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

170 TrueCopy for the XP1024/XP128/XP12000/XP10000
The CGROUP command has two parameters, FREEZE and RUN. The CGROUP/FREEZE command stops
all host I/O operations to the specified TC390 M-VOLs as well as all TC390 update copy operations to
their associated R-VOLs. The CGROUP/RUN command changes the pair status to suspended and allows
the M-VOLs to start accepting host I/Os.
NOTE: For 2105 controller emulation, do not use the FREEZE option. Use the CGROUP option of the
CESTPATH command (see
”CESTPATH” on page 156).
CAUTION: The XP1024/XP128/XP12000/XP10000 executes the CGROUP command on TC390
Synchronous pairs. TC390A does not support the CGROUP TSO command. If CGROUP is issued to a
TC390A volume, the XP1024/XP128/XP12000/XP10000 will reject the command. CGROUP
(FREEZE/RUN) operations on TC390 Synchronous pairs do not affect TC390A pairs in any way.
Requirements
The CGROUP command can be issued only to a TC390 Synchronous M-VOL or a simplex volume in the
MCU. If CGROUP is issued to a TC390 R-VOL, the RCU will reject the CGROUP command (F/M=0F,
TC390 error code=58). The CGROUP command must be issued to each logical CU image of the MCU,
unless the XP1024/XP128/XP12000/XP10000’s mode 64 (see description below) is enabled.
The requirements for CGROUP (FREEZE/RUN) support are:
• MCU: The MCUs to which the CGROUP command will be issued must be
XP1024/XP128/XP12000/XP10000s (all-mainframe and multiplatform disk arrays are both
supported). For disaster recovery implementations, you must use the
XP1024/XP128/XP12000/XP10000 at both sites because the RCUs will become MCUs in the event
of a disaster.
• PPRC: The host systems at the main and remote sites must have IBM PPRC support as well as the PPRC
ERP PTF installed. ICKDSF does not support the CGROUP command.
• SSIDs: The MCUs to which the CGROUP command will be issued must have consecutive SSIDs. The HP
representative configures the SSIDs on the XP1024/XP128/XP12000/XP10000 SVP.
CAUTION: MVS requires that the disk array be offline during SSID changes. Reconfiguring SSIDs
is therefore a disruptive event that must be carefully planned.
• FREEZE Option (3990 only): The FREEZE option must be enabled on the MCUs to which the CGROUP
command will be issued. If not enabled, the MCU will reject the CGROUP TSO command. The FREEZE
option is enabled using the Command View XP management station or XP Remote Web Console (RCU
Option window). Enable the FREEZE option only after adding all MCU-RCU paths.
NOTE: Mode 104 (see below) changes the default FREEZE option from disabled to enabled.
Mode 104 is invalid for 2105 emulation.
For 2105 controller emulation, do not use the FREEZE option. Use the CGROUP option of the
CESTPATH command (see
”CESTPATH” on page 156).
The definition of the LINK Parameter for the CESTPATH command will be expanded to specify the FREEZE
option on an LCU pair basis. The FREEZE option set by the CESTPATH command is effective until another
CESTPATH command that specifies the same LCU pair but a different FREEZE Option is issued. The
command syntax and parameter definitions are as follows (3990 only):
CESTPATH PRIM(x’ssid’ serial#) SEC(x’ssid’ serial#) LINK(x’ppppllcc’, ‘ppppllcc’,...) DEVN(x’1234’)
where: