Hello,

I noticed today that my array went into degraded mode.  I dug into the diagnostics info (attached), to find a lot of sd 1:0:x:0: Power-on or device reset occurred messages as well as disk0 read errors and disk3 read/write errors.  Most of the device reset messages are for sd 1:0:1:0 and the rest are for sd 1:0:2:0. 

 

I have taken the array offline.  

 

A short smart test on disk0 and disk3 shows a pass but I see the UDMA CRC error count is > 0 for both of these drives (and not the others).  

 

All of the drives and the controller are new (~1 month old).  My initial guess (hope?) is there is a cable issue but I was wondering if there is anything else I can do *before I power off the machine* and lose state info.  If not, I'm hoping to find the same cable hooking to the two drives in question and I can just replace it and it will work fine. 

 

But I've never had a failure in my UnRAID array so I want to make sure I'm covering all my bases.

 

Thanks,

Adam

unraid-diagnostics-20190807-1608.zip

Pls check does air-flow on LSI HBA enough and run extend SMART test to confirm disk itself in health. Cable may be the issue too.

If disk3 and parity have something in common like a miniSAS cable or a power cable/splitter replace/swap them with different disks, and see what the problem follows.

Thanks guys,  I did a long smart test on both drives overnight and they both passed.  I moved my cache drive (on a pcie card) as far away from the drive controller card as possible and put a small extra fan on that area.  Finally it looks like the two drives in question were on the same miniSAS cable, so I replaced that.  further, I moved one of those two drives onto the other "side" of the drive controller so they do not share a cable anymore (even though it would be the new cable).

 

I'm doing a rebuild now.  Fingers crossed!

 

Luckily, I have backups of the important stuff... and my old unraid setup with old drives which I just replaced ~1 month ago.

Actually, it turns out it may just be that "half" of the drive controller.  after I started the rebuild, drive 2 started getting crc errors.  I moved drive 2 to the new cable when I moved drive 3 off.  So I canceled the rebuild and moved all the drives to the apparently working half of the controller.  No problems yet with the 2nd try at rebuilding and it's over 50% already.  I guess I need to by another new drive controller

Good to shoot that.