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

About ShadowImage™ for IBM
®
z/OS
®
Operations 2-25
Hitachi ShadowImage™ for IBM
®
z/OS
®
User’s Guide
Caution: When you share an SIz S-VOL with a TCz R-VOL as shown in Figure
2-11, the write operation to the TCz M-VOL takes time. Especially, when the
SIz pair is in the V-Split status, the write operation to the TCz M-VOL may
takes extra time according to the time for copying process of the SIz pair.
In addition, note that in the case of TCzA, the TCz pair may be suspended by
failure because of the shortage of the capacity of its side file.
Caution: When you share an SIz S-VOL with a TCz R-VOL as shown in Figure
2-11, Quick Restore or Reverse Copy can not be executed. The command will
be rejected if executed.
The configuration shown in Figure 2-12 is an example of a volume, which is
functioning as both a TCz M-VOL and an SIz S-VOL, while the R-VOL of the
same TCz pair is also functioning as the S-VOL of another SIz pair. This
configuration allows you to:
• Use ShadowImage for z/OS to provide on-site backup copies of TCz
M-VOLs and R-VOLs, and/or
• Use TCz to provide remote backup of SIz S-VOLs.
TCz R-VOL
SIz S-VOL
SIz T-VOL
Storage system 2
Storage system 1
TCz M-VOL
SIz S-VOL
SIz T-VOL
TrueCopy for z/OS
ShadowImage
for z/OS
ShadowImage
for z/OS
Figure 2-12 SIz and TCz: Shared S-VOL / M-VOL and S-VOL / R-VOL
The configuration shown in Figure 2-13 is an example of a volume functioning
as both an SIz T-VOL and a TCz M-VOL.