I had a 8TB parity drive in place, upgraded to a EXOS X20 20TB drive.  Stopped array, assigned 20TB in place, started array - currently running around 30 MB/s, estimating 5 days to complete.  This drive should run around 250+ MB/s - think something is going on?  Should I have formatted the drive before replacing the parity drive?  It's fluctuating between 7-30 days to complete:

 

 

Any help is appreciated. 

 

-Russ

Many don't understand "format". Format means "write an empty filesystem to this disk". In all OS. Parity has no filesystem, and rebuild would completely overwrite that empty filesystem anyway. So, no need to format.

 

I mention all this because people have made a serious mistake when needing to rebuild a data disk, and end up rebuilding an empty filesystem.

 

5 minutes ago, russdyer77 said:

Any help is appreciated. 

Attach Diagnostics ZIP to your NEXT post in this thread.

How is the drive connected to the system?

How are the other drives connected to the system?

Edited April 8, 20251 yr by MowMdown

1 hour ago, trurl said:

Attach Diagnostics ZIP to your NEXT post in this thread.

 

I run those exos 20TB drives. Parity runs at damn near 280MB/s takes about 1.5 days to build parity. I can't comment on why you are getting 23MB/s something is definitely wrong.

 

What other drives do you have in your system? Its going to get dragged down to the slowest drive.

Thanks all, sorry for the delay in response - actually now running around 150 MB/s and has under 3 hours to go. Diags attached.  Drives are now all in a newly built disk shelf using an old SuperMicro server (SM JBOD board and SAS cables from backplane back to main PC to LSI SAS9211 card) so maybe more latency there but didn't think there would be over direct to the LSI card. 

unruss-diagnostics-20250410-1703.zip