HP Veritas Volume Manager 5.0 -UX 11i v3 plex, plex, plex, plex, plex, plex, Split, Split, Volume, plexes, Volume, Volume, plexes, Volume, Volume, plexes, as well, Snapshot, Snapshot, DCO plex

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
				Split						as well.
								?
					Snapshot
	Volume DCO				DCO plex
		plexes

Volume 1	Volume 2	Snapshot
data plexes	data plexes		plex

			X
		?			?
				Snapshot
Volume 1 DCO				DCO plex
	plexes

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