ok,

 

I will start on that.. Only question on copy I got:  if I just copy the data which is part of the share that spans disk4 and other diskX, will the complete data of the share be available?

 

So i just pick another available drive and copy all data into a temp folder? like backup_disk4?  

Use midnight commander (mc on the console) and copy from /mnt/disk4 to another disk, e.g., /mnt/disk5 , shares are all the top folders.

Ok .. All data has been copied over to another drive. What can I do with drive4 to see if it needs RMA or the errors are just bad data?

Start by running and extended SMART test.

Ok took a while. Says completed with errors but Smarts says passed

 

I dont know what errors it is referring 

tower-smart-20171106-1200.zip

The important part is this:

 

Quote

Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended offline    Completed without error       00%     47720         -

 

So the disk appears to be fine, but those errors in unRAID are hardware related, and they looked like a disk problem.

 

Maybe try swapping cables with a different disk and see how it behaves, you need to do a parity check anyway so do it after swapping the cables.

Hi,

 

I moved cables around 2 drives.. "Error" drive and another that was always clean. Tower been running for hours all drives are clean.  I will start parity check I guess.  Strange that errors just went away but happy nevertheless 

 

Thankyou again for your support

BTW.. 

 

should i check off "Write corrections to parity"  ?

 

Check will start Parity-Check. 
Write corrections to parity

25 minutes ago, lennygman said:

should i check off "Write corrections to parity"  ?

 

Yes, since sync errors are expected.

Parity check finished with errors. Drive still showing 0 errors.

 

Last check completed on Tue 07 Nov 2017 09:31:29 PM EST (today), finding 238658 errors. 
Duration: 10 hours, 13 minutes, 54 seconds. Average speed: 81.5 MB/sec

 

Is there anything else I should do?

Keep an eye on it but for now it's OK.

This is an excellent thread explaining how to handle a disk dropping offline and when to and when not to do a rebuild. We had a similar thread last week where a user too quickly did a drive rebuiqld and lost data as a result.