NAME

na.iostat2 - Input/Output statistics

DESCRIPTION

na.iostat2 returns information about the CPU, disk, and TTY activity on the host where the agent is running.

A reporting interval is specified by the management application. If a reporting interval is not specified, the agent will send a report every 30 seconds.

ATTRIBUTES

na.iostat2 has one attribute table, disk, and two attribute groups, cpu and tty.

The disk table reports statistics about the system's disks. The key is the name. The attributes in the table are:

name - name of the disk (string)

reads - number of reads per second (float)

writes - number of writes per second (float)

kreads - number of Kbytes read per second (float)

kwrites - number of Kbytes written per second (float)

svcwait - average number of transactions waiting for service (float)

acttrans - average number of transactions actively being serviced (float)

svctime - average service time in milliseconds (float)

%wait - percent of time there are transactions waiting for service (float)

%busy - percent of time the disk is busy (float)

The cpu group reports statistics about the CPU utilization.

user - number of ticks spent running user jobs since boot (counter)

nice - number of clock ticks spent in nice mode since boot (counter)

sys - number of clock ticks spent in system mode since boot (counter)

idle - number of clock ticks spent idle since boot (counter)

The tty group reports statistics about tty input and output.

tty_in - number of characters read since boot (counter)

tty_out - number of characters written since boot (counter)

OPTIONS

None.

ERRORS

can't read kernel memory

The agent uid does not have permission to read kernel memory, /dev/kmem. Run the agent as root (default case if agent started by inetd (1M) ), or give read permission to the uid the agent is running under.

NOTES

Milliseconds per average seek is an approximation based on the disk (not the controller) transfer rate. Therefore, the seek time will be overestimated in systems with slower controllers.