I replaced my 3TB disk1 with a precleared 6TB and let the data rebuild. It rebuilt with no errors. After the rebuild I have now run a non correcting parity check as per the unRAID unofficial manual. I have noticed that the disk1 has 134 writes and the parity has 111 writes but no errors on any drive. Both of these drives are new within a few weeks. Can anyone tell me why Im getting writes on disk1 and the parity as I though running a non correcting check didn't write anything.

Thanks

Even though you haven't changed any user data to the drives, unraid still writes to the drives in the housekeeping area, and that shows up in the write counts. It's totally normal, nothing to worry about.

Thanks Jonathanm, is it still recommended to run a non correcting parity check after doing a data rebuild? Is it the error count that I should worry about. Im trying to understand what the writes are for though?

is it still recommended to run a non correcting parity check after doing a data rebuild? Is it the error count that I should worry about.

Definitely. When you rebuilt the drive, the data was written based on the contents of all the other drives, so a parity check should show zero errors. If it doesn't, it means that the data written wasn't committed to the drive properly, so the rebuild wasn't truly successful. Non- correcting means that the inconsistencies are noted, but not changed, so you can take another shot at rebuilding.

great thanks, the writes to the disk1 and parity are at 217 and 184 and its 60% through the non corrupting parity chaco with no errors. What is it actually doing?

 

Thanks Jonanthanm