204IBM TotalStorage DS6000 Series: Performance Monitoring and Tuning
Discussions of disk, logical volume, and file system performance sometimes lead to the
conclusion that the more drives you have on your system, the better the disk I/O performance.
This is not always true since there is a limit to the amount of data that can be handled by the
adapter performing the I/O.
7.3.2 SAR
System Activity Report (SAR) is a tool that reports the contents of certain cumulative activity
counters within the UNIX operating system. SAR has numerous options, providing paging,
TTY, CPU busy, and many other statistics. Used with the appropriate command flag (-u ...
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