HP StorageWorks XP Remote Web Console Software - Manual (Page 15)

HPAV for z/OS user guide for the XP128/XP1024/XP12000/XP10000 15
2 Overview of Compatible PAV Operations
Components
The components that are involved in Compatible PAV operations are:
• Base devices and alias devices on the disk array (see ” Base Devices and Alias Devices ” on page 15)
• Controller emulation type for the disk array (see ” Controller Emulation Type ” on page 16
• Compatible PAV software enabled on the disk array through the Command View XP management
station or XP Remote Web Console (see Managing license keys and/or Command View-based
Compatible PAV in the HP StorageWorks Command View XP User Guide for XP Disk Arrays or the
HP StorageWorks XP Remote Web Console User Guide for the specific disk array)
• Hardware Configuration Definition (HCD) definitions for the disk array (see ” HCD Definitions for the
XP1024/XP128/XP12000/XP10000 Compatible PAV Devices ” on page 16)
• WLM host software definitions for dynamic alias management (see ” WLM Host Software Definitions for
Dynamic Alias Management ” on page 16)
• Setting of enabling Compatible Hyper PAV (see ” WLMPAV setting of each base device as defined in
the “Define Device Parameters / Features” HCD definition window. ” on page 17
Base Devices and Alias Devices
The XP1024/XP128/XP12000/XP10000 supports a maximum of 65,280 logical devices (LDEVs), up to
256 LDEVs per logical control unit (CU) image and up to 255 CU images. The number of LDEVs per parity
group depends on the hard disk drive (HDD) type, RAID level, and device emulation type (for example,
3390-3R) of the parity group. Each LDEV is uniquely identified by its LDEV ID, which consists of the logical
CU image number (0, 1, 2...FE) and device number (00-FF hexadecimal) (for example, x0:0F = device 0F
in CU image 0).
LDEVs that are formatted as zSeries and OS/390® devices (for example, 3390 or 3380) are called
logical volume images (LVIs) or volumes. LDEVs formatted as open system devices (for example, OPEN-3 or
OPEN-9) are called logical units (LUs). Compatible PAV operations can be performed only on 3390 LVIs.