The disk group block alignment has two values: 1 block or 8k (8 kilobytes).

All CDS disk groups must have an alignment value of 8k.

All disk group versions before version 110 have an alignment value of 1 block, and they retain this value if they are upgraded to version 110 or later.

A disk group that is not a CDS disk group, and which has a version of 110 and later, can have an alignment value of either 1 block or 8k.

The alignment for all newly initialized disk groups in VxVM 4.0 and later releases is 8k. This value, which is used when creating the disk group, cannot be changed. However, the disk group alignment can be subsequently changed.