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RE: Is async IO configured on HP-UX?

From: Jesse, Rich <Rich.Jesse_at_qtiworld.com>
Date: Thu, 13 Mar 2003 14:04:22 -0800
Message-ID: <F001.005699E5.20030313140422@fatcity.com>


On HP, I believe that async I/O is only supported for raw filesystems. See MetaLink for more details.

Rich

Rich Jesse                        System/Database Administrator
rich.jesse_at_qtiworld.com           Quad/Tech International, Sussex, WI USA


-----Original Message-----

Sent: Thursday, March 13, 2003 1:36 PM
To: Multiple recipients of list ORACLE-L

The HP-UX syscall tracing tool is called 'tusc', and it's supposed to be available by visiting ftp://ftp.cup.hp.com/dist/networking/misc/.

Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com

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-----Original Message-----

Sent: Thursday, March 13, 2003 12:36 PM
To: Multiple recipients of list ORACLE-L

Ethan -

it has been a while and we don't have an HP-UX box here, but if memory serves the missing /dev/async is a dead giveaway that your not using async io.

to use async io on HP-UX we had to install something called the asyncdisk driver in SAM and then use mknod to create /dev/async directory. could the asyncdisk driver already be installed and you just need the directory? SAM should tell you. if not i think it means a kernel rebuild.

-----Original Message-----

Sent: Thursday, March 13, 2003 10:44 AM
To: Multiple recipients of list ORACLE-L

/dev does not have an async directory, async IO is turned on in the database, how do I determine if async IO is activated on the OS side of the house? Is the missing async directory an indicator?

Also, is the database smart enough to figure out that the OS is not using async and make correct call or will I get a timeout on async call then perform standard write?

Thanks,
Ethan

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Author: Jesse, Rich
  INET: Rich.Jesse_at_qtiworld.com

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Received on Thu Mar 13 2003 - 16:04:22 CST

Original text of this message

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