Parallel Access Volumes In Static Mode; Workload Manager - HPE XP7 User Manual

Parallel Access Volumes in static mode

In Parallel Access Volumes static mode, the number of alias devices assigned to each Parallel Access
Volumes base device remains the same, even when the number of I/O requests to each device changes.
To use static Parallel Access Volumes, set the WLM operational mode to compatibility mode. The WLM
operational mode must be set to compatibility mode to support static Parallel Access Volumes operations.
While in compatibility mode, WLM manages the system according to parameters in IPS and ICS
(IEAIPSxx and IEAICSxx parmlib members).
For more information about setting the WLM operational mode, see Setting the WLM operational mode.
The following figure shows an example of Parallel Access Volumes base devices assigned to alias
devices.
In this example, the x10, x11 and x12 base devices were originally assigned two alias devices each. As
I/O requests converge on the base device x10 (indicated by the large arrow), the number of alias devices
for each base device does not change.

Workload Manager

The host computer uses WLM for Parallel Access Volumes. It is a software component of the IBM
MVS/ESA and z/OS operating systems.
8 Parallel Access Volumes in static mode