isuelt Posted September 24, 2018 Share Posted September 24, 2018 Hey guys I'm still trying to solve an issue with these Hitachi HUS72404CLAR4000 drives. I was wondering if anyone had any ideas. Problem: In an UnRaid array they get a sustained transfer between 40 - 46 MB/s write speed - NO Parity drive; single drive array. But mounted as an Unassigned Device they get a sustained transfer ~ 76 - 80 MB/s These write tests are done: - using Krusader from Unassigned drive --> array and array --> unassigned drive - Reboots between any setting change/test Things I've done so far: - turned Turbo Write on and off - Tested multiple drives (of this kind) in ***3 different motherboards and RAM*** Drive info Vendor: HITACHI Product: HUS72404CLAR4000 Revision: C370 Compliance: SPC-4 User capacity: 4,000,787,030,016 bytes [4.00 TB] Logical block size: 512 bytes LU is fully provisioned: Rotation rate: 7200 rpm Form factor: 3.5 inches Logical unit id: 0x5000cca073a37b40 Device type: disk Transport protocol: SAS (SPL-3) Local time: Mon Sep 24 12:21:00 2018 PDT SMART support: Available - device has SMART capability. SMART support: Enabled Temperature warning: Enabled SMART health status: Passed Link to comment
trurl Posted September 24, 2018 Share Posted September 24, 2018 Turbo Write has no meaning without parity. A better test would be to leave Krusader out of it and just go to the command line for the copy. Even better would be to leave reading the other disk out of it and just write to the disk. Have you tried the DiskSpeed docker? Link to comment
isuelt Posted September 24, 2018 Author Share Posted September 24, 2018 Here's the results from that: Drive ID: sdc Vendor: HITACHI Model: HUS72404CLAR4000 Revision: 0 Capacity: 4TB Logical/Physical Sector Size: 512/512 Link to comment
JorgeB Posted September 24, 2018 Share Posted September 24, 2018 Any difference in performance if you transfer to a disk share instead of an user share? Link to comment
isuelt Posted September 24, 2018 Author Share Posted September 24, 2018 No. No difference. Link to comment
JorgeB Posted September 24, 2018 Share Posted September 24, 2018 Very strange, no more ideas though. Link to comment
isuelt Posted September 24, 2018 Author Share Posted September 24, 2018 I thought that maybe this " Logical/Physical Sector Size: 512/512" verses "Logical/Physical Sector Size: 512/4096" on a WD Red drive would have something to do with it, but it doesn't seem to matter the way I set the "Disk Settings" -> "Default Partition Format" Link to comment
JorgeB Posted September 25, 2018 Share Posted September 25, 2018 No, that shouldn't make any difference. Link to comment
Ramon Posted October 7, 2018 Share Posted October 7, 2018 I found your post because I was having the same issue, oddly I first noticed it on only one of the drives when I was pre-clearing them. the write speed dropped to about 40 MB/s, it only happened when writing zeros on one drive, all other stayed at about 180 MB/s when writing zeros. however, after adding the drives to an array, I confirmed that they would all start writing at the expected gigabit network speed of about 110 MB/s, but then drop to 45 MB/s with a few minutes. the solution was setting the write cache to enabled as described here: https://forums.unraid.net/topic/72862-drive-write-speeds-really-slow-solved/?do=findComment&comment=670028 Link to comment
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