From: Scott Carey <scott@richrelevance.com>
To: Merlin Moncure <mmoncure@gmail.com>
To: Greg Smith <greg@2ndquadrant.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Intel SSDs that may not suck
Date: Wed, 6 Apr 2011 17:42:17 -0700
Message-ID: <C9C25042.2EB49%scott@richrelevance.com> (raw)
In-Reply-To: <BANLkTi=GsyBfq+ApWPR_qCA7AN+NqT=zww@mail.gmail.com>
On 4/5/11 7:07 AM, "Merlin Moncure" <mmoncure@gmail.com> wrote:
>On Mon, Apr 4, 2011 at 8:26 PM, Greg Smith <greg@2ndquadrant.com> wrote:
>>
>> If you really don't need more than 120GB of storage, but do care about
>> random I/O speed, this is a pretty easy decision now--presuming the
>>drive
>> holds up to claims. As the claims are reasonable relative to the
>> engineering that went into the drive now, that may actually be the case.
>
>One thing about MLC flash drives (which the industry seems to be
>moving towards) is that you have to factor drive lifespan into the
>total system balance of costs. Data point: had an ocz vertex 2 that
>burned out in ~ 18 months. In the post mortem, it was determined that
>the drive met and exceeded its 10k write limit -- this was a busy
>production box.
What OCZ Drive? What controller? Indilinx? SandForce? Wear-leveling on
these vary quite a bit.
Intel claims write lifetimes in the single digit PB sizes for these 310's.
They are due to have an update to the X25-E line too at some point.
Public roadmaps say this will be using "enterprise" MLC. This stuff
trades off write endurance for data longevity -- if left without power for
too long the data will be lost. This is a tradeoff for all flash -- but
the stuff that is optimized for USB sticks is quite different than the
stuff optimized for servers.
>
>merlin
>
>--
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To: pgsql-performance@postgresql.org
Cc: scott@richrelevance.com, mmoncure@gmail.com, greg@2ndquadrant.com
Subject: Re: Intel SSDs that may not suck
In-Reply-To: <C9C25042.2EB49%scott@richrelevance.com>
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