Multiple Vertical Expansions --> Performance Drop? --> 'Refresh' X-RAID2 without Factory Default?

Hi StephenB ,

Many thanks for your reply...

The new disks are Seagate Ironwolf 8TB (ST8000VN004) and the 'reused' 6TB are Seagate Ironwolf (ST6000VN001). I believe these are CMR.

I'm happy to try a Balance first and then the snapshot delete/defrag to see if that yields some improvement.

The maintenance history in the Primary NAS log shows: -

=== maintenance history ===
device operation start_time end_time result details
---------- --------- ------------------- ------------------- --------- ----------------------------------------------------------------
data resilver 2017-04-24 14:15:19
data resilver 2017-04-24 14:19:23 2017-04-25 08:26:10 completed
data defrag 2017-08-18 23:41:42 2017-08-19 00:53:13 completed
data balance 2017-08-19 00:00:25 2017-08-19 00:52:45 completed Done, had to relocate 7 out of 6374 chunks
data balance 2020-02-11 18:27:11 2020-02-11 18:33:42 completed Done, had to relocate 9 out of 7031 chunks
data resilver 2021-05-20 11:09:46 2021-05-20 21:06:45 completed
data resilver 2021-05-22 12:36:55 2021-05-23 04:34:46 completed
data resilver 2025-03-04 16:33:03 2025-03-05 18:04:47 completed
data resilver 2025-03-06 15:14:13 2025-03-07 10:06:56 completed
data resilver 2025-03-07 10:29:00 2025-03-08 03:56:04 completed
data resilver 2025-03-08 06:44:39 2025-03-08 15:47:04 completed
data resilver 2025-03-08 15:47:15 2025-03-09 13:41:31 completed