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When I run "sar -d" on my RHEL 5.7 box, I get the response:

Requested activities not available in file

How do I configure sar to collect disk information?

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The 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 /etc/sysconfig/sysstat

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.

Edit your /etc/sysconfig/sysstat file to include a line like:

SADC_OPTIONS="-d"

then service sysstat restart

Give it some time for data to collect (at least 20 minutes), then sar -d should work.

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