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?
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.
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