I added a new hard drive and was preclearing it. (Planning on replacing my parity)

I wanted to move all the contents of my disk4 to disk5 since I was getting very slow read/write speeds on disk 4 ( Based on diskspeed docker)

 

I was using the unbalance plugin to move all the contents from Disk4 to disk5 and it was moving at like 1-3MB/s. After waiting for 30minutes I got a bunch of notifications saying that the arrray has errors (Array has 6 disks with read errors) and Disk 5 had an error (Disk dsbl) alert.  My Unraid GUI became unresponsive and I couldn't SSH into it as well. I force rebooted my server as that was my only option...When I rebooted I saw that disk5 had an x on it saying there was an error. I tried to rebuilt parity but my server froze again and right before it froze I saw that there were a bunch of messages saying "xfs metadata i/o error xfs_trans_read_buf_map unraid". I rebooted and now the x is back in disk 5 and errors on my last parity check. I'm performing a Read-Check. I'm scared to continue doing anything including preclearing my new drive and I'm not sure what is going on.

Can you please check over my logs. thank you

 

unnas-diagnostics-20190924-0347.zip

Edited September 24, 20196 yr by bobokun

Ideally we'd want the diags before rebooting to see what happened, but the disabled disk looks fine and errors on two disks at the same time suggest more a connection/power issue, so check/replace cables and rebuild.

I got two CRC Errors on my new drive that I was preclearing /dev/sdd and then I got a Preclear Fail on Post-Read. I'm not sure what I should do...should I try to replug sata cables again and preclear the drive again? Here is the preclear log and new diagnostics...

 

ppreclear_disk_JEHBR8AN_21792.txtunnas-diagnostics-20190924-2118.zip

Edited September 24, 20196 yr by bobokun

CRC errors are usually a bad SATA cable, replace it.

I have a miniSAS to 4 sata cable that it was plugged into. Should I replace the whole mini SAS to 4 port cable? 

Replace or swap with another and see if the errors follow the cable or not.

Is it safe to replace the cable while unraid is on if the drive is not mounted? (unassigned). I'm in the middle of a parity sync/data rebuild 27hours in and don't want to restart it and start the rebuild all over just for replacing the cable.

Edited September 25, 20196 yr by bobokun

Technically Yes, but I'd avoid it as the Sata connectors are terrible to begin with, and breathing too hard (or touching) another one could begin to give problems on another drive which is the last thing you want in the middle of a rebuild.

Okay good idea. I'll wait until the rebuild is finished. Swap the sata cable and do another preclear