[Bglug] ssd testing using fio

[Logan Streondj]

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Hi,

just to save people the trouble of testing SD cards,
there is a list of pre-tested SD cards that work well with RPi
it is continuously updated, and is where I go to find what the best SD
cards on the market are.

http://elinux.org/RPi_SD_cards#SD_card_performance

Currently I have a sandisk extreme 16GB,
mostly because they have read and write speed in excess of 19MB/s and
was only $23 with shipping on ebay.

Hope that helps.

On 16-07-06 11:50 AM, Andrew Howlett wrote:
> hi everyone,
> 
> i've been installing SSD's for many clients and have noticed that
> some SSD's perform better than others. but it can be hard to tell
> from the manufacturer's marketing crap exactly what to expect from
> different drives.
> 
> there was a good article in a recent Linux Pro Magazine suggesting
> the command line utility fio is the best way to test SSD's in
> linux. The fio HOWTO is here:
> 
> https://github.com/axboe/fio/blob/master/HOWTO
> 
> fio requires a "jobfile" which describes the test(s) to run. here's
> an example jobfile for ssd testing:
> 
> # Do some important numbers on SSD drives, to gauge what kind of #
> performance you might get out of them. # # Sequential read and
> write speeds are tested, these are expected to be # high. Random
> reads should also be fast, random writes are where crap # drives
> are usually separated from the good drives. # # This uses a queue
> depth of 4. New SATA SSD's will support up to 32 # in flight
> commands, so it may also be interesting to increase the queue #
> depth and compare. Note that most real-life usage will not see
> that # large of a queue depth, so 4 is more representative of
> normal use. # [global] bs=4k ioengine=libaio iodepth=4 size=10g 
> direct=1 runtime=60 directory=/mount-point-of-ssd 
> filename=ssd.test.file
> 
> [seq-read] rw=read stonewall
> 
> [rand-read] rw=randread stonewall
> 
> [seq-write] rw=write stonewall
> 
> [rand-write] rw=randwrite stonewall
> 
> 
> 
> i'm going to test and compare several drives this weekend. will
> post results on sunday night ...
> 
> andrew h.
> 
> 
> 
> 
> _______________________________________________ Group mailing list 
> Group at bglug.ca http://bglug.ca/mailman/listinfo/group_bglug.ca
> 

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