Larry Rosenman wrote:
On Tue, 13 Oct 2009, Ivan Voras wrote:
As for what data is needed, it depends on what you can get - from this
discussion thread it looks like it would be enough to verify that disk
IO doesn't leave VM processes waiting (i.e. that disk IO doesn't
interfere with CPU-bound or idle virtual machines). Though now when I
think of it - doesn't Linux ATA driver poll IO in some funky way,
expecting to get lower latency that way?
Have you looked at the information available via the performance tab(s)
in the
client pointing at the ESXi server?
The 20 second time resolution I get in performance charts isn't nearly
enough to diagnose something like this.
I've now been running iostat in the virtual console (not ssh) during
disk IO and I can't seem to get the characteristic "stutter" / pause
behaviour so I think that it's very likely there is too much going on in
the VM software to accurately conclude anything.
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