September 12, 201411 yr In the process of converting movies to MKV on my oldest unRaid box and have started to have severe slow downs in writes to the disks both from attached USB external drives and across the network. Tested speed to the newer box and getting upwards 28 MBps (~250 Mbs) over network with simple copy paste of a 28GB mkv from W7 box to a test folder on the unRaid. The older box I am lucky to get 10 MBs either over network or from attached usb drive. I have been working through the 13 drives doing the conversions with normal speeds up until now... the slowdown cropped up yesterday with disk 8. All 2TB WD green drives, no red balls. SMART shows no errors. I tested a copy to disk 9 and same slow speed. Just tested copy to disk 1 and getting full speed. Hmmm... 1-5 are onboard sata, 6-13 on an AOC-SASLP-MV8. I updated firmware on card to .21 but no change in speed. ideas?
September 13, 201411 yr How full are the disks? Write speed can get pretty bad on the last 10% or so.
September 13, 201411 yr Author Temp. Size Used Free 33 °C 2 TB 413 GB 1.59 TB swapped in new breakout cable. No effect. 10.9 MBs I guess I can swap in the the card from the other server and see if this one is bad. -------------------- okay that had no effect either.
September 13, 201411 yr Author I have one of the 5 TB Toshiba as my parity on this box. Could that be involved?
September 13, 201411 yr Author More information, not sure if it is relevant. This server has been full for over a year. Not much written to it for a while. During my conversion process I found two disks were set to read-only (connected to on-board sata, not the card) as they had some FS corruption. I ran "reiserfsck --check" on all the drives and --rebuild tree (if recall correctly) on those two drives. All the other drives no corruption was found. smart attached smart_disk8.txt
September 15, 201411 yr Author New theory. I think the Toshiba 5TB (extracted from a retail external drive package), which is the Parity disk in this server, has a neutered firmware that may be interacting in a strange way with the AOC-SASLP-MV8 attached drives (mobo attached drives have normal write speed). I spotted what might be a clue with all the repeated troubleshooting reboots... the Asus M4A785-M BIOS is reporting the Toshiba as UDMA 5 and all the older WD 2TBs as UMDA 6. UDMA detection was set to auto and trying to set it manually to 6 was not possible as it was not an available option in the drop down; 5 was the highest for the Toshiba. Found the latest Asus BIOS and applied it. No change to detection of the Toshiba, write speeds still in the dumper. I had a newish WD 2TB sitting here and I have swapped it in place of the Toshiba. Parity synch in progress and fingers crossed that it is the solution. PS. mobo reports the replacement WD as UDMA 6. QUESTION: is it safe to try and do some writes to the affected disks to test speed? Is it even useful to try unless the parity synch is done (speed degraded due to that process)?
September 16, 201411 yr Author Parity-synch is done. Write speeds still at half normal. I am at a loss as to why.
September 20, 201411 yr Author sent email to support couple days ago referencing this thread. No reply so I guess I am out of luck.
September 20, 201411 yr Hmm, didn't see the email. Sure you put the hyphen in for lime-technology.com? No bounce messages from your mail provider. Drop me an email at [email protected] if this issue persists for you.
September 20, 201411 yr Author sent it to [email protected] The problem still persists. I am still running the conversions off the slow drives but its taking twice as long. Let me know what I can provide you for troubleshooting. My last ditch option will be to replace the motherboard. Trying to avoid that expense. ps. email was sent Tuesday 16th
September 20, 201411 yr sent it to [email protected] The problem still persists. I am still running the conversions off the slow drives but its taking twice as long. Let me know what I can provide you for troubleshooting. My last ditch option will be to replace the motherboard. Trying to avoid that expense. ps. email was sent Tuesday 16th Will have to read through this in its entirety tomorrow. Just got back home an hour ago from a business trip and need to recharge the batteries. Will definitely take a closer look and review the logs...
September 21, 201411 yr Author Just pulled the trigger on a MSI 760GMA-P34(FX) to replace the possibly defective Asus M4A785-M. After tax, reward points and a gift card balance, $24 shipped from Amazon to arrive Tuesday. Even if it doesn't fix it, it will add two SATA ports to the config
September 22, 201411 yr Author It just keeps getting curiouser and curiouser. Last 2 disks (disk 12 & 13) attached to SAS card I am getting full speed writes to the disks over the network. Hmmm... replacement mobo here tomorrow
September 23, 201411 yr Author New motherboard installed without issue. unRaid started right up like nothing had changed. BUT I still have the speed issue on the same drives. Next step is to try replacing the drive(s).
September 24, 201411 yr I don't think you have a hardware issue. Something with a driver seems more likely. When I went from 4.7 to 5.0.5 all the drives in that tower also seemed to lose half their speed. I haven't tried going back to 4.7 to verify it though. Most of that tower is WD Greens and they are painfully slow now. My second tower did the same thing but I upped it to 6b9 recently and it seems to have its mojo back.
October 2, 201411 yr Author Upgraded the server to 6.0-beta10a and writes to the affected disks are at full speed again. Parity check was faster as well (by nearly factor of x2).
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