I had to do a complete new setup on my unraid box.  When I run parity sync, it says Parity Sync/Rebuild data in progress.  I don't know what data it's rebuilding.  I just rearranged the drives.  I'm worried about losing existing data from a rebuild.  Or is this just generic labeling.  If data needs rebuilding it will, if parity just parity.  Thanks for any help.

It's generic for v6.2, it means Parity Sync and/or Data Rebuild.

Outstanding, thanks!

You can see what is rebuilding by looking at the writes column. A disk being rebuilt will have a lot of writes.

And the icon, parity sync/data rebuilds have a orange triangle next to the disk.