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Mirror seeing half the write IOPS on one disk than the other, is this normal? (discourse.practicalzfs.com)

submitted 2 months ago* (last edited 2 months ago) by lightrush@lemmy.ca to c/selfhosted@lemmy.world

15 comments fedilink hide all child comments

I'm syncoiding from my normal RAIDz2 to a backup mirror made of 2 disks. I looked at zpool iostat and I noticed that one of the disks consistently shows less than half the write IOPS of the other:

                                        capacity     operations     bandwidth 
pool                                  alloc   free   read  write   read  write
------------------------------------  -----  -----  -----  -----  -----  -----
storage-volume-backup                 5.03T  11.3T      0    867      0   330M
  mirror-0                            5.03T  11.3T      0    867      0   330M
    wwn-0x5000c500e8736faf                -      -      0    212      0   164M
    wwn-0x5000c500e8737337                -      -      0    654      0   165M

This is also evident in iostat:

     f/s f_await  aqu-sz  %util Device
    0.00    0.00    3.48  46.2% sda
    0.00    0.00    8.10  99.7% sdb

The difference is also evident in the temperatures of the disks. The busier disk is 4 degrees warmer than the other. The disks are identical on paper and bought at the same time.

Is this behaviour expected?

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[–] lightrush@lemmy.ca 1 points 1 month ago (1 children)

I think the board has reached the end of the road. 😅

[–] themoonisacheese@sh.itjust.works 1 points 3 weeks ago

Sorry I 'ever saw this, that sucks.

Turns out mine was broken too. I put the CPU in my gaming rig and it worked fine, so I bought a new motherboard and the problem is gone.