5 about version 2 operations, How version 2 works, Establishing a version 2 relationship – HP StorageWorks XP Remote Web Console Software User Manual
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5 About Version 2 Operations
The storage system is functionally compatible with Version 2 of the FlashCopy host software function.
PPRC TSO commands, DFSMSdss commands, DFSMSdss commands, ICKDSF commands, and/or
ANTRQST Macro commands are used to perform FlashCopy Version 2 operations on the storage
system.
This chapter provides an overview of Version 2 operations.
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Unless otherwise specified, the term storage system in this guide refers to the following disk arrays:
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XP24000 Disk Array
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XP20000 Disk Array
The GUI illustrations in this guide were created using a Windows computer with the Internet Explorer
browser. Actual windows may differ depending on the operating system and browser used. GUI
contents also vary with licensed program products, storage system models, and firmware versions.
How Version 2 Works
Version 2 provides 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 access data that is copied to the targeted
volume.
Like Version 1, you can also specify a range of data to be copied when you establish a Version
2 relationship, which is called an 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 and 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.
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About Version 2 Operations