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

submitted 3 weeks ago* (last edited 3 weeks ago) by lightrush@lemmy.ca to c/selfhosted@lemmy.world

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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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[–] Decronym@lemmy.decronym.xyz -1 points 3 weeks ago* (last edited 2 weeks ago)

Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I've seen in this thread:

Fewer Letters	More Letters
NVMe	Non-Volatile Memory Express interface for mass storage
PCIe	Peripheral Component Interconnect Express
PSU	Power Supply Unit
SATA	Serial AT Attachment interface for mass storage
SSD	Solid State Drive mass storage
ZFS	Solaris/Linux filesystem focusing on data integrity

6 acronyms in this thread; the most compressed thread commented on today has 6 acronyms.

[Thread #958 for this sub, first seen 8th Sep 2024, 16:15] [FAQ] [Full list] [Contact] [Source code]