RE: FILESYSTEMIO_OPTIONS (AIX 5.2 ML06, 9.2.0.5, JFS2)
- From: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>
- To: <stuart.clowes@xxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 16 Jun 2006 11:24:04 -0700
You can see CIO in the FILE-FLAG column if you run lsof +fg, e.g.:
tarunx01:/home/abielewi:# /p570build/LSOF/lsof-4.76/usr/local/bin/lsof
+fg /baanprd/oradat
COMMAND PID USER FD TYPE FILE-FLAG DEVICE
SIZE/OFF NODE NAME
oracle 434222 oracle 16u VREG R,W,CIO,DSYN,LG;CX 39,1
6701056 866 /baanprd/oradat (/dev/bprdoradat)
oracle 434222 oracle 17u VREG R,W,CIO,DSYN,LG;CX 39,1
6701056 867 /baanprd/oradat (/dev/bprdoradat)
oracle 442384 oracle 15u VREG R,W,CIO,DSYN,LG;CX 39,1
1174413312 875 /baanprd/oradat (/dev/bprdoradat)
oracle 442384 oracle 16u VREG R,W,CIO,DSYN,LG;CX 39,1
734011392 877 /baanprd/oradat (/dev/bprdoradat)
oracle 450814 oracle 15u VREG R,W,CIO,DSYN,LG;CX 39,1
1174413312 875 /baanprd/oradat (/dev/bprdoradat)
oracle 450814 oracle 16u VREG R,W,CIO,DSYN,LG;CX 39,1
1814044672 876 /baanprd/oradat (/dev/bprdoradat)
oracle 487666 oracle 15u VREG R,W,CIO,DSYN,LG;CX 39,1
1174413312 875 /baanprd/oradat (/dev/bprdoradat
You should also see O_CIO in your file open calls if you run truss,
e.g.:
open("/opt/oracle/rcat/oradat/redo01.log",
O_RDWR|O_CIO|O_DSYNC|O_LARGEFILE) = 18
HTH,
Brandon
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Stuart Clowes
Sent: Thursday, June 15, 2006 9:37 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: FILESYSTEMIO_OPTIONS (AIX 5.2 ML06, 9.2.0.5, JFS2)
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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