I'm pretty sure the answer to this question is "yes", but is it safe to skip the parity check/sync when adding a new disk to your array IF the disk is already pre cleared? The parity (even in a dual parity drive setup) should be unchanged if the new drive being added to the array is all zeros, right?

 

Thanks.

Edited February 18, 20206 yr by unraidun

1 hour ago, unraidun said:

I'm pretty sure the answer to this question is "yes", but is it safe to skip the parity check/sync when adding a new disk to your array IF the disk is already pre cleared? The parity (even in a dual parity drive setup) should be unchanged if the new drive being added to the array is all zeros, right?

 

Thanks.

Adding a new drive to the array should never cause a parity check/sync (unless you are adding a new parity disk!).  If the system recognises that the disk is pre-cleared when you add it as a new data disk Unraid will skip the phase of clearing that disk and add it immediately, and otherwise it will clear the drive.  If the system wants to do a parity check/sync then it is due to something other than adding the new drive

Ahhh ok I was indeed adding a new parity disk.

 

So it's doing a parity sync now, but I still have a couple un assigned drives (pre cleared) waiting to be added. So when the parity sync is finished, you're saying I can safely check the 'skip the parity sync' check box when adding the remaining (non parity) drives?

Think what's being said is they you need to do nothing when adding a precleared disk. A parity check won't be triggered so no need to tick anything anywhere. Just add the disks.

*yup looks like the 'is parity already valid' check box doesn't even exist unless you're adding a Parity drive.

 

Just added the pre cleared drives and everything looks good. Marking as Solved.