Need I be concerned, or do anything, because of 115 errors?

 

No - you really want 0 errors.

 

Was it a parity sync or a data rebuild that was running?

it was a rebuild after replacing disk 1 of 6.  I was also having trouble with disk 3, and I am replacing that next.

Edited May 6, 20215 yr by xrqp

Every error indicates a possibly corrupt sector on the rebuilt disk so not a good sign.    Whether those sectors are within files, metadata or free space is impossible to tell.  Do you have backups os anything important or hard to replace?

For Disk 1 and 3, Yes, I have backups.  Most of it is not too important.  

For the rest of the 6 disks, the data is important, and is backed up.

I am guessing 115 errors could all be in one sector (if I am lucky), or in up to 115 sectors.  

 

It didn't tell me which drive, or is it saying it is the parity drive?

 

If I can figure out which drive it is, Should I replace it, or just keep an eye on it and see if errors increase?

Edited May 6, 20215 yr by xrqp

You really need to post your diagnostics. Tools -> Diagnostics. Post the resulting zip file.

Here are diagnostic in reverse chronological. 

Here is just now May 6, while my Disk 3 replacement is doing parity rebuild (45% done). 

tower-diagnostics-20210506-1912.zip

 

Here is my diagnostics May 4, before I replaced 3, but I think before i replaced Disk 1 (not sure).

tower-diagnostics-20210504-2333.zip

 

Here is my diagnostics from May 3, before I replaced any disks.

tower-diagnostics-20210503-0046.zip