Hitachi TrueCopy for IBM z/OS User and Reference Guide (T5211-96001, June 2007)

About TrueCopy for z/OS Operations 2-61
Hitachi Universal Storage Platform V TrueCopy for IBM z/OS User’s Guide
SIz
S-VOL
T-VOL
M-VOL
R-VOL
TCz
Figure 2-8 TrueCopy for z/OS and ShadowImage for z/OS: Shared M-
VOL/T-VOL
Caution: When you share a TCz R-VOL with an SIz S-VOL as shown in
Figure 2-6 or Figure 2-7 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.
Universal Replicator for z/OS (URz)
TCz volumes can be assigned to URz pairs. For further information on URz,
please refer to the Universal Replicator for IBM z/OS User's Guide.
Virtual LVI
Virtual LVI volumes can be assigned to TCz pairs, as long as the R-VOL has the
same or larger capacity than the M-VOL. If you need to perform Virtual
LVI/LUN operations on an existing TCz M-VOL or R-VOL, you must release the
pair first to return the volume to simplex status. For further information on
Virtual LVI/LUN, please refer to the Virtual LVI/LUN and Volume Shredder
User’s Guide.
Cache Residency Manager
The volumes that are applied Cache Residency Manager can be assigned to
TCz pairs, and Cache Residency Manager operations can be performed on TCz
M-VOLs and R-VOLs. For further information on Cache Residency Manager,
please refer to the Cache Residency Manager User's Guide.