
they consider a bad decision on specific components. There could be a
marketing aspect to it, but support is a cost, and they want to minimize
costs. Look at failure rates, and toss the suppliers who have very high
ones.
Another worry is what happens in the long run if the vendor either
folds shop or stops selling and / or supporting that particular model
of drive. Frequently the lifecycle of these devices is longer than the
warranty. The inability to shop around for drives could be an issue.
Especially with this rigid approach of firmware rejecting a foreign
component and not just a warning.
"lifecycle" has a lot of meanings, and I think that's where the problems arise,
in some cases.
For the most part, PC hardware these days is designed based on a 3 year
replacement schedule, so a vendor will set up their warranty terms, model
introduction and retirement schedule based on that, regardless of whether the
actual life is much (sometimes much, much) longer (as all of us with old NT4.0
and DOS 3.x machines lurking in the lab know).
Unfortunately, the HPC (Beowulf) world is driven by the economics of the
ordinary consumer/office desktop computer. That's what lets you build a
teraflop machine without incurring the debt of a small country: you can
leverage the mass production for consumers which drives the prices down, but
also has very short product cycles.
The 3 year cycle is driven by in large part by IRS depreciation rules which call computer equipment
a "5-year" piece of gear, but MACRS means that by the end of year 3, you've already
depreciated over 70% of the purchase price. Considering that purchase price is about half the
"total cost of ownership" (at most), it makes sense to buy new gear that often (since the
help-desk, configuration management, networking, etc, support costs remain fixed per month). The
hardware cost is often a small fraction of the overall cost to put a computer on someone's desk. If
you look at a typical desktop PC scenario, you might have a $2500 computer, where the first year
depreciation is $42/mo, the second year is $67/mo, and the third year is $40/mo. On top of that,
support costs might be $100-200/mo. In the fourth year, under MACRS, the depreciation is $24/mo.
So you could get a brand new computer (which will be easier to support, is faster, etc.) for a big
$22/month hit on your budget
(!
which is<10% of the total monthly tab, counting the support costs). It's a
no brainer to turn over the computers that fast, especially if you are trying to
save on support costs by having a limited number of different models in the
installed base at any given time (which is what large companies do).
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OK, my brain hurts, now. You've been in Management too long, Jim!
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