SANRAD V-Switch manual Adding a Child to a Mirror On-line Copy, Advanced Volume Operations 141

If you are working in

aV-Switch cluster, the child must be added on both V- Switches.

Adding a Child to a Mirror (On-line Copy)

To perform on-line data replication, either by increasing the number of children in a mirrored volume or creating a mirrored copy of any other type of volume, except transparent and snapshot volumes, you can use the CLI command volume mirror add.

Since this is on-line data replication, the source volume does not need to be taken off-line and write operations to the source volume can continue while the mirror is being created. Any data written to the volume will be included in the added child(ren). Use this command to replace a failed disk in a mirrored volume without taking the mirror off-line.

The added child can be any type of volume, except transparent or snapshot, and it must be the same size or greater than the actual capacity of the mirror volume.

In Figure 72, a mirrored volume with two children has another child added. The mirrored volume stays at the head of the hierarchy.

Mir 1T

Ch1	Ch2	Vol X
1T	1T	1T

Mir 1T

Ch1	Ch2
1T	1T

Ch3

1T

10189

Figure 72. Adding Another Child to a Mirror

In Figure 73, page 142 , a concatenated volume becomes one child of a new mirrored volume. This adds a level to the hierarchy. The new mirrored volume becomes the head of the volume hierarchy. The new mirrored volume automatically assumes the LUN from the concatenated volume.

Chapter 8: Advanced Volume Operations 141