HP Veritas Volume Manager 5.0 -UX 11i v3 manual Split Snapshot

202Creating and administering disk groups

Reorganizing the contents of disk groups

Figure 4-7 Examples of disk groups that can and cannot be split

Volume	Snapshot
data plexes		plex

Split

Volume DCO	Snapshot
plexes	DCO plex

The disk group can be split as the DCO plexes are on dedicated disks, and can therefore accompany the disks that contain the volume data.

							The disk group cannot be split as the DCO
		Volume		Snapshot
							plexes cannot accompany their volumes.
	data plexes				plex
							One solution is to relocate the DCO plexes.
							In this example, use an additional disk in the
							disk group as an intermediary to swap the
				X			misplaced DCO plexes. Alternatively, to
							improve DRL performance and resilience,
							allocate the DCO plexes to dedicated disks.
Volume DCO				Volume DCO
	plex				plex
			Snapshot
			DCO plex
								The disk group can be split as the
		Volume				Snapshot
								DCO plexes can accompany their
	data plexes						plex
								volumes. However, you may not
								wish the data in the portions of
					?			the disks marked “?” to be moved
								as well.

	Split	?
	Snapshot
Volume DCO	DCO plex
plexes
Volume 1		Volume 2	Snapshot	The disk group cannot
				be split as this would
data plexes		data plexes	plex
				separate the disks
				containing Volume 2’s
				data plexes. Possible
		X		solutions are to
	?		?	relocate the snapshot
				DCO plex to the
				snapshot plex disk, or
		Snapshot		to another suitable
				disk that can be
Volume 1 DCO		DCO plex
				moved.
plexes