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Comment on Mirror seeing half the write IOPS on one disk than the other, is this normal?

Interesting. SMART looks pristine on both drives. Brand new drives - Exos X22. Doesn’t mean there isn’t an impending problem of course.

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Shadow@lemmy.ca ⁨2⁩ ⁨months⁩ ago

You could just swap the two disks and see if it follows the drive or the link.

If the drive, rma it. I don’t put a lot of faith in smart data.

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lightrush@lemmy.ca ⁨2⁩ ⁨months⁩ ago

Turns out the on-CPU SATA controller isn’t available when the NVMe slot is used. 🫢 Swapped SATA ports, no diff. Put the low IOPS disk in a good USB 3 enclosure, hooked to an on-CPU USB controller. Now things are flipped:

                                        capacity     operations     bandwidth 
pool                                  alloc   free   read  write   read  write
------------------------------------  -----  -----  -----  -----  -----  -----
storage-volume-backup                 12.6T  3.74T      0    563      0   293M
  mirror-0                            12.6T  3.74T      0    563      0   293M
    wwn-0x5000c500e8736faf                -      -      0    406      0   146M
    wwn-0x5000c500e8737337                -      -      0    156      0   146M

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