VERITAS Storage Foundation 4.1 Cross-Platform Data Sharing Administrator's Guide

Chapter 1, Overview
Disk Group Alignment
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In a version 110 disk group, a version 20 DCO volume must have:
◆ Minimum region size of 16K
◆ Incremental region size of 8K
Note The map layout within a Data Change Object (DCO) volume changed with the release of
VxVM 4.0 to version 20. This can accommodate both FastResync and DRL maps within the
DCO volume. The original version 0 layout for DCO volumes only accommodates
FastResync maps.