| From: | Florian Weimer <fweimer(at)bfk(dot)de> |
|---|---|
| To: | Yeb Havinga <yebhavinga(at)gmail(dot)com> |
| Cc: | Andy <angelflow(at)yahoo(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: BBU still needed with SSD? |
| Date: | 2011-07-19 07:56:54 |
| Message-ID: | 82vcuyd7p5.fsf@mid.bfk.de |
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| Lists: | pgsql-performance |
* Yeb Havinga:
> The biggest drawback of 2 SSD's with supercap in hardware raid 1, is
> that if they are both new and of the same model/firmware, they'd
> probably reach the end of their write cycles at the same time, thereby
> failing simultaneously.
I thought so too, but I've got two Intel 320s (I suppose, the report
device model is "SSDSA2CT040G3") in a RAID 1 configuration, and after
about a month of testing, one is down to 89 on the media wearout
indicator, and the other is still at 96. Both devices are
deteriorating, but one at a significantly faster rate.
--
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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