I am syncing parity and later started to pre-clear another 18tb disk. I later notices that the parity progress was stuck at 3.5% / 991GB even though all disks were being read/written to at around 250mbps. I tried hitting pause several times and then stop but neither had any effect.

 

Diagnostics download also got stuck on the smartctl command for the 18tb disk being pre-cleared. I then stopped the pre-clearing which seems to have fixed both issues though annoyingly cancelled my sync even though the button had no effect when pressed at the time.

 

I also tried formatting a disk multiple times but it had no effect, just shower it as formatting but then nothing not even an error. After I stopped pre-clearing disk is formatted already.

 

Is this a bug with Unraid or something I can fix on my end?

 

 

unraid-diagnostics-20250310-1330.zip

Edited March 10, 20251 yr by dominicm

I am afraid that if you are running a pre-clear then this is a side effect that I suspect cannot be avoided.   It happens if the operation you request issues a 'sync' system call at the Linux level, but the preclear running stops that from succeeding.

Basically any operation that does a system-level sync to ensure all pending writes are committed will get hung if a preclear write phase is running because the preclear is constantly writing, it'll only exit once that's over.

 

So if you have to run such operations pause the preclear. All your button presses will have been executed but they were all waiting for the writes to stop, once you paused they all ran to completion.

Edited March 10, 20251 yr by Kilrah

20 minutes ago, itimpi said:

side effect that I suspect cannot be avoided.

Could disable all the start/stop/pause buttons when a preclear is running with a message just like for when mover runs. 

56 minutes ago, Kilrah said:

Could disable all the start/stop/pause buttons when a preclear is running with a message just like for when mover runs. 

Maybe, but do not forget that Preclear is not a standard part of Unraid so it would be the responsibility of the plugin implementing Preclear to do this.

I should add that it appears the parity sync progress is actually working fine while pre-clearing a disk until formatting a disk, then you loose progress. Cancelling pre-clearing fixes it again.