Troubleshooting guide

14 — Monthly maintenance tasks
Alcatel-Lucent 5620 Service Aware Manager 14-3
5620 SAM
System Administrator Guide
7 Use the mpstat command to review the activities performed by the CPU.
i Enter the following:
# mpstat time ↵
where time is the interval, in seconds, between CPU polls; a value between 10 and 60 is
recommended
ii Review the command output. Code 14-1 is an example of mpstat output;
Table 14-1 describes each output field.
Code 14-1: mpstat output example
CPU %usr %nice %sys %iowait %irq %soft %steal %guest %idle
all 0.25 0.00 0.17 0.00 0.00 0.00 0.00 0.00 99.58
Table 14-1 mpstat field descriptions
iii Record the data for future base measure comparisons of station
performance.
Look for differences in the output of the data for similar loads on each
station. Such differences indicate performance degradation.
iv Press CTRL-C to stop the command.
8 Use the iostat command to collect disk read and write data for determining
whether there is a disk bottleneck.
i Type:
iostat -x time ↵
where time is the time period, in seconds, during which you need to collect data.
Alcatel-Lucent recommends that you start with 2 s
Field Description (events per second unless noted)
CPU Processor number; the keyword all indicates that statistics are calculated
as averages among all processors
%usr Percentage of CPU utilization at the user application level
%nice Percentage of CPU utilization at the user level with nice priority
%sys Percentage of CPU utilization at the system level; does not include time
spent servicing hardware and software interrupts
%iowait Percentage of CPU idle time during which the system had an outstanding
disk I/O request
%irq Percentage of CPU time spent servicing hardware interrupts
%soft Percentage of CPU time spent servicing software interrupts
%steal Percentage of time spent in involuntary wait by the virtual CPU or CPUs
during hypervisor servicing of another virtual processor
%guest Percentage of CPU time spent running a virtual processor
%idle Percentage of CPU idle time without an outstanding disk I/O request
Release 13.0 R2 | May 2015 | 3HE 09815 AAAB TQZZA Edition 01