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Contents
1 Overview..................................................................................................5
About Parallel Access Volumes...................................................................................................5
Devices used in Parallel Access Volumes operations.......................................................................5
Base devices.......................................................................................................................5
Alias devices.......................................................................................................................5
Parallel Access Volumes modes...................................................................................................5
Parallel Access Volumes in dynamic mode...............................................................................6
Parallel Access Volumes in static mode....................................................................................7
Workload Manager..................................................................................................................7
WLM in goal mode..............................................................................................................7
WLM in compatibility mode..................................................................................................7
Hyper Parallel Access Volumes...................................................................................................8
I/O request workflow using Parallel Access Volumes......................................................................8
I/O request workflow using Hyper Parallel Access Volumes............................................................8
2 Requirements and specifications.................................................................10
Requirements.........................................................................................................................10
Functions incompatible with Parallel Access Volumes...................................................................11
Parallel Access Volumes shared across multiple sysplexes.............................................................11
3 Defining devices.......................................................................................13
Unused device addresses usage as alias devices........................................................................13
Optimal Parallel Access Volumes results and base-to-alias device ratios.....................................13
Optimal dynamic PAV results and alias devices......................................................................13
Hyper Parallel Access Volumes optimum base/alias device ratio..............................................13
Defining logical control units....................................................................................................13
Defining base or alias devices to host operating systems..............................................................16
Finding a device eligible for dynamic Parallel Access Volumes management...................................20
Address mapping between base and alias devices.....................................................................23
4 Preparing for Parallel Access Volumes operations..........................................24
Setting the WLM operational mode...........................................................................................24
Hyper Parallel Access Volumes enablement from z/OS on z/VM workflow....................................25
Enabling Hyper Parallel Access Volumes on z/OS..................................................................26
Enabling Hyper Parallel Access Volumes from z/OS on z/VM.................................................26
MIH timer value setting workflow..............................................................................................26
5 Performing Parallel Access Volumes operations.............................................27
Assigning alias volumes to base volumes...................................................................................27
Deleting alias volumes from base volumes..................................................................................29
Assigning alias volumes to different base volumes.......................................................................30
Calculating Parallel Access Volumes used capacity......................................................................31
6 Verifying and monitoring devices................................................................32
Verifying the device definitions.................................................................................................32
Verifying the status of devices per channel path..........................................................................32
Verifying Hyper Parallel Access Volumes aliases from z/OS.........................................................33
Verifying Hyper Parallel Access Volumes aliases from z/OS on z/VM...........................................34
Sample of commands run to all base devices and alias devices from z/VM....................................34
MVS commands to monitor Parallel Access Volumes....................................................................35
DISPLAY command.............................................................................................................35
DEVSERV PATHS command.................................................................................................36
DEVSERV QPAV commands.................................................................................................36
Showing the PAV base device status................................................................................36
Contents
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