I was attempting to transfer some data from disk1 to disk8 in my array (I want to move all my data disk from ReiserFS to XFS). At some point in this ungodly slow transfer (60 KB/s, at times), disk8 started generating errors. This, of course, angered unRAID and it flagged disk8 as bad. A SMART test of the drive revealed it was fine. Nonetheless, due diligence warranted I replace the power and Sata cables connected to that disk. There was no Trust Array option I could find in 6.x, like I used to see in 5.x. So, I swapped out disk8 with a hot spare, pre-cleared disk, and initiated the Data Rebuild. It started slow, like usual, at 2.5MB/s. When I checked back, a few minutes later, it still was showing the rebuild at 2.5 MB/s. This struck me as odd, because when I upgraded the system last week, one of the first things I did was test the pre-clear process on a new disk. That was running at 170 MB/s, at times (This was an increase over what I'd seen with my old CPU, Mobo, and RAM ~130 MB/s peak). So, my expectation was that Data Rebuilds might also be a little faster than before. The last one I did peaked at ~70 MB/s. The slow rebuild continued for 12 hours overnight, still at 2.5 MB/s.

 

I've attached the unraid-diagnostics report. I'm not sure what the root cause may be. But, this is extremely frustrating and I'm at a loss as to why things would be so slow with the huge upgrades I just did.

 

Old CPU, Mobo, RAM:

Intel i3 (Don't recall the model. 2130 perhaps?)

Gigabyte Z68MX-UD2H-B3

4GB Ballistix RAM

 

New CPU, Mobo, RAM:

Intel i7 6700K

Gigabyte Z170X-Gaming 7 Rev 1.0

32GB GSkill Ripjaws

 

Any ideas as to what the issue may be?

 

Thanks, in advance, for your time.

 

P.S. Also running firmware 21 for my SuperMicro AOC-SASLP-MV8 Controller

unraid-diagnostics-20160706-1359.zip

There's no rebuild going on the syslog you posted, wrong diagnostics?

It looks as though you grabbed the diagnostics immediately after rebooting as the syslog shows less than two minutes of up-time.

Yes. Sorry.

 

That file was generated just after I re-checked the BIOS to see if I'd missed any settings I needed to change, and prior to re-starting the Re-Build. Here's a new one.

unraid-diagnostics-20160706-1452.zip

See this thread, you having the same problem, irq 16 used by your SAS card is getting disabled, try the advice from the other thread, although you can't upgrade unRAID, unless you go to v6.2-beta.

 

 

@johnnie.black, Thanks for that info.

 

I have the latest BIOS for my mobo. I have the latest version of unRAID (I only count stable, release versions). I've rebooted several times. At this point, the only option I see, if it's an IRQ issue, is to go into the BIOS and look for crap to disable. I will try that now.

 

If anyone has any other ideas, please feel free to chime in.

You may also try the SASLP in a different slot, if available.

 

 

Did you see this thread, which was referenced by the one johnnie pointed you too? There's some useful information there.

 

I had the controller in a PCIe 16x slot. I seem to recall reading something about others having issues with that and my controller card. I've moved it to another slot. Will begin testing shortly.

Eureka!! Night and Day difference! 77.1 MB/s Data Rebuild now.

 

Thanks for the head bonk @johnnie.black!!

 

And remember kids... the AOC-SASLP-MV8 Controller DOES NOT LIKE the 16x PCIe slot! Seems to dig the 8x slot on my mobo.