Mode
Category
Description
Default
MCU/RCU
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 Hitachi TrueCopy
®
for Mainframe or
global-active device. It is 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, TC Sync or global-active device specification.
Mode 784 = ON
This mode reduces the internal MIH time of RI/Os so that
when a path failure occurs between controllers on which
the host MIH time is set to 15 seconds, update I/Os can be
quickly processed by using an alternate path. This lowers
the possibility of host MIH occurrence.
Notes:
1.
This mode is used when the MIH time on a
mainframe host is set to 15 seconds, or the timeout
time on an open system host is set to 15 seconds or
less.
2.
The purpose of this mode is to reduce the RI/O MIH
time to 5 seconds.
3.
This function is available for all the TC Sync for
mainframe, TC Sync, and GAD pairs on the
subsystem, unable to specify the pairs that are using
this function or not.
4.
To apply the mode to TC Sync, the firmware must be
the supported version on both sides.
5.
For a TC Sync 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 Device Manager - Storage
Navigator and CCI is not “5 seconds” but is what set
at RI/O registration.
6.
For a TC Sync for z/OS TC Sync, or GAD 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
7.
If a failure occurs on the switched path between
controllers, mainframe host MIH or open server time-
out may occur.
8.
If a VSD to which the path between controllers
belongs is overloaded, switching to an alternate path
delays and host MIH or time-out may occur.
9.
If an RI/O retry occurs due to other factors than RI/O
MIH (5 sec), such as a check condition report issued
from RCU to MCU, the RI/O retry is performed on the
same path instead of an alternate path. If a response
System option modes
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Hitachi Virtual Storage Platform G1000, G1500, and Virtual Storage Platform F1500 Hardware Guide
Содержание F1500
Страница 12: ...12 Preface Hitachi Virtual Storage Platform G1000 G1500 and Virtual Storage Platform F1500 Hardware Guide ...
Страница 50: ...50 Introduction Hitachi Virtual Storage Platform G1000 G1500 and Virtual Storage Platform F1500 Hardware Guide ...
Страница 106: ...106 Site preparation Hitachi Virtual Storage Platform G1000 G1500 and Virtual Storage Platform F1500 Hardware Guide ...
Страница 120: ...120 Troubleshooting Hitachi Virtual Storage Platform G1000 G1500 and Virtual Storage Platform F1500 Hardware Guide ...
Страница 132: ...132 Specifications Hitachi Virtual Storage Platform G1000 G1500 and Virtual Storage Platform F1500 Hardware Guide ...
Страница 182: ...182 System option modes Hitachi Virtual Storage Platform G1000 G1500 and Virtual Storage Platform F1500 Hardware Guide ...
Страница 204: ...204 Glossary Hitachi Virtual Storage Platform G1000 G1500 and Virtual Storage Platform F1500 Hardware Guide ...
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