Hitachi TrueCopy for z/OS (T1711-96009, June 2006)

TrueCopy for z/OS user guide 23
The MCU and RCU can be defined separately for each TC390 pair. The
XP1024/XP128/XP12000/XP10000 CU can function simultaneously as an MCU for one or more
M-VOLs and as an RCU for one or more R-VOLs, provided the remote copy connections and ports are
properly configured. The XP1024/XP128/XP12000/XP10000 CU provides up to 32 logical CU images.
TC390 operations can be performed on all logical devices (LDEVs) in all logical CU images. You can use
TC390 to select a CU image in the connected MCU and specify a CU image in the RCU.
CAUTION: If you are connecting the XP1024/XP128/XP12000/XP10000 and other XP disk arrays in a
mixed configuration, verify that each disk array has a unique serial number. Although this would be
extremely rare, it is possible that a serial number overlap could occur. If you have two disk arrays with the
same serial number and you need to configure remote copy pairs between the two disk arrays, contact
your HP account support representative for assistance.
CU Emulation Types
TC390 supports 3990-3, 3990-6, 3990-6E, and 2105 controller emulation types for the MCU and RCU.
The emulation type of the MCU and RCU can be different. The 3990-6, 3990-6E, or 2105 emulation is
required for SMS I/O time-stamping of TC390A recordsets. The 2105 emulation type is required for HPAV
operations.
Changing from 3990 to 2105: If you need to change the emulation from 3990 to 2105 for an
XP1024/XP128/XP12000/XP10000 that has existing HXRC pairs, you must:
1. Stop all jobs and delete all HXRC pairs.
2. Change the CU emulation type of all CHA packages in the XP1024/XP128/XP12000/XP10000 to
2105. Do not intermix 3990 and 2105 emulations in the same disk array.
3. Restart jobs and re-establish HXRC pairs.
NOTE: The PPRC commands are different for 3990 and 2105 emulation types. For more information on
using PPRC TSO commands with 2105 emulation, refer to ”Using PPRC Commands for TrueCopy” on
page 153.
NOTE: For important information on GDPS support and 2105 emulation, see ”GDPS Support” on
page 42.
Volume Pairs (M-VOLs and R-VOLs)
TC390 performs remote copy operations for logical volume pairs established by the user. Each TC390 pair
consists of one main volume (M-VOL) and one remote volume (R-VOL), which are located in different disk
arrays. The TC390 M-VOLs are the primary volumes that contain the original data, and the TC390 R-VOLs
are the secondary or mirrored volumes that contain the backup or duplicate data. The main and remote
volumes must have the same format and capacity.
During normal TC390 operations, the TC390 M-VOL remains available to all hosts at all times for read and
write I/O operations. The RCU rejects all I/Os to a TC390 R-VOL. The R-VOL read option (see ”R-VOL Read
Option” on page 29) allows read-only access to a TC390 R-VOL while the pair is suspended.
TC390 supports a maximum of 16,384 pairs (entire XP1024/XP128/XP12000/XP10000). If the
command device for Business Continuity Manager is defined, the TCz pair can be created up to 16,383
pairs. . TC390 supports the basic logical volume images (LVIs) available on the
XP1024/XP128/XP12000/XP10000, such as 3390-3, 3390-3R, 3390-9, and 3390-L. For information on
LVI requirements and support, see ”Logical Volume Image (LVI)” on page 48.