Nekonomicon - Diskperf: pread(); pwrite(): Invalid argument

pentium
Who joined Aug. 28, 2006, 5:29 p.m.
and authored 4228 notes

Wrote the following at Feb. 27, 2013, 1:03 p.m...

I'm trying to test performance to an external RAID enclosure for my O2 but all tests generate results and the following two errors:

Code:

  pwrite(): Invalid Argument
  
  pread(): Invalid Argument

...along with really bad fwd_wr and fwd_rd results.
Even testing with the basic diskperf /dev/dsk/dks1d1s7 causes the errors.

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foetz
Who joined April 14, 2003, 3:34 a.m.
and authored 4683 notes

Wrote the following at Feb. 28, 2013, midnight..

did you try diskperf on another disk?

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jan-jaap
Who joined June 17, 2004, 10:35 a.m.
and authored 3603 notes

Wrote the following at Feb. 28, 2013, 12:11 a.m...

I've seen this when running diskperf against raw disk devices (/dev/rdsk/...) rather than filesystems, if the raw device is "too big". Don't know exactly how big is "too big", IIRC 100GB worked and a couple of TB didn't.

I think you also get this for diskperf block sizes > maxdmasz chunk size (a kernel tunable). In this case diskperf starts fine, and at some point starts spitting out these errors.

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pentium
Who joined Aug. 28, 2006, 5:29 p.m.
and authored 4228 notes

Wrote the following at Feb. 28, 2013, 10:02 a.m...

I also tried it on my secondary internal drive which is only 36gb and it gave the errors as well

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Diskperf: pread(); pwrite(): Invalid argument