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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 [email protected] to c/[email protected]

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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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[–] [email protected] 2 points 2 months ago (1 children)

Oh wow congrats, I'm currently in the struggle of stretching an ab350m to accept a 4600G and failing.

You're right, you should hit PCIe 3 speeds and it's weird, but the fact that the drives swap speeds depending on how they're plugged in points to either drivers or the chipset.

[–] [email protected] 1 points 2 months ago* (last edited 2 months ago) (1 children)

On paper it should support it. I'm assuming it's the ASRock AB350M. With a certain BIOS version of course. What's wrong with it?

[–] [email protected] 2 points 2 months ago (2 children)

It's a gigabyte ab350m gaming-3 rev 1.0. it boots grub fine but then crashes right after displaying "loading Linux 6.x", CPU led flashes then dram led stays on, I have to turn it off with the PSU switch.

Either it's a rev 1.0 bug which is a thing on those motherboards, or the CPU (or igpu) is defective.

https://superuser.com/questions/1854228/proxmox-doesnt-boot-after-cpu-change

I'm currently waiting on support from both the seller and gigabyte but I don't expect anything out of it, though I'm still yet to test it in a different motherboard.

[–] [email protected] 1 points 2 months ago (1 children)

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

[–] [email protected] 1 points 1 month 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.

[–] [email protected] 1 points 2 months ago* (last edited 2 months ago)

Iiinteresting. I'm on the larger AB350-Gaming 3 and it's got REV: 1.0 printed on it. No problems with the 5950X so far. 🤐 Either sheer luck or there could have been updated units before they officially changed the rev marking.