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Recently, we have encountered the problem of AIO in AIO 6.1and SF environment. Here are the general changes of AIO in MOS.

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AIO on AIX 6.1 (document ID 1328019.1)

Modification time: 2014-5-6

Type: HOWTO

In this Document

Goal

Fix

AIO on AIX 6.1 (document ID 1328019.1)

Modification time: 2014-5-6

Type: 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.

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.

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