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Contents
1 Overview..................................................................................................5
Parallel Access Volumes.............................................................................................................5
Base and alias devices..............................................................................................................5
Parallel Access Volumes modes...................................................................................................5
Parallel Access Volumes in dynamic mode...............................................................................6
Parallel Access Volumes in static mode....................................................................................6
Workload Manager..................................................................................................................6
WLM in goal mode..............................................................................................................7
WLM in compatibility mode..................................................................................................7
Hyper Parallel Access Volumes...................................................................................................7
Flow of I/O requests using Parallel Access Volumes.......................................................................7
Flow of I/O requests using Hyper Parallel Access Volumes.............................................................8
2 Requirements and specifications...................................................................9
Requirements...........................................................................................................................9
Functions incompatible with Parallel Access Volumes...................................................................10
IBM CC and Extended Remote Copy (XRC) for Mainframe restrictions............................................10
Sharing Parallel Access Volumes across multiple sysplexes............................................................10
Preventive Service Planning......................................................................................................10
3 Defining devices.......................................................................................11
Selecting optimum base/alias device ratio.................................................................................11
Defining an LCU.....................................................................................................................11
Defining a base or alias device................................................................................................14
Finding a device eligible for dynamic Parallel Access Volumes management...................................17
Address mapping between base and alias devices.....................................................................21
4 Preparing for Parallel Access Volumes operations..........................................22
Setting the WLM mode............................................................................................................22
Enabling Hyper Parallel Access Volumes on z/OS......................................................................23
Enabling Hyper Parallel Access Volumes from z/OS on z/VM......................................................23
Setting the MIH timer value......................................................................................................24
5 Performing Parallel Access Volumes operations.............................................25
Assigning aliases to base volumes............................................................................................25
Removing aliases from base volumes.........................................................................................26
Reassigning aliases ................................................................................................................28
Calculating Parallel Access Volumes used capacity......................................................................28
Refreshing Parallel Access Volumes data....................................................................................29
6 Verifying and monitoring devices................................................................30
Verifying base and alias device definition..................................................................................30
Verifying status of devices per channel path...............................................................................30
Verifying Hyper Parallel Access Volumes aliases from z/OS.........................................................31
Verifying Hyper Parallel Access Volumes aliases from z/OS on z/VM...........................................32
Monitoring with MVS commands..............................................................................................33
DISPLAY command.................................................................................................................33
DEVSERV PATHS command......................................................................................................33
DEVSERV QPAV commands.....................................................................................................34
DISPLAY IOS HYPERPAV command...........................................................................................35
GTF I/O tracing.....................................................................................................................36
VM CP commands for z/VM....................................................................................................36
QUERY CU command.............................................................................................................36
QUERY DASD DETAILS command.............................................................................................37
Contents
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