Hi All,
Been reading man pages, docs, and Googling, and haven’t found a definitive
answer to this question, so I knew exactly where to turn… ;-)
I’m dealing with some slow I/O’s to certain storage arrays in our environments
… like really, really slow I/O’s … here’s just one example from one of my NSD
servers of a 10 second I/O:
08:49:34.943186 W data 30:41615622144 2048 10115.192 srv dm-92
<client IP redacted>
So here’s my question … when mmdiag —iohist tells me that that I/O took
slightly over 10 seconds, is that:
1. The time from when the NSD server received the I/O request from the client
until it shipped the data back onto the wire towards the client?
2. The time from when the client issued the I/O request until it received the
data back from the NSD server?
3. Something else?
I’m thinking it’s #1, but want to confirm. Which one it is has very obvious
implications for our troubleshooting steps. Thanks in advance…
Kevin
—
Kevin Buterbaugh - Senior System Administrator
Vanderbilt University - Advanced Computing Center for Research and Education
kevin.buterba...@vanderbilt.edu<mailto:kevin.buterba...@vanderbilt.edu> -
(615)875-9633
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