HP 3PAR Operating System Software - Manual (Page 190)

27 Volume Groups
See: For more information on:
“Why Use Volume Groups” (page 190) What volume groups are and why Remote Copy uses them
“How Volume Groups Work” (page 191) How Remote Copy operates on virtual volumes in a volume
group
“Rules for Forming Volume Groups” (page 191) Volumes you can add to volume groups
“Rules for Adding Snapshots to Volume Groups” (page 191)
“Natural Direction of Replication” (page 192) How Remote Copy names the secondary volume group
“How Volume Groups Are Organized on the Remote Copy
Pair” (page 192) Where primary and secondary volume groups reside
“Natural Direction of Replication” (page 192) How Remote Copy copies data from one volume group to
another
“Linking Virtual Volumes in Volume Groups” (page 192) Linking primary to secondary virtual volumes so Remote
Copy can copy data from one to the other
Additional Information:
•
“Volume Group Modes” (page 194)
•
“Synchronization Types and Limits” (page 197)
Why Use Volume Groups
Most of the Remote Copy operations you perform are on sets of virtual volumes that have been
formed into groups, called Remote Copy volume groups.
•
You form volume groups in order to maintain consistent data across a set of virtual volumes.
For example, applications might issue dependent writes to a number of virtual volumes. If you
add these related virtual volumes to one volume group, the database and other applications
can correctly process the data.
•
You can form volume groups to simplify administration. Even if a set of virtual volumes are
unrelated and do not need write consistency, you can add the volumes to a single volume
group to reduce the number of commands that you need to issue.
For example, a single start/stop/setrcopygroup command applies to all the volumes
in the specified volume group.
190 Volume Groups