I am rebuilding a disk (actually upsizing to new disk).  The array is online, and the disk being rebuilt shows an orange (yellow?) ball,  which leads me to believe that you can read and write to all disks.  How does unRAID handle this?  Does it somehow merge a write to a file that it "rebuilding" from the parity and other disks?  This seems hard to do.

 

BTW, it says that it is rebuilding at 54 Mb/sec.  Does this seem reasonable?

 

 

Yes, you can use the array while the drive is rebuilding.    UnRAID will manage the changes just fine.

 

Nevertheless, I always try to minimize activity when the array is doing parity syncs, parity checks, or drive rebuilds ... just seems like a good idea 

Yes, you can use the array while the drive is rebuilding.    UnRAID will manage the changes just fine.

Correct.

 

Nevertheless, I always try to minimize activity when the array is doing parity syncs, parity checks, or drive rebuilds ... just seems like a good idea 

Not necessary to minimize activity, but things do slow down when parity sync is active.

Yes, you can use the array while the drive is rebuilding.    UnRAID will manage the changes just fine.

Correct.

 

Nevertheless, I always try to minimize activity when the array is doing parity syncs, parity checks, or drive rebuilds ... just seems like a good idea 

Not necessary to minimize activity, but things do slow down when parity sync is active.

I minimize activity to hopefully prolong the drive health since a data drive (and parity drive if writing) will be seeking more if you are reading or writing to the array while a parity sync, check or rebuild is going on.