How To
Summary
How to check, enable and disable sys0 iostat attribute
Steps
What is sys0 iostat?
sys0 iostat Is an AIX attribute that is enabled by default.
The main role of this attribute is to update disk usage data (read/write and statistics) since boot time.
For 99% of our customers, that is not needed and simply takes extra RAM and processing time.
So we recommend it to be set to "false" in order to reduce the RAM and CPU usage and avoid unneeded processing overheads.
Checking the status of sys0 iostat:
To display the current settings, use the following list attribute command:
$ lsattr -El sys0 -a iostat
$ lsattr -El sys0 -a iostat
Output examples:
In case iostat is disabled. The output is as follows:
iostat false Continuously maintain DISK I/O history True
In case iostat is enabled. The output is as follows:
iostat true Continuously maintain DISK I/O history True
Enabling and disabling sys0 iostat:
To disable sys0 iostat, the following command can be used:
$chdev -l sys0 -a iostat=false
To enable sys0 iostat, the following command can be used:
$chdev -l sys0 -a iostat=true
It is an immediate change and survives system reboot (No reboot is needed).
Cheers!
A.Darwish
Document Location
Worldwide
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Document Information
Modified date:
15 September 2021
UID
ibm16257535