| From: | Florian Weimer <fweimer(at)bfk(dot)de> |
|---|---|
| To: | Greg Smith <greg(at)2ndQuadrant(dot)com> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Fwd: Re: SSDD reliability |
| Date: | 2011-05-05 08:36:05 |
| Message-ID: | 82mxj1o87e.fsf@mid.bfk.de |
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| Lists: | pgsql-general |
* Greg Smith:
> Intel claims their Annual Failure Rate (AFR) on their SSDs in IT
> deployments (not OEM ones) is 0.6%. Typical measured AFR rates for
> mechanical drives is around 2% during their first year, spiking to 5%
> afterwards. I suspect that Intel's numbers are actually much better
> than the other manufacturers here, so a SSD from anyone else can
> easily be less reliable than a regular hard drive still.
I'm a bit concerned with usage-dependent failures. Presumably, two SDDs
in a RAID-1 configuration are weared down in the same way, and it would
be rather inconvenient if they failed at the same point. With hard
disks, this doesn't seem to happen; even bad batches fail pretty much
randomly.
--
Florian Weimer <fweimer(at)bfk(dot)de>
BFK edv-consulting GmbH http://www.bfk.de/
Kriegsstraße 100 tel: +49-721-96201-1
D-76133 Karlsruhe fax: +49-721-96201-99
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