HP XP7 Owner's Manual page 42

Table 1 1 System option modes (continued)
Mode Category
784 Continuous Access
Synchronous
1 of 2
Continuous Access
Synchronous for
Mainframe
42 Functional and operational characteristics
Description
Mode 776 = OFF (default):
When the status of P-VOL changes to Suspend during a TC/TCA
S-VOL pair suspend or deletion operation from BCM, the F/M=FB
message is output to the host.
Notes:
1. Set this mode to ON in the environment where TC/TCA for
z/OS is used from BCM and the MCU host does not need the
F/M=FB message output during an S-VOL pair suspend or deletion
operation from BCM.
2. If this mode is set to ON, the F/M=FB message is not output
to the host when the status of P-VOL changes to Suspend during
a TC/TCA S-VOL pair suspend or deletion operation from BCM
3. If the PPRC item of CU option is set to NO, the F/M=FB
message is not output to the host regardless of setting of this
mode.
4. If the function switch#07 is set to "enable", the F/M=FB
message is not output to the host regardless of setting of this
mode.
This mode can reduce the MIH watch time of RI/O for a
Continuous Access Synchronous for MainframeS or Continuous
Access Synchronous pair internally so that update I/Os can
continue by using an alternate path without MIH or time-out
occurrence in the environment where Mainframe host MIH is set
to 15 seconds, or Open host time-out time is short (15 seconds
or less). The mode is effective at initial pair creation or Resync
operation for Continuous Access Synchronous Z or Continuous
Access Synchronous. (Not effective by just setting this mode to
ON)
Mode 784 = OFF (default):
The operation is processed in accordance with the TC Sync for
z/OS or TC Sync specification.
Special Direction
(1) The mode is applied to the environment where Mainframe
host MIH time is set to 15 seconds.
(2) The mode is applied to the environment where OPEN host
time-out time is set to 15 seconds or less.
(3) The mode is applied to reduce RI/O MIH time to 5
seconds.
(4) The mode is effective for the entire system.
Notes:
1. This function is available for all the TC Sync for z/OS and TC
Sync pairs on the subsystem, unable to specify the pairs that
are using this function or not.
2. RAID700) To apply the mode to TC Sync, both MCU and RCU
must be RAID700 and micro-program must be the support
version on both sides. If either one of MCU or RCU is
RAID600, the function cannot be applied.
3. For a TC Sync for z/OS or TC Sync pair with the mode
effective (RI/O MIH time is 5 seconds), the setting of RI/O
MIH time made at RCU registration (default is 15 seconds,
which can be changed within range from 10 to 100 seconds)
is invalid. However, RI/O MIH time displayed on Storage
Navigator and CCI is not "5 seconds" but is what set at RI/O
registration.
Default MCU/RCU
OFF MCU/RCU