Thanks the following people for replying .. (and others who reply but I
haven't received yet..) 
From: 	Frank Lei[SMTP:frank_lei@jpmorgan.com]
From: 	Rich Snyder[SMTP:rsnyder@eos.hitc.com]
From: 	Harald van Breederode[SMTP:hbreeder@nl.oracle.com]
From: 	Matthew Stier[SMTP:mstier@hotmail.com]
------------------------------------------------------------------------
----------------
The answer is:
su as sys and uncomment the 3 lines in crontab.
Check out man sa1 which will tell you to modify /etc/init.d/perf.
vobber% crontab -l
#ident  "@(#)sys        1.5     92/07/14 SMI"   /* SVr4.0 1.2   */
#
# The sys crontab should be used to do performance collection. See cron
# and performance manual pages for details on startup.
#
# 0 * * * 0-6 /usr/lib/sa/sa1
# 20,40 8-17 * * 1-5 /usr/lib/sa/sa1
# 5 18 * * 1-5 /usr/lib/sa/sa2 -s 8:00 -e 18:01 -i 1200 -A    
-Bruce
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