Hitachi HPAV for z/OS user guide (HITA737-96006, June 2008)
Table Of Contents
- Contents
- Compatible PAV Function for the XP1024/XP128/XP12000/XP10000
- Overview of Compatible PAV Operations
- Preparing for Compatible PAV Operations
- Performing Compatible PAV Operations
- Monitoring Compatible PAV Activities
- Additional MVS Commands
- GTF I/O Tracing
- Figure 13 Sample Output of Display Command - Compatible PAV Base Device with 5 Aliases
- Figure 14 Sample Output of Display Command - Compatible Hyper PAV with 16 Aliases
- Figure 15 DEVSERV DISPLAY PATHS Command
- Figure 16 Sample DEVSERV QPAV Command (Compatible PAV)
- Figure 17 Sample DEVSERV QPAV Command (Compatible Hyper PAV)
- Figure 18 Sample Output of DEVSERV QPAV,SSID=xxxx Command (Compatible PAV)
- Figure 19 Sample Output of DEVSERV QPAV,SSID=xxxx Command (Compatible Hyper PAV)
- Figure 20 Sample Output of DS QP,xxxx,VOLUME Command (Compatible PAV)
- Figure 21 Sample Output of DS QP,xxxx,VOLUME Command (Compatible Hyper PAV)
- Figure 22 Sample Output of D IOS,HYPERPAV Command
- Using HCD to Define and View XP1024/XP128/XP12000/XP10000 LCUs and Compatible PAV Devices
- Using HCD to Define an XP1024/XP12000/XP10000 LCU and the Base and Alias Devices
- Figure 23 Basic HCD Panel
- Figure 24 Define, Modify, Or View Configuration Data
- Figure 25 Add Control Unit Panel
- Figure 26 Selecting the Operating System
- Figure 27 Select, Change Option
- Figure 28 Control Unit Chpid, CUADD, and Device Address Range Addressing
- Figure 29 Define, Modify, Or View Configuration Data
- Figure 30 I/O Device List
- Figure 31 Add Device
- Figure 32 Device / Processor Definition Panel - Selecting the Processor ID
- Figure 33 Define Device / Processor Panel
- Figure 34 Define Device to OS Configuration Window - Selecting the OS Configuration
- Figure 35 Select / Disconnect Option
- Figure 36 Define Device Parameters / Features
- Displaying Compatible PAV Device Parameters
- Using HCD to Define an XP1024/XP12000/XP10000 LCU and the Base and Alias Devices
- Checking the WLM PAV Settings
- Settings about Compatible Hyper PAV
- Index
HPAV for z/OS user guide for the XP128/XP1024/XP12000/XP10000 11
1 Compatible PAV Function for the
XP1024/XP128/XP12000/XP10000
Compatible PAV (Hitachi Parallel Access Volume) function enables a zSeries® and S/390® host system to
issue multiple I/O requests in parallel to logical devices (LDEVs) on an
XP1024/XP128/XP12000/XP10000. When Compatible PAV is not used, the host system can start only
one I/O request to a device at a time and must wait for the I/O to complete before starting another I/O
request to the same device. Compatible PAV allows the host system to start multiple I/O requests to the
same device at the same time through the alias addresses assigned to a device. When Compatible PAV is
used, the zSeries and S/390 host computer has substantially faster access to the data stored in the
XP1024/XP128/XP12000/XP10000.
The two types of devices used in Compatible PAV operations are base devices and alias devices. The base
devices are the physically installed and formatted volumes in a logical control unit (maximum 256) that can
contain data. The alias devices are the volumes that are not physically installed in the same logical control
unit (alias = 256 - base). Every logical controller can support up to 256 devices. The maximum number of
these Logical Control Units (or LCU's) per XP depend upon the XP model.( for XP12K, 255 LCU's; for
XP10K, 64 LCU's for XP1024 and XP128 32 LCU's)
Compatible PAV on the Command View XP management station or XP Remote Web Console configures
Compatible PAV devices on the XP1024/XP128/XP12000/XP10000, such as assigning aliases to base
devices, canceling aliases, and so forth. The Command View XP management station or XP Remote Web
Console is attached to and communicates directly with the XP1024/XP128/XP12000/XP10000 through a
private LAN.
The Workload Manager (WLM) host software function enables the zSeries and S/390 host to use the
Compatible PAV functionality of the XP1024/XP128/XP12000/XP10000. WLM compatibility mode
provides static Compatible PAV functionality and WLM goal mode provides dynamic Compatible PAV
functionality. The XP1024/XP128/XP12000/XP10000 can support static or dynamic compatible PAV (the
XP12K/10K also Hyper PAV). When static Compatible PAV is used, the number of aliases assigned to
each base device does not change. For dynamic Compatible PAV, the number of aliases assigned to a
base device can change depending on the number of host I/O requests to that device and the goals as
they were defined in the WLM. For more information on static and dynamic Compatible PAV, see ”Static
and Dynamic Compatible PAV Operations” on page 17.