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Operating Systems AIX What happened if CPU utilization is near to 100 % in AIX 6.1? Post 302823841 by Just Ice on Thursday 20th of June 2013 01:20:08 AM
Old 06-20-2013
if peak utilization on 1 box had already gone up as high as 65%, your backup setup will only be fine while total utilization from both boxes loads on 1 server is less than 95%* ... once your total utilization reaches 100%, your users will definitely see performance hits ...

my quick rule of thumb here -- if i am not allowed to test 1 server to host both servers' daily loads and i do not have access to metrics -- would be to see what is the maximum total utilization of each server and add them together ... if below 80%, the "backup" server should be able to last long enough for the downed server to be fully recovered without the users seeing any performance issues ... if above 80%, there is a higher risk that users will see the performance hits long enough to complain that i do not know what i am doing while i am actually doing everything to recover the downed server ...

but just like everything we do, always take into account your computing environment and your users' job functions ... a performance hit on a development server is not as critical as a performance hit on an application server handling billions of dollars worth of financial transactions a day ... if systems are hyper-critical, always have a 3rd box handy and ready to go ...

*the actual threshold may be higher but i try to err on the side of caution ...
 

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utild(1M)																 utild(1M)

NAME
utild - System-utilization collection daemon SYNOPSIS
DESCRIPTION
is a lightweight daemon that records system-utilization data on a 5-minute interval. System-utilization data includes CPU, memory, disk, and network data. is installed as part of the software, which also contains a WBEM provider that is the interface to the data collected by stores up to 30 days worth of utilization data and consumes minimal system resources. The total disk space consumed by these data files should not exceed 20 megabytes in the default installation. is respawned if it is killed, due to the following entry in /etc/inittab: WARNINGS
Removing the removes any historical data that has been collected by as well as prevents and from functioning properly. To disable the software can be removed with the following command (see swremove(1M)): FILES
WBEM mof files documenting the class schema for retrieving utilization data collected by Data and configuration files. These files contain the definitions of all workloads created on the system, and up to 30 days of collected utilization data. To ensure continuity of data collection and prevent loss of workload definitions, HP recommends including this directory in daily backups. AUTHORS
was developed by the Hewlett-Packard Company. SEE ALSO
cimserver(1M) utild(1M)
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