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

TrueCopy for z/OS Usage Scenarios 7-17
Hitachi Universal Storage Platform V TrueCopy for IBM z/OS User’s Guide
5. Use the IBM P/DAS host software function to redirect all application I/Os to
the R-VOL(s) nondisruptively. If the host system does not support P/DAS, use
the following procedure to stop using the M-VOL(s) and switch to the R-
VOL(s):
a) Quiesce all applications using the M-VOL(s).
b) When all update activity to the M-VOL(s) has stopped, connect to the
MCU, select the correct CU, and release the TCz pair(s).
c) If the M-VOL(s) and R-VOL(s) are attached to the same host, vary the M-
VOL(s) offline first, and then vary the R-VOL(s) online. The M-VOL(s) and
R-VOL(s) have the same VOLSERs and cannot be online to the same
host(s) at the same time.
d) If an R-VOL contains more cylinders than its M-VOL, update the R-VOL
volume table of contents (VTOC) using ICKDSF/REFORMAT.
e) If you want to keep the volumes synchronized, establish the same TCz
pair(s) in the reverse direction using the No Copy initial copy option. If
the original M-VOL(s) will be temporarily unavailable for update copy
operations, you can suspend the new pair(s) so that the new MCU keeps
track of changes.
f) Start the applications with the R-VOL(s). When the original M-VOL(s)
become available, you can resynchronize the pair(s) using the Resume
Pair dialog box.