2. PERFORMANCE REPORTING ANALYSIS › 2.4 I/O Configuration Analysis › 2.4.5 DASD Skew Analysis Inquiry

2.4.5 DASD Skew Analysis Inquiry

Prior to the introduction of controllers with RPS avoidance,
such as EMC and 3990-6 controllers, a condition existed
called DASD skew.  DASD skew occurs when one or two of the
devices on a string of DASD are particularly busy and are
adversely affecting the performance of the remainder of the
devices on the string.

DASD skew is discussed in the technique tutorial (Section
2.4.5.2). The DASD Skew Analysis Report allows you to
identify strings that have significant balance problems on
their devices.

This section discusses the following topics:

    1 - Standard Output
    2 - Technique Tutorial
    3 - Case Study
    4 - Component Operation