Mode
Category
Description
Default
MCU/RCU
alternate path delays and host MIH or time-out
may occur.
8.
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 delay to the RI/O
occurs constantly on this path due to path
failure or link delay, host MIH or time-out may
occur due to response time accumulation for
each RI/O retried within 5 seconds.
9.
Even though this SOM is set to ON, if Mainframe
host MIH time or Open host time-out time is set
to 10 seconds or less, host MIH or time-out may
occur due to a path failure between storage
systems.
10.
Operation commands are not available for
promptly switching to an alternate path.
11.
This SOM works for the pair for which initial pair
creation or Resync operation is executed.
12.
Micro-program downgrade to an unsupported
version cannot be executed unless all the TC
and GAD pairs are suspended or deleted.
13.
For operational
specifications
in each
combination of MCU and RCU of TC, contact
customer support (see SOM784 sheet).
14.
For GAD pairs, this SOM is
effective
if the
microcode version supports GAD.
15.
This SOM does not support iSCSI paths between
storage systems. When iSCSI is used for paths
between storage systems, the time to switch to
an alternate path cannot be reduced. For this, if
a failure occurs on a path between storage
systems in an environment where host time-out
time is short, a time-out may occur on the host
side. A time-out may also occur on the host side
when a failure occurs on an iSCSI path between
storage systems if storage system paths of Fibre
and iSCSI coexist in an environment where host
time-out time is short so that the
configuration
where storage system paths of Fibre and iSCSI
coexist is not supported too.
System option modes
Appendix B: System option modes
System Administrator Guide for VSP Gx00 models and VSP Fx00 models
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