Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide

To perform the same snapshot image operations on multiple virtual disks, you can create a consistency group containing the virtual disks. Any operation performed on the consistency group is performed simultaneously on all of the virtual disks in that group, which creates consistent copies of data between each virtual disk. Consistency groups are commonly used to create, schedule, or rollback virtual disks.

Each virtual disk belonging to a consistency group is referred to as a member virtual disk. When you add a virtual disk to a consistency group, the system automatically creates a new snapshot group that corresponds to this member virtual disk. You can set up a schedule for a consistency group to automatically create a snapshot image of each member virtual disk in the group at a specific time in the future or on a regular basis.

A consistency group, pools multiple virtual disks together, enabling you to take a snapshot of all virtual disks at the same point in time. This creates a synchronized snapshot of all the virtual disks and is especially suitable for applications that span multiple virtual disks. For example, a database application containing log files on one virtual disk and the database on another.