System activity data can be accessed at the special request of a user (see sar(1) ) and automatically, on a routine basis, as described here. The operating system contains several counters that are incremented as various system actions occur. These include counters for CPU utilization, buffer usage, disk and tape I/O activity, TTY device activity, switching and system-call activity, file-access, queue activity, inter-process communications, and paging. For more general system statistics, use iostat (1M) , sar(1) , or vmstat(1M) .
See Solaris Transition Guide for device naming conventions for disks.
sadc and two shell procedures, sa1 and sa2 , are used to sample, save, and process this data.
sadc , the data collector, samples system data n times, with an interval of t seconds between samples, and writes in binary format to ofile or to standard output. The sampling interval t should be greater than 5 seconds; otherwise, the activity of sadc itself may affect the sample. If t and n are omitted, a special record is written. This facility can be used at system boot time, when booting to a multi-user state, to mark the time at which the counters restart from zero. For example, when accounting is enabled, the /etc/init.d/perf file writes the restart mark to the daily data file using the command entry:
su sys -c "/usr/lib/sa/sadc /var/adm/sa/sa`date +%d`"
The shell script sa1 , a variant of sadc , is used to collect and store data in the binary file /var/adm/sa/sa dd, where dd is the current day. The arguments t and n cause records to be written n times at an interval of t seconds, or once if omitted. The following entries in /var/spool/cron/crontabs/sys will produce records every 20 minutes during working hours and hourly otherwise:
0 * * * 0-6 /usr/lib/sa/sa1 20,40 8-17 * * 1-5 /usr/lib/sa/sa1
See crontab(1) for details.
The shell script sa2 , a variant of sar , writes a daily report in the file /var/adm/sa/sar dd. See the OPTIONS section in sar(1) for an explanation of the various options. The following entry in /var/spool/cron/crontabs/sys will report important activities hourly during the working day:
5 18 * * 1-5 /usr/lib/sa/sa2 -s 8:00 -e 18:01 -i 1200 -A
daily data file
daily report file
See attributes(5) for descriptions of the following attributes:
|ATTRIBUTE TYPE||ATTRIBUTE VALUE|