To mount procfs you need to do following.
mount -t procfs proc /proc
It is necessary to run command like truss on dump(core) file.
To check network status
nload -u m <interface>
To check system statistics.
To Monitor Disk activity there is command called gstat.
there is three switches. '-c' '-d' & '-I'
-c shows consumers of geom
-d shows delete operations.
-I can define interval of refresh.
gstat -I 1 -c
Most is it is usefull when you can not use crontab command.
Cron file located @