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Re: Contemplating SSD Hardware RAID

From: Merlin Moncure <mmoncure(at)gmail(dot)com>
To: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
Cc: Yeb Havinga <yebhavinga(at)gmail(dot)com>, Greg Smith <greg(at)2ndquadrant(dot)com>, Florian Weimer <fweimer(at)bfk(dot)de>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Contemplating SSD Hardware RAID
Date: 2011-06-21 21:35:33
Message-ID: BANLkTimoJGY6smRZmizkz_w6CxFH8Y0XaQ@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Tue, Jun 21, 2011 at 3:32 PM, Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com> wrote:
> On Tue, Jun 21, 2011 at 2:25 PM, Yeb Havinga <yebhavinga(at)gmail(dot)com> wrote:
>
>> strange values mean. It's too bad however that OCZ doesn't let the user
>> choose which firmware to run (the tool always picks the newest), so after
>> every upgrade it'll be a surprise what values are supported or if any of the
>
> That right there pretty much eliminates them from consideration for
> enterprise applications.

As much as I've been irritated with Intel for being intentionally
oblique on the write caching issue -- I think they remain more or less
the only game in town for enterprise use.  The x25-e has been the only
drive up until recently to seriously consider for write heavy
applications (and Greg is pretty skeptical about that even).   I have
directly observed vertex pro drives burning out in ~ 18 months in
constant duty applications (which if you did the math is about right
on schedule) -- not good enough IMO.

ISTM Intel is clearly positioning the 710 Lyndonville as the main
drive in database environments to go with for most cases.   At 3300
IOPS (see http://www.anandtech.com/show/4452/intel-710-and-720-ssd-specifications)
and some tinkering that results in 65 times greater longevity than
standard MLC, I expect the drive will be a huge hit as long as can
sustain those numbers writing durably and it comes it at under the
10$/gb price point.

merlin

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Subject: Re: Contemplating SSD Hardware RAID
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