<div dir="ltr">JPK III makes some good points, esp. regarding enterprise vs desk top class drives. However, while SAS controllers handle SATA drives just fine, SATA controllers can't handle SAS drives, so besides the fact that SAS drives cost a bunch more than SATA drives of equivalent capacities, unless you have a true server motherboard, you most likely don't have an embedded SAS controller and an addin SAS controller will set you back several hundred $. So like he said, it boils down to a question of how much $ you have to spend.<div>
<br></div><div style>I haven't researched the issue, but since modern drives all use perpendicular encoding (how else could they cram 1TB on a single platter?) it would make some sense that thermal expansion could be more of a problem. I would assume the problem would mostly relate to the warm up phase, so that if the drive can "find itself" at boot, maybe it might have some trouble keeping track of tracks while the platters come up to full operating temps, but once stabilized I would think that all would be good again. Just a somewhat educated guess, no empirical data to back it up.</div>
<div style>GC</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Jan 8, 2013 at 1:50 PM, Jim Kinney <span dir="ltr"><<a href="mailto:jim.kinney@gmail.com" target="_blank">jim.kinney@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">best is whatever you DON'T have unless someone else paid for what you DO have. :-)<br><br>Seriously, enterprise drives are better than home use drives. Within each classification, the differences between drives are negligible over their lifespan. warranties are a good indicator of how well a drive tested out at the manufacturers facility but not a good indicator of how it will work in your gear with your loading, cooling, vibrations and power.<br>
<br>Newer drives (i.e. higher capacity) seem to be more sensitive to temperature than drives from 5 years ago. SAS drives seems to be able to take temps than would melt most cheeses. <br><br>In short: how much money do you have? It's often easier to build a RAID10 and have a spare pair for cheaper than buying a pile of expensive drives with longer warranty. Many people have drives that are 10 years old and doing fine. <br>
<br><div class="gmail_quote"><div class="im">On Tue, Jan 8, 2013 at 11:20 AM, Derek Atkins <span dir="ltr"><<a href="mailto:warlord@mit.edu" target="_blank">warlord@mit.edu</a>></span> wrote:<br></div><div><div class="h5">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hey all,<br>
<br>
I'm looking to replace some 1TB HDDs in a s/w RAID-10 array with some<br>
2TB models. The existing drives have been running flawlessly for a few<br>
years, so they are due to get swapped out anyways. I did have one disk<br>
fail a year or so ago so it was swapped out, and I bought a cold spare<br>
at the same time so I have one more spare (of the same type/model as the<br>
replacement drive). So I'm looking for another pair of drives that I<br>
can use as the mirrors (so each mirror has one of type/batch-A and one<br>
of the yet-to-be-bought set of drives).<br>
<br>
Of course, when I bought the drives warranties were 3 or 5 years, not<br>
the '1 or 2' years they are now. So I'm looking for the "best value"<br>
2TB drives available today -- lowest price for highest quality + good<br>
warranty. It looks like I can pretty much only choose between WD and<br>
Seagate nowadays -- I guess lots of consolidation in the market? (My<br>
existing drives were Hitachi, which in my experience were always great<br>
drives).<br>
<br>
What's the current going theories and best practices? Any concrete<br>
suggestions (links to NewEgg or some other vendor would be appreciated).<br>
<br>
:)<br>
<br>
Thanks,<br>
<br>
-derek<br>
<span><font color="#888888"><br>
--<br>
Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory<br>
Member, MIT Student Information Processing Board (SIPB)<br>
URL: <a href="http://web.mit.edu/warlord/" target="_blank">http://web.mit.edu/warlord/</a> PP-ASEL-IA N1NWH<br>
<a href="mailto:warlord@MIT.EDU" target="_blank">warlord@MIT.EDU</a> PGP key available<br>
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</font></span></blockquote></div></div></div><span class="HOEnZb"><font color="#888888"><br><br clear="all"><br>-- <br>-- <br>James P. Kinney III<br><i><i><i><i><br></i></i></i></i>Every time you stop a school, you will have to build a jail. What you
gain at one end you lose at the other. It's like feeding a dog on his
own tail. It won't fatten the dog.<br>
- Speech 11/23/1900 Mark Twain<br><i><i><i><i><br><a href="http://electjimkinney.org" target="_blank">http://electjimkinney.org</a><br><a href="http://heretothereideas.blogspot.com/" target="_blank">http://heretothereideas.blogspot.com/</a><br>
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