RE: direct reads and writes on Solaris
- From: Mayen.Shah@xxxxxxxxxx
- To: ukja.dion@xxxxxxxxx
- Date: Fri, 25 Jan 2008 08:38:12 -0500
Very informative links.
Thank you Ukja
Mayen
"Ukja.dion" <ukja.dion@xxxxxxxxx>
Sent by: oracle-l-bounce@xxxxxxxxxxxxx
Jan 24 2008 06:55 PM
Please respond to
ukja.dion@xxxxxxxxx
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dannorris@xxxxxxxxxxxxx, "'Oracle L'" <oracle-l@xxxxxxxxxxxxx>
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Subject
RE: direct reads and writes on Solaris
Visit following URLs
http://www.solarisinternals.com/wiki/index.php/Direct_I/O
http://www.ixora.com.au/notes/filesystemio_options.htm
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of Dan Norris
Sent: Friday, January 25, 2008 7:14 AM
To: Oracle L
Subject: direct reads and writes on Solaris
Can someone help me interpret this set of data correctly?
The (vxfs) filesystem is mounted with these options:
/db51 on /dev/vx/dsk/oracledg/db18
read/write/setuid/mincache=direct/delaylog/largefiles/ioerror=mwdisable/dev=3ac36c1
This is 9.2.0.8 on Solaris 9 (V490, Generic_122300-07) with VxFS 4.1.
I have the following line in a truss of a dedicated server process:
open("/db51/oradata/tccrt1/member_questions_d01.dbf", O_RDWR|O_DSYNC) = 9
I also have the following settings in the DB:
NAME TYPE VALUE
------------------------------------ -----------
------------------------------
disk_asynch_io boolean TRUE
filesystemio_options string ASYNCH
The question(s):
I was expecting to see O_DIRECT in there somehow, but I'm thinking that
maybe that's just on Linux, not Solaris. I don't see O_DIRECT listed in
the open(2) manual page. I am also wondering if filesystemio_options needs
to be "setall" instead of the current setting of "ASYNCH" in order to
achieve directIO. Or, am I looking at the wrong thing to determine if
directIO is enabled?
Thanks in advance!
Dan
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