HP StorageWorks XP Remote Web Console Software - Manual (Page 11)

WLM Host Software Definitions for Dynamic Alias Management
The Workload Manager (WLM) software component of the MVS/ESA, z/OS, or OS/390 operating
system enables the host to interface with the Compatible PAV functionality of the storage system.
WLM compatibility mode provides static Compatible PAV functionality, and WLM goal mode
provides dynamic Compatible PAV functionality. WLM must be in GOAL mode to support Dynamic
Alias Management Compatible PAV functionality.
Support for Dynamic Alias Management by the Workload Manager (WLM) is dependent on the
following three parameter settings:
•
WLM Goal Mode setting
•
WLM Dynamic Alias Management setting in the Service Coefficients/Service Definitions
window (see
“WLM Service Coefficient/Service Definition Options Dialog Box” (page 64) )
•
WLMPAV setting of each base device as defined in the Define Device Parameters / Features
HCD definition window (see
“HCD Device Parameters” (page 59) )
For further information on configuring RAID storage systems and disk devices for zSeries and
S/390 PAV operations, see the following and other IBM documents:
•
z/OS DFSMS Software Support for IBM Enterprise Storage Server (SC26-7399-00)
•
IBM Enterprise Storage Server Performance Monitoring and Tuning (SG24-5656)
•
System/390 Command Reference 2105 Models E10, E20, F10, F20 (SC26-7298)
•
OS/390 MVS Planning: Workload Management (GC28-1761)
Enabling XP Compatible Hyper PAV
Enable XP Compatible Hyper PAV using the Remote Web Console computer.
Static and Dynamic Compatible PAV Operations
Static or dynamic Compatible PAV operation is determined by the combination of the following
parameter settings:
•
The WLMPAV=xxx parameter setting for each device defined to the z/OS and OS/390 host
via HCD. The default setting of this parameter is WLMPAV=YES for 3390B or 3390A, 3380B
or 3380A devices defined via HCD.
•
The Dynamic Alias Support parameter setting for WLM.
•
Static Compatible PAV is implemented when the WLM feature for Dynamic Alias Support is
set to NO and the appropriate aliases are assigned to the base devices using the Compatible
PAV Remote Web Console software. The setting of the WLMPAV=xxx parameter defined for
each 3390B or 3390A, 3380B or 3380A device is ignored. In addition, the I/O Priority
Management setting for WLM is ignored (see
Table 1 (page 12) ).
•
Dynamic Compatible PAV is implemented when Dynamic Alias Support is set to YES and the
appropriate aliases are assigned to the base devices using the Compatible PAV Remote Web
Console software. The setting of the WLMPAV=xxx parameter defined for each 3390B or
3390A, 3380B or 3380A device must be set to YES if WLM is to manage the alias device
address assignments. In addition, the I/O Priority Management setting for WLM determines
the dynamic alias algorithm to be used for meeting the Performance Index of the workloads
under the control of WLM using the Compatible PAV feature (see
Table 1 (page 12) ).
When Dynamic Alias Support is enabled and the start relation between A & B are defined,
via remote web console, the alias-to-base assignments are managed by the WLM component
of the z/OS and OS/390 system as needed in response to changes in I/O activity.
Static and Dynamic Compatible PAV Operations 11