Re: CPU waiting for I/O in Exadata Database Node

From: Stefan Koehler <>
Date: Wed, 23 May 2018 12:35:05 +0200 (CEST)
Message-ID: <>

Hello Cheng,
please be also aware that iowait might not represent what you think.

Best Regards
Stefan Koehler

Independent Oracle performance consultant and researcher Website:
Twitter: _at_OracleSK

> Ls Cheng <> hat am 22. Mai 2018 um 19:28 geschrieben:
> Hi
> I am observing quite high CPU waiting for I/O in Exadata Database Nodes (vmstat output). but from iostat there no waits at all (which is obvious since heavy I/O is done through infiniband).
> Anyone know what can be the CPU waiting for?
> Thanks

Received on Wed May 23 2018 - 12:35:05 CEST

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