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Re: 32G SSD - Poor Performance on 4.3

From: John Jackson (openbsdlacutt.com)
Date: Tue Apr 29 2008 - 18:07:59 CDT

Keep in mind that all Solid State Disks are NOT the same. I made the
same mistake and purchased a Transcend 8 GB model. My 8 GB model used
old technology and not the newer, faster flash. It was noticeably
slower than traditional spinning disks.

Just check some of the published specs and benchmarks and compare:
http://www.anandtech.com/storage/showdoc.aspx?i=3133&p=5
http://www.transcendusa.com/support/dlcenter/datasheet/SSD25S%20Datasheet%20v1.03.pdf
(look at page 3 of that pdf)

More reading from a vendor: http://www.dvnation.com/ssdfaq.html

John

On Tue, Apr 29, 2008 at 09:35:15AM -0400, Morris, Roy wrote:
> I have been reading around the archives a bit and found a few
> references to using 4.3 to get the full performance out of a
> Transcend SSD but my results are showing that the drive is
> slower on all fronts. I am wondering if anyone has tried these
> tests and what the results might have been?
>
> Anyone know if there is a magic switch I can throw to make
> the OS use this type of drive at full speed?
>
> Thanks
> Roy
>
> Drive: Transcend TS32GSSD25-M (32G)
> OS - 4.3 snapshot from 04/28/2008
>
>
> PE 350 - Regular HD (Write Time)
> roy:/home/rmorris$ dd if=/dev/zero of=testfile.blk bs=65536 count=16384
> 16384+0 records in
> 16384+0 records out
> 1073741824 bytes transferred in 55.392 secs (19384111 bytes/sec)
>
> PE 350 - SSD HD (Write Time)
> # dd if=/dev/zero of=testfile.blk bs=65536 count=16384
> 16384+0 records in
> 16384+0 records out
> 1073741824 bytes transferred in 176.273 secs (6091344 bytes/sec)
>
> PE 350 - Regular HD (Read time)
> roy:/home/rmorris$ dd if=testfile.blk of=/dev/null bs=65536 count=16384
> 16384+0 records in
> 16384+0 records out
> 1073741824 bytes transferred in 40.165 secs (26732730 bytes/sec)
>
> PE 350 - SSD HD (Read Time)
> # dd if=testfile.blk of=/dev/null bs=65536 count=16384
> 16384+0 records in
> 16384+0 records out
> 1073741824 bytes transferred in 50.842 secs (21118975 bytes/sec)