AIO on AIX 6.1 (文档 ID 1328019.1)

AIO on AIX 6.1 (文档 ID 1328019.1)

 

修改时间:2014-5-6

类型:HOWTO

 

In this Document

 

Goal

Fix

References

 

APPLIES TO:

oracle Server - Enterprise Edition - Version 10.2.0.4 to 11.2.0.2.0 [Release 10.2 to 11.2]

IBM AIX on POWER Systems (64-bit)

GOAL

Enabling or checking AIO on AIX 6.1 Operating System.

FIX

 

Customers do not need to enable AIO subsystem on AIX 6.1 as it's a default  option. AIO subsystems are handled thru AIX kernel extensions and they are  loaded by default. They are also automatically started when an application  initiates an AIO requests.

 

Two new parameters (aio_active and posix_aio_active; ioo -a | grep aio) have  been added on AIX 6.1, but they can only be changed by AIX. The value is set  to 1 only when AIX kernel extensions are used and pinned.

 

So, the bottom line is that you don't need to do any checking on AIX 6.1. Another  way of checking if AIO subsystems are loaded is to verify whether kernel extensions are loaded or  not. You can do that by doing "genkex | grep aio".

 

As an example - the following command may show:

 

/usr/sbin/ioo -a | grep aio 

aio_active = 1

aio_maxreqs = 8192

aio_maxservers = 40

aio_minservers = 20

aio_server_inactivity = 300

posix_aio_active = 1

posix_aio_maxreqs = 65536

posix_aio_maxservers = 30

posix_aio_minservers = 3

posix_aio_server_inactivity = 300

 

NOTE:  Please note that Oracle is not recommending changes to these parameters as they are dynamically tuned by AIX 6.1 and values of these parameters get changed according to the server utilization.  AIX will adjust them accordingly.