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

2-14 About TrueCopy for z/OS Operations
Hitachi Universal Storage Platform V TrueCopy for IBM z/OS User’s Guide
Remote Copy Operations
Figure 2-2 illustrates the two types of TrueCopy for z/OS remote copy
operations: initial copy and update copy. To reduce the overhead associated
with these remote copy activities and maximize data transfer, the USP V
utilizes a special write command which is allowed only for TCz initial and
update copy operations. This command transfers the control parameters and
the FBA-format data for consecutive updated records in a track using a single
write operation.
Host Processor
at Main Site
Write I/O Initial Copy
Update Copy
Disk Subsystem
(MCU)
M-VOL
Disk Subsystem
(RCU)
R-VOL
Figure 2-2 TrueCopy for z/OS Remote Copy Operations
This section describes the following aspects of TrueCopy for z/OS remote copy
operations:
• Initial copy operations
• Update copy operations
• Read and Write I/O Operations for TrueCopy Volumes
• S-VOL Write Option