10-24-2008
Did you add this cron job yourself, or did you just use the one that was installed by sysstat (usually in /etc/cron.d/sysstat)? Maybe there's another job running that's recording data every 10 minutes.
You shouldn't see 3 entries every x minutes anyway... the 3 just means that it should write 3 entries 20 minutes apart. i.e. first cron job of the day runs at 08:00, collects data for 1200 seconds, writes an entry, collects data for 1200 seconds, writes second entry, collects data for 1200 seconds, writes third entry and exits... at which time it would be 09:00 when the next cron job kicks in and repeats the exercise.
So the only mystery here is why it's recording at 10 minute intervals... unless sar insists on reporting in 10 minute intervals by default, but I didn't think it could do that unless the data was actually recorded with that frequency.
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sa1(8) BSD System Manager's Manual sa1(8)
NAME
sa1 -- Generate a system activity daily data file.
SYNOPSIS
/usr/lib/sa/sa1 [t n]
DESCRIPTION
The sa1 command is a shell script used to invoke the system activity data collector, sadc. The binary sample data is collected at intervals
t seconds apart, in a loop n times. The binary sample data is written to the standard daily data file, /var/log/sa/sadd where the dd repre-
sents the current day of the month.
sa1 is intended to be started by cron.
EXAMPLE CRON ENTRY
# Starting at 8am collect system activity records
# every 20 minutes for 12 hours
# 20 minutes = 1200 seconds
# 12 hours with 3 samples each hour = 36 loops
0 8 * * 1-5 /usr/lib/sa/sa1 1200 36
# After the 12 hour period,
# collect a system activity report
30 20 * * 1-5 /usr/lib/sa/sa2 -A
FILES
/var/log/sa/sadd Default daily activity file that holds the binary sampling data. dd are digits that represent the day of the month.
SEE ALSO
crontab(1), fs_usage(1), netstat(1), sar(1), sc_usage(1), top(1), vm_stat(1), crontab(5), iostat(8), sa2(8), sadc(8)
Mac OS X Jul 25 2003 Mac OS X