August 23, 20196 yr Ok, have an array in which Seagate 4x ST4000VN000 and 2x ST6000VX0001 models cannot have WC enabled, Ive hunted/youtubed and tried both the SAS(sdparm --set=WCE /dev/sdX) and SATA(hdparm -W 1 /dev/sdX) strings do not work, I can however enable/disable the 4x Seagate ST8000DM004 without issue, all running off the same controller FCP does warn that WC is disabled, same result plugged into the controller/HBA or direct off SATA/motherboard, no firmware updates detected for the drives if I plugin to a windows host, everything is updated as this array build is a few days old Topology: Hard Drives Intel Intel RES2SV240 Expander LSI SAS 9211-8i flashed to IT mode fw 20 to case backplane Hit a deadend so far Any suggestions people?
August 23, 20196 yr Author Ok transfering from drive to drive via Krusader shows no speed issues getting around 170mb a sec.....transferring to actual share in array....40mb for the same spec drives....thats with WC off(Cant turn on)
August 24, 20196 yr Author Any ideas team? Krusader transfers at full speed @170mb/s, via array? flagged as write cache disabled and super slow 40mb/s
August 25, 20196 yr There are several post about write performance drop if disk write cache in disable. I have googling something, may help, but the exe file not come from microsoft, so take your own risk. And I can't confirm the exe file could help or not. https://social.technet.microsoft.com/Forums/windowsserver/en-US/285f8cef-2a6c-4a23-ae12-a6755b2f9407/event-id-32disable-write-caching-on-the-disk Download file http://thehotfixshare.net/board/index.php?autocom=downloads&showfile=1113
August 25, 20196 yr Author Ok, googlefu...changed the NCQ of the array drives from 1 to 31 and speed has increased dramatically, doing a clear on 2 drives, gone from 38mb/s to 130mb/s as soon as I made the change, I am a happy camper!, I was about to hit the go button on another HBA controller! Command to change your NCQ level is echo 31 > /sys/block/sdX/device/queue_depth sdX is your device, echo XX is the level you want to change to
August 25, 20196 yr Author 21 minutes ago, Benson said: There are several post about write performance drop if disk write cache in disable. I have googling something, may help, but the exe file not come from microsoft, so take your own risk. And I can't confirm the exe file could help or not. https://social.technet.microsoft.com/Forums/windowsserver/en-US/285f8cef-2a6c-4a23-ae12-a6755b2f9407/event-id-32disable-write-caching-on-the-disk Download file http://thehotfixshare.net/board/index.php?autocom=downloads&showfile=1113 I guess there is more going on, same drive external of array, fast, within array slow, NCQ tweak changed the game for me so far!
August 25, 20196 yr Just now, DaMAN said: NCQ tweak changed the game for me so far That's good. But say truly, this is disk issue and this work around help much. I also read a post, seems Seagate address the issue and change on new drive model. https://community.synology.com/enu/forum/6/post/122610?page=3 Edited August 25, 20196 yr by Benson
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