Wlm In Goal Mode; Wlm In Compatibility Mode; Hyper Parallel Access Volumes; Compatible Super Pav - HPE XP7 User Manual

WLM supports dynamic and static Parallel Access Volumes operations and manages workloads using
one of the following operational modes:
• Goal mode
For more information about this mode, see WLM in goal mode.
• Compatibility mode
For more information about this mode, see WLM in compatibility mode.

WLM in goal mode

The WLM must be in goal mode to support dynamic Parallel Access Volumes operations. The WLM is in
goal mode when the Dynamic alias management setting in the WLM Service Coefficient/Service
Definition Options screen is set to Yes. While in goal mode, the WLM manages the system to meet a
performance goal.

WLM in compatibility mode

The WLM must be in compatibility mode to support static Parallel Access Volumes operations. The WLM
is in compatibility mode when the Dynamic alias management setting in the WLM Service Coefficient/
Service Definition Options screen is set to No. While in compatibility mode, the WLM manages the
system according to parameters in IPS and ICS (IEAIPSxx and IEAICSxx parmlib members).

Hyper Parallel Access Volumes

You can use the Hyper Parallel Access Volumes feature to map an entire collection of alias devices to a
single Parallel Access Volumes 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. With the Hyper Parallel Access Volumes feature, a whole collection of alias devices can be
mapped to one base device in a CU when configuring the aliases using Remote Web Console in the
storage system.
You can specify the PAV feature (Parallel Access Volumes or Hyper Parallel Access Volumes) to use for
each host computer. Therefore, an alias device may accept I/O requests from Parallel Access Volumes or
Hyper Parallel Access Volumes.

Compatible Super PAV

The Hyper Parallel Access Volumes feature enables you to map alias devices to base devices only within
the same CU. If you want to map alias devices in a different CU, you must enable the Super PAV
mainframe system function on the storage system. When the Super PAV mainframe system function is
enabled, you can map an entire collection of alias devices to a single base device that is in a different CU.
You can specify the PAV feature (Parallel Access Volumes, Hyper Parallel Access Volumes, or
Compatible Super PAV) to use for each host computer. Therefore, an alias device might accept I/O
requests from Parallel Access Volumes, Hyper Parallel Access Volumes, and Compatible Super PAV.

I/O request workflow using Parallel Access Volumes

Multiple alias devices are assigned to a base device in a CU to enable the base device to handle multiple
I/O requests.
The existence of defined aliases devices allows the operating system to issue parallel I/Os by issuing I/O
to the base address and associated alias addresses for the base device. The maximum number of
WLM in goal mode 9