--On 20 September 2017 11:15 -0700 "Rodney W. Grimes"
<freebsd-...@pdx.rh.cn85.dnsmgr.net> wrote:
As you found one of these let me point out the pair of them:
kern.cam.ada.default_timeout: 30
kern.cam.ada.retry_count: 4
Adjusting these doesn't seem to make any difference at all.
All the VM's (the control one, running defaults) - and the 3 others (one
running longer timeouts, one running more retries - and one running both
longer timeouts and retries) - all start throwing I/O errors on the console
at the same time (e.g. regardless if the timeout is set to default 30
seconds, or extended out to 120) - I/O errors pop up at the same time.
It looks like they're either ignored, or 'not applicable' for this scenario.
Of particular concern is - if I adjust the 'timeout' value from 30 to 100
seconds, and 'time' how long the first I/O error takes to appear on the
console, it's still ~30 seconds.
I'm going to re-setup the test VM's - with a 'stable' boot disk (that won't
go away during the switch) to give me something to log to - I should be
able to work out the timings involved then, to see if the first I/O error
really does surface after 30 seconds, or not.
If the timeout is set to, say 100 seconds - I shouldn't see any console
errors until then, should I? - unless some other part of the storage stack
is still timing out first at 30 seconds?
-Karl
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