These are crons to accumulate system performance statistics into sadd files (sa1) and summarises system performance statistics into sardd files (sa2). The output files are usually in /usr/adm/sa or /var/adm/sa (depends on the system).
The crons are explained at length in "man sa1" .
(cross post)
I don't have "-S DISK1" parameter on my system. See "man sa1" for your system.
NAME
sa1 - Collect and store binary data in the system activity daily data file.
SYNOPSIS
/usr/lib/sa/sa1 [ interval count ]
DESCRIPTION
The sa1 command is a shell procedure variant of the sadc command and handles all of the flags and parameters of that command. The sa1
command collects and store binary data in the /var/log/sa/sadd file, where the dd parameter indicates the current day. The interval
and count parameters specify that the record should be written count times at interval seconds. If you do not specify these parame-
ters, a single record is written.
The sa1 command is designed to be started automatically by the cron command.