Hitachi Universal Storage Platform VM - Manual (Page 54)

3-10 Functional and Operational Characteristics
Hitachi Universal Storage Platform V/VM User and Reference Guide
System Option Modes, Host Modes, and Host Mode Options
System Option Modes
To provide greater flexibility and enable the Universal Storage Platform V/VM
to be tailored to unique customer operating requirements, additional
operational parameters, or system option modes, are available. At installation,
the modes are set to their default values (specified below). Be sure to discuss
these settings with your Hitachi Data Systems team. The system option modes
can only be changed by a Hitachi Data Systems representative.
Table 3-1 lists the system option mode information for Universal Storage
Platform V/VM microcode 60-05-06-00/00. Table 3-2 specifies the relationship
between modes 503 and 269 for Storage Navigator operations. Table 3-3
specifies the relationship between modes 503 and 269 for SVP operations.
The system option mode information may change in future microcode
releases. Contact your Hitachi Data Systems representative for the latest
information on the USP V/VM system option modes.
Table 3-1 System Option Modes
Mode Category Function Default MCU/RCU
20 TrueCopy for z/OS R-VOL read only function. OFF RCU
36 TrueCopy for z/OS Setting default function (CRIT=Y) option for SVP panel (TCz). OFF MCU
64 TrueCopy for z/OS Mode 64 = ON:
ƒ When receiving the Freeze command, in the subsystem,
pair volumes that fulfill the conditions below are suspended
and the status change pending (SCP) that holds write I/Os
from the host is set. The path between MCU and RCU is
not deleted. Query is displayed only but unusable.
ƒ When receiving the RUN command, the SCP status of the
pairs that fulfill the conditions below is released.
ƒ When a Failure Suspend occurs while the Freeze Option
Enable is set, except the pair in which the Failure Suspend
occurs, other pairs that fulfill the conditions below go into
SCP state.
Conditions:
ƒ TrueCopy Sync M-VOL
ƒ Mainframe Volume
ƒ Pair status: Duplex/Pending
OFF MCU/RCU