<div dir="ltr">There's a most important point. <div><br></div><div style>A better monitor/notification method of disks .</div><div style><br></div><div style><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">
2013/1/30 Jan Drake <span dir="ltr"><<a href="mailto:jan_drake@hotmail.com" target="_blank">jan_drake@hotmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
A presentation at the first openstack design summit was given in which a<br>
vendor did a couple of petabyte swift implementations. In that<br>
presentation, they explained that in one implementation they used<br>
enterprise drives and another desktop drives.<br>
<br>
Enterprise drive failures were higher due to lack of burn-in and cost was<br>
higher.<br>
Desktop drive failures were close to zero as they found a vendor to burn<br>
them in upon purchase.<br>
<br>
The net net here is this:<br>
<br>
- Use commodity hardware<br>
- Plan for failures<br>
- Use chassis that make it quick/easy to replace drives<br>
<br>
Intel is working on a 12 drive array (inexpensive by their terms) that is<br>
meant to be throw-awayŠ sealed chassisŠ automatically fails drives over<br>
and links to other drive arrays.<br>
<br>
Cheapest is best for file/object storage. Block storage may be a<br>
different matter depending on your requirements.<br>
<span class="HOEnZb"><font color="#888888"><br>
<br>
Jan<br>
</font></span><div class="HOEnZb"><div class="h5"><br>
On 1/29/13 8:42 AM, "Chuck Thier" <<a href="mailto:cthier@gmail.com">cthier@gmail.com</a>> wrote:<br>
<br>
>Hi John,<br>
><br>
>It would be difficult to recommend a specific drive, because things<br>
>change so often. New drives are being introduced all the time.<br>
>Manufacturers buy their competition and cancel their awesome products.<br>
> So the short answer is that you really need to test the drives out in<br>
>your environment and in your use case. I can pass on some wisdom from<br>
>our experience.<br>
><br>
>1. "Enterprise" drives are not worth it. We have not seen a<br>
>significant difference between the failure rate of enterprise class<br>
>drives and commodity drives. I have heard this as well from other<br>
>large swift deployers, as well as other large storage providers. Even<br>
>if enterprise drives had a significantly less failure rate, the added<br>
>cost would not be worth it.<br>
><br>
>2. Be wary of "Green" drives. The green features on these drives can<br>
>work against you in a swift cluster (like auto parking heads and<br>
>spinning down). If you are going with a green drive, make sure they<br>
>are well tested, and/or at least have the capability to turn these<br>
>features off.<br>
><br>
>3. Go big. If you can, use 3T or larger drives. You get a more even<br>
>distribution and better overall utilization with larger drives.<br>
><br>
>4. Don't believe everything you read on the internet (including me<br>
>:)) Test! Test! Test!<br>
><br>
>--<br>
>Chuck<br>
><br>
>On Mon, Jan 28, 2013 at 7:11 PM, John van Ommen <<a href="mailto:john.vanommen@gmail.com">john.vanommen@gmail.com</a>><br>
>wrote:<br>
>> Does anyone on the list have a disk they'd recommend for OpenStack<br>
>>swift?<br>
>><br>
>> I am looking at hardware from Dell and HP, and I've found that the<br>
>> disks they offer are very expensive. For instance, HP's 2TB disk has<br>
>> a MSRP of over $500, while you can get a Western Digital 2TB 'Red'<br>
>> disk for $127.<br>
>><br>
>> Is there any reason to opt for the drives offered by Dell or HP? (I<br>
>> assume they're re-branded disks from Seagate and WD anyways.)<br>
>><br>
>> Are there any disk SKUs that you'd recommend?<br>
>><br>
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<br>
<br>
<br>
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</div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div>+Hugo Kuo+</div><div><a href="mailto:tonytkdk@gmail.com" target="_blank">tonytkdk@gmail.com<br></a></div><div><a href="mailto:tonytkdk@gmail.com" target="_blank">+</a>886 935004793</div>
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