Technogod Posted July 28, 2014 Share Posted July 28, 2014 I have two Corsair Neutron 256GB SSD's in a RAID 0 configuration. Refer to my profile for hardware configuration. I've run multiple benchmarks and my sequential read speed is 390 MB/s and my sequential write speed is 803 MB/s. Why is my read speed so much slower? Intel RST Driver 11.7.0.1013 Data Stripe Size 16K Write-back cache enabled Windows write-cache buffer flushing off Link to comment Share on other sites More sharing options...
wytnyt Posted July 28, 2014 Share Posted July 28, 2014 write will always be half of your read speed,,least it does on my evo's... are you looking at it correctly? Link to comment Share on other sites More sharing options...
Technogod Posted July 28, 2014 Author Share Posted July 28, 2014 Yes, I'm looking at it correctly. Refer to attachment. Link to comment Share on other sites More sharing options...
wytnyt Posted July 28, 2014 Share Posted July 28, 2014 yes i see,, seems to me read should be higher but even so it seems as your write speed is too high id be also interested in seeing this resolved myself im sure another will pop in and assist. have you tried other benching progs? Link to comment Share on other sites More sharing options...
Toasted Posted July 28, 2014 Share Posted July 28, 2014 Run a ATTO benchmark and post a screenshot. Link to comment Share on other sites More sharing options...
Technogod Posted July 28, 2014 Author Share Posted July 28, 2014 See attached ATTO screenshot. Link to comment Share on other sites More sharing options...
Toasted Posted July 29, 2014 Share Posted July 29, 2014 Have you tried different SATA data cables? Latest BIOS and chipset drivers? Were there any background processes running? E.g. anti-virus scans, etc? The last option would be to backup your data and secure erase the SSD with Parted Magic or similar. Note: A secure erase will break your RAID array as well as permanently delete ALL data on the drives. Link to comment Share on other sites More sharing options...
wytnyt Posted July 29, 2014 Share Posted July 29, 2014 toasted,just for my clarification,,read speed should be @ 2x of the write speed right... Link to comment Share on other sites More sharing options...
Toasted Posted July 30, 2014 Share Posted July 30, 2014 Theoretical yes, but it will be lower in some cases e.g. different chipset, OS drive, etc. Link to comment Share on other sites More sharing options...
Technogod Posted July 31, 2014 Author Share Posted July 31, 2014 I fixed the problem. Problem was the stripe size. Intel RST Utility recommended a 16K stripe size for best performance. This is incorrect. I had always ran a 64K stripe size on my previous RAID arrays. I found 128K gave me the best performance. I'm getting around 800MB/s read and write speeds. Link to comment Share on other sites More sharing options...
Toasted Posted July 31, 2014 Share Posted July 31, 2014 Thanks for the update, never knew the strip size affected performance. I've tried multiple strip sizes on a X58 platform before which never impacted performance. I guess i learn something new everyday :). Link to comment Share on other sites More sharing options...
autotech Posted August 17, 2014 Share Posted August 17, 2014 I have 2 x force gt and with 128 stripe I do about 1000 read and write but toolbox shows no smart info and I cant manually run trim. Link to comment Share on other sites More sharing options...
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