diskinfo -wS truncates [prohibiting slog testing funtime]

svtkobra7

Active Member
Jan 2, 2017
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Can a kind soul advise why when running diskinfo -wS /dev/nvdx ...
It truncates output @ 256 kbytes: diskinfo: AIO write submit error: Operation not supported
And doesn't continue to 8192 kbytes as per usual?


I have a smorgasboard of different M.2 drives I wanted to bench (this being one quick test I wanted to perform):
  • 2x Samsung SSD 970 EVO Plus 500GB
  • 2x WD SN750 500 GB
  • 2x INTEL SSDPEL1D380GA (905P 380GB)
  • 2x P4801x 100GB
Can't wait to mirror 2x INTEL SSDPEL1D380GA (905P 380GB) and throw a P4801x behind it. Should be FUN (for me at least, many here would yawn at such slow speeds).

Code:
    diskinfo -wS /dev/nvd3
    /dev/nvd3
    512 # sectorsize
    ...
    Synchronous random writes:
    0.5 kbytes: 42.6 usec/IO = 11.5 Mbytes/s
    1 kbytes: 44.3 usec/IO = 22.0 Mbytes/s
    ....
    128 kbytes: 127.1 usec/IO = 983.6 Mbytes/s
    256 kbytes: diskinfo: AIO write submit error: Operation not supported
[dual post in the interest of transparency on ix too ... surprised it wasn't snagged already - and this is killing me!!!]