sysstat service which runs the
sa binaries is not collecting disk statistics in
/var/log/sa files. This is turned off by default to prevent the logs from growing large on systems with hundreds or thousands of block devices.
When you run
sar to report disk statistics, the Requested activities not available in file message is telling you that
sa hasn't been collecting disk statistics, so
sar can't display anything.
You can add config parameters with the
SADC_OPTIONS value in
The ability to do this was added in Bug 598794 so you'll need to be running
sysstat-7.0.2-11.el5 or later.
/etc/sysconfig/sysstat file to include a line like:
service sysstat restart
Give it some time for data to collect (at least 20 minutes), then
sar -d should work.