FILESYSTEMIO_OPTIONS (AIX 5.2 ML06, 9.2.0.5, JFS2)
- From: "Stuart Clowes" <stuart.clowes@xxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Thu, 15 Jun 2006 17:36:45 +0100
How can I confirm that FILESYSTEMIO_OPTIONS is having an effect?
I an on AIX5.2 ML06;
JFS2 filesystems mounted without dio or cio; and Oracle 9.2.0.5. AIO is
enabled.
# lsattr -El aio0
autoconfig available STATE to be configured at system restart True
fastpath enable State of fast path True
kprocprio 39 Server PRIORITY True
maxreqs 16384 Maximum number of REQUESTS True
maxservers 20 MAXIMUM number of servers per cpu True
minservers 10 MINIMUM number of servers True
I have trussed DBW0 (and LGWR).
With DISK_ASYNCH_IO = FALSE and FILESYSTEMIO_OPTIONS=SETALL, I see kpwrite
calls
With DISK_ASYNCH_IO = FALSE and FILESYSTEMIO_OPTIONS=ASYNCH, I see kpwrite
calls.
With DISK_ASYNCH_IO = FALSE and FILESYSTEMIO_OPTIONS=NONE, I see kpwrite
calls
With DISK_ASYNCH_IO = TRUE and FILESYSTEMIO_OPTIONS=SETALL, I see listio64
and aio_nwait calls
With DISK_ASYNCH_IO = TRUE and FILESYSTEMIO_OPTIONS=ASYNCH, I see listio64
and aio_nwait calls.
With DISK_ASYNCH_IO = TRUE and FILESYSTEMIO_OPTIONS=NONE, I see listio64 and
aio_nwait calls.
I expected to be able to 'turn off' asynch io if DISK_ASYNCH_IO = TRUE and
FILESYSTEMIO_OPTIONS=NONE. What have I missed?
This is just a preliminary up to my main question, which is validating that
concurrent I/O is also enabled as expected........
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