openstack team mailing list archive

[Kuo Hugo <tonytkdk@xxxxxxxxx>]

There's a most important point.

A better monitor/notification method of disks .




2013/1/30 Jan Drake <jan_drake@xxxxxxxxxxx>

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