HP StorageWorks XP24000 for FlashCopy Mirroring Software User's Guide (T5240-96001, June 2007)

7 About Version 2 Operations
This chapter provides an overview of Version 2 o perations.
How Version 2 Works
Version 2 prov
ides a fast data replication capability. This function allows you to copy the source data to
a
targeted volume virtually or physically. A pair created by Version 2 is called a relationship. Once a
Version 2 relationship is created, hosts can a c cess data that is copied to the targeted volume.
Like Version1, you canalsospecify arange of datatobecopiedwhenyou establishaVersion2
relationship, which is called a n extent. In addition, Version 2 allows you to make multiple copies of
data from one
copy source. When you specify only a part of a volume (that is, an extent) as the copy
source, the capacity of the S-VOL and the T-VOL can be different. You can even specify both the copy
source an d the copy target within the same volume.
Establishing a Version 2 Relationship
To establish a Version 2 relationship, you need to specify the copy source (S-VOL) and copy target (T-VOL)
volumes. When you want to copy data according to dataset, you specify the copy range as an extent in
addition to the copy source and copy target. The smallest unit used to measure an extent is called a track.
You can create multiple relationships from one source. Version 2 allows you to establish up to 16
relationships from one extent, as you can see in the following figure.
XP24000 for FlashCopy Mirroring Software User's Guide
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