27.12.2012 Views

z/VM: CP Commands and Utilities Reference - z/VM - IBM

z/VM: CP Commands and Utilities Reference - z/VM - IBM

z/VM: CP Commands and Utilities Reference - z/VM - IBM

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

SET WRKALLEG<br />

SET WRKALLEG<br />

►►<br />

Set<br />

Authorization<br />

Purpose<br />

WRKALleg<br />

Oper<strong>and</strong>s<br />

Usage Notes<br />

ON<br />

OFF<br />

Privilege Class: G<br />

Use SET WRKALLEG to turn virtual working allegiance simulation on or off for one<br />

or more minidisks. Working allegiance guarantees that if multiple guests (or one<br />

guest using multiple virtual devices) start I/O to the same device, one channel<br />

program will run to completion or be terminated before another channel program is<br />

allowed to begin. When WRKALLEG is off, <strong>CP</strong> may interleave execution of guest<br />

channel programs to the same minidisk.<br />

Note: You must have a write link to the specified minidisks to issue this comm<strong>and</strong>.<br />

ON<br />

▼<br />

vdev<br />

vdev1-vdev2<br />

1430 z/<strong>VM</strong>: <strong>CP</strong> <strong>Comm<strong>and</strong>s</strong> <strong>and</strong> <strong>Utilities</strong> <strong>Reference</strong><br />

indicates that virtual working allegiance will be activated for the mindisk(s)<br />

specified.<br />

OFF<br />

indicates that virtual working allegiance will be ended for the minidisk(s)<br />

specified.<br />

vdev<br />

vdev1-vdev2<br />

is the virtual device number or a range of virtual device numbers of the<br />

minidisk(s).<br />

1. This comm<strong>and</strong> must be used when running two or more z/OS guests as part<br />

of a Sysplex configuration using the cross-system coupling facility (XCF)<br />

component of z/OS. SET WRKALLEG ON must be used for any minidisk<br />

containing the XCF couple dataset to maintain cross-system lock integrity (<strong>and</strong><br />

thereby, data integrity) within the sysplex.<br />

2. <strong>VM</strong> supports a z/OS guest’s participation in a Sysplex configuration only if all<br />

participating z/OS systems are guests of the same <strong>VM</strong> host. Environments<br />

which include a z/OSsystem running natively in a separate processor partition,<br />

or as a guest of a different <strong>VM</strong> system are not supported.<br />

3. This comm<strong>and</strong> is rejected for full-pack minidisks on a shared real volume.<br />

Virtual working allegiance is incompatible with sharing real DASD. SET<br />

WRKALLEG is only for sharing virtual devices.<br />

4. This comm<strong>and</strong> is rejected for dedicated DASD. Working allegiance is only<br />

necessary for shared minidisks. Virtual working allegiance is incompatible with<br />

sharing real DASD. SET WRKALLEG is only for sharing virtual devices.<br />

►◄

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!