Hitachi ShadowImage for IBM z/OS User"s Guide (T5213-96002, June 2007)

2-4 About ShadowImage™ for IBM
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z/OS
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Operations
Hitachi ShadowImage™ for IBM
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z/OS
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User’s Guide
License
You need to purchase the SIz license and make sure that there is enough
licensed capacity according to the capacity of pairs you are going to create.
ShadowImage for z/OS regards S-VOLs, T-VOLs, and reserved volumes as the
volumes that require the license capacity of SIz, and manage these volumes.
When you purchase a license for volume capacity for use with ShadowImage
for z/OS, you need to examine how much capacity of volumes you wish to use
as S-VOLs, T-VOLs or reserved volumes. The total capacity of volume that you
can use cannot exceed the maximum volume capacity that is licensed to you.
You must therefore purchase a license for volume capacity that is equal to, or
more than, the total volume capacity you wish to use.
Business Continuity Manager
If you issue the Business Continuity Manager commands to the storage system
from the mainframe hosts, you can create, split, resynchronize, or delete SIz
pairs, or you can display the pair status. For details about the Business
Continuity Manager commands, see Chapter 6.
PPRC Host Software
ShadowImage for z/OS supports the IBM PPRC host software functions,
including TSO PPRC commands and ICKDSF PPRCOPY commands. SIz pairs
can be added, split, resynchronized, and deleted using these PPRC commands.
Chapter 7 describes and provides instructions for using PPRC commands to
create and maintain SIz pairs on the USP V storage system.
ShadowImage for z/OS Operations
This section describes the main operations of ShadowImage for z/OS.
Set Reserve Attribute Operation
The ShadowImage for z/OS set reserve attribute operation reserves a volume
so that it can be used as an SIz T-VOL. Reserved volumes can only be used as
SIz T-VOLs. The USP V storage system rejects all write operations to reserved
volumes (unless in Split or V-Split status). You can reserve up to 16,384
volumes in one USP V storage system.
Note: When TSO or ICKDSF commands are used to establish SIz pairs, the
T-VOLs do not need to be reserved. The CESTPAIR and PPRCOPY ESTPAIR
commands require that potential T-VOLs be offline to the host. For details, see
Chapter 7.