August 3, 20196 yr I have 2 Hitachi HUS723030ALS640 3TB drives and when running anything else besides parity rebuild I can get about 150MB/s from each disk read and write. When I try to rebuild the parity (using the drive as the parity drive) with one of these drives the speed is stuck at 26MB/s and will not go any higher. I have tried using a different disk (a seagate disk) and it will parity sync about around 110MB/s Is there some issues wit unraid and these disks? I am not sure what is going on here... Edited August 3, 20196 yr by JeffJeff
August 3, 20196 yr Community Expert Go to Tools-diagnostics and attach the complete Diagnostics zip file to your next post.
August 3, 20196 yr Community Expert Write cache for both parity disks is disabled, you should be able to turn it on with: hdparm -W1 /dev/sdX Might go back to default after a reboot.
August 3, 20196 yr Author # hdparm -W1 /dev/sdd /dev/sdd: setting drive write-caching to 1 (on) SG_IO: bad/missing sense data, sb[]: 72 05 20 00 00 00 00 28 00 0a 00 00 00 00 00 00 00 00 00 00 02 06 00 00 c0 00 00 00 03 02 00 00 SG_IO: bad/missing sense data, sb[]: 72 05 20 00 00 00 00 28 00 0a 00 00 00 00 00 00 00 00 00 00 02 06 00 00 c0 00 00 00 03 02 00 00 write-caching = not supported
August 5, 20196 yr Community Expert Sorry, those are SAS devices, see here: https://forums.unraid.net/topic/72862-drive-write-speeds-really-slow-solved/?do=findComment&comment=670028
August 5, 20196 yr Author I believe that fixed my issue. as soon as I enabled it it jumped from 26MB/s to 173 MB/s 😃
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