HP XP7 Storage - Manual (Page 7)

Compatibility mode
In compatibility mode, the number of alias devices assigned to each PAV base device remains the
same, even when the number of I/O requests to each device changes.
To use static PAV, set the WLM operational mode to compatibility mode. The WLM operational
mode must be set to compatibility mode to support static PAV 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 (page 22) .
The following figure shows an example of PAV 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.
Implementing a static PAV operation
Complete one of the following to implement a static PAV operation:
•
In the WLM Service Coefficient/Service Definition Options screen, for Dynamic alias
management, set it to No.
For more information about setting the WLM operational mode, (page 22) .
•
In the HCD file, set the WLMPAV parameter to No.
Hyper Parallel Access Volumes
You can use the HPAV feature to map an entire collection of alias devices to a single PAV base
device in a CU and to have all other base devices in the same CU share these aliases.
The HPAV feature does not require that you change the number of alias devices assigned to each
base device.
Workload Manager
The host computer uses WLM for PAV. It is a software component of the MVS/ESA® and z/OS®
operating systems.
WLM supports dynamic and static PAV operations and manages workloads on MVS systems using
one of the following operational modes:
•
Goal mode
For more information about this mode, see (page 6) .
•
Compatibility mode
For more information about this mode, see (page 7) .
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