September 2002
Intermediate to advanced
332 pages
11h 1m
English
Content preview from IBM eServer zSeries 900 Technical Guide
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Chapter 5. Sysplex functions 201
5.5.5 WLM and Channel Subsystem priority
WLM assigns the highest to lowest CSS priority as given in Table 5-3. It assigns 8 priority
levels.
Table 5-3 WLM assigned CSS I/O priorities
Work that is meeting its WLM target is assigned CSS priorities between F9 and FC,
depending on its execution profile. Work that has a light I/O usage has its CSS priority moved
upwards.
When an I/O operation is started by a CP on the CPC, it can be queued by the channel
subsystem for several reasons, including Switch port busy, Control unit busy, Device busy,
and All channel paths busy. Queued I/O requests are started or restarted ...
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