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

3-2 Preparing for ShadowImage™ for z/OS
®
Operations
Hitachi ShadowImage™ for IBM
®
z/OS
®
User’s Guide
System Requirements
SIz operations involve the USP V storage system containing the S-VOLs and
T-VOLs, the licensed ShadowImage for z/OS feature enabled on the Storage
Navigator computer. The SIz system requirements are as follows.
Volume Requirements
The requirements for the volumes to be used as SIz pairs are as follows:
• RAID level
The RAID level combinations of the S-VOL and the T-VOL of an SIz pair
must be one of the following.
Table 3-1 Supported Combinations of RAID Levels
S-VOL T-VOL
RAID1 RAID1
RAID1 RAID5
RAID1 RAID6
RAID5 RAID1
RAID5 RAID5
RAID5 RAID6
RAID6 RAID1
RAID6 RAID5
RAID6 RAID6
• Types of volumes
Besides normal volumes, you can use external volumes and custom-sized
volumes. When using external volumes or customized volumes, please note
the following points:
– External volumes
The license of Universal Volume Manager is required.
– Custom-sized volumes
The license of Virtual LVI is required. To create an SIz pair with custom-
sized volumes, S-VOL must be paired with T-VOLs of the same capacity
and the same emulation type.
• Emulation type
Only volumes with mainframe emulation type such as 3390-3, 3390-3A,
6588-1 can be used.
You need to select the volumes of the same emulation type for S-VOL and
T-VOL. However, as for the DKC emulation types, there is no restriction.
The DKC emulation type for the S-VOL and T-VOL can be the same or
different (for example, 3990 S-VOL and 2105 T-VOL).