Mainframe Enablers TimeFinder SnapVX and zDP 8.5 Product Guide

Defines whether consistency for all snapshots in a snapset is required.

The CONSistent parameter can be specified on the DEFINE VDG and MODIFY VDG OPTIONS commands.

Syntax

CONSistent({Yes|No})

Options

Yes

(Default) Consistency is managed using Enginuity Consistent Assist (ECA) or SRDF/A Suspend or Resume as appropriate, to hold write I/O on the source volumes during SnapVX ACTIVATE command processing. This is the default value.

NOTE:Because only one method can be used to guarantee consistency across all volumes in a snapset, a VDG cannot contain both SRDF/A and non-SRDF/A volumes simultaneously.

When CONSistent(YES) is specified, a consistency check is performed before each zDP cycle to ensure that active R2s do not have R1 invalid tracks. If any R2s have R1 invalid tracks, message EIP0242W is issued. When the STATUSE debug option is enabled, the message is issued for each R2 with R1 invalid tracks. Otherwise, the message is issued only for the first discovered device with R1 invalid tracks. After all devices have been checked, this process continues every 30 s until all R1 invalid tracks are resolved. A STOP command can be issued to interrupt this process and stop the VDG.

NOTE:With CONSistent(YES), Consistency Exempt (CEXMPT) devices do not cause the VDG to stop unless the VDG is running with MAXRC(0).

No

Consistency for all snapshots in a snapset is not required.