Mode
Category
Description
Default
MCU/RCU
784
TrueCopy
Global-active
device
This SOM can reduce the MIH watch time of RI/O for
a TC or GAD 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). This
SOM is
effective
at initial pair creation or Resync
operation for TC or GAD. (Not
effective
by just setting
this SOM to ON.)
This SOM is applied to TC and GAD. This SOM
supports Fibre remote copy paths but not iSCSI.
Mode 784 = ON:
The MIH time of RIO is internally
reduced so that, even though a path failure occurs
between storage systems in the environment where
host MIH time is set to 15 seconds, update I/Os can
be processed by using an alternate path promptly,
lowering the possibility of host MIH occurrence.
Mode 784 = OFF (default):
The operation is
processed in accordance with the TC or GAD
specification.
Notes:
1.
This SOM is applied to the environment where
Mainframe host MIH time is set to 15 seconds.
2.
This SOM is applied to the environment where
OPEN host time-out time is set to 15 seconds or
less.
3.
This SOM is applied to reduce RI/O MIH time to
5 seconds.
4.
This function is available for all the TC and GAD
pairs on the storage system, unable to specify
the pairs that are using this function or not.
5.
For a TC or GAD pair with this SOM
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 Device Manager -
Storage Navigator and CCI is not “5 seconds” but
is what set at RI/O registration.
6.
If a failure occurs on the switched path between
storage systems, Mainframe host MIH or Open
server time-out may occur.
7.
If an MP to which the path between storage
systems belongs is overloaded, switching to an
OFF
Both
System option modes
Appendix B: System option modes
System Administrator Guide for VSP Gx00 models and VSP Fx00 models
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