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SSD performance

From: david(at)lang(dot)hm
To: pgsql-performance(at)postgresql(dot)org
Subject: SSD performance
Date: 2009-01-23 11:35:30
Message-ID: alpine.DEB.1.10.0901230323030.12903@asgard.lang.hm (view raw or flat)
Thread:
Lists: pgsql-performance
I spotted a new interesting SSD review. it's a $379 5.25" drive bay device 
that holds up to 8 DDR2 DIMMS (up to 8G per DIMM) and appears to the 
system as a SATA drive (or a pair of SATA drives that you can RAID-0 to 
get past the 300MB/s SATA bottleneck)

the best review I've seen only ran it on windows (and a relativly old 
hardware platform at that), I suspect it's performance would be even 
better under linux and with a top-notch controller card (especially with 
the RAID option)

it has a battery backup (good for 4 hours or so) and a CF cardslot that it 
can back the ram up to (~20 min to save 32G and 15 min to restore, so not 
something you really want to make use of, but a good safety net)

the review also includes the Intel X-25E and X-25M drives (along with a 
variety of SCSI and SATA drives)

http://techreport.com/articles.x/16255/1

equipped with 16G the street price should be ~$550, with 32G it should be 
~$1200 with 64G even more expensive, but the performance is very good. 
there are times when the X-25E matches it or edges it out in these tests, 
so there is room for additional improvement, but as I noted above it may 
do better with a better controller and non-windows OS.

power consumption is slightly higher than normal hard drives at about 12w 
(_much_ higher than the X-25)

they also have a review of the X-25E vs the X-25M

http://techreport.com/articles.x/15931/1

one thing that both of these reviews show is that if you are doing a 
significant amount of writing the X-25M is no better than a normal hard 
drive (and much of the time in the middle to bottom of the pack compared 
to normal hard drives)

David Lang

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Subject: Re: SSD performance
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