Hitachi VSP G400 - Page 381

Mode Category Description Default MCU/RCU
1080 Global-active
device
Universal Volume
Manager
This SOM is intended for a case that multiple external
connection paths are connected to a Target port on an
external system with a quorum disk and there is a path
whose performance degrades. For such a case, this SOM can
eliminate impacts on commands run for other external
devices that share the Target port with the quorum disk on
the external system by setting the time to run a reset
command for the Target port to be the same (15 seconds) as
that to run other commands for the other external devices.
Mode 1080 = ON: The time to run the reset command for the
quorum disk on the external system is 15 seconds to
eliminate the impacts on commands run for the other
external devices that share the Target port with the quorum
disk on the external system.
If a response to ABTS is delayed for 12 seconds or longer, the
quorum disk may be blocked.
Mode 1080 = OFF (default): The time to run a reset
command for the quorum disk when performance of a path
degrades is 3 seconds so that a retry is performed by an
alternate path to avoid quorum disk blockage.
Notes:
1. This SOM is applied if avoiding impacts on commands
for other external devices sharing a Target port on an
external system side with a quorum disk is prioritized
over preventing quorum disk blockage when a response
to ABTS is delayed.
The delay is caused due to path performance
degradation in a configuration where the Target port is
shared between external devices and the quorum disk.
2. When connection performance degradation occurs, the
quorum disk blockage is more likely to occur.
OFF
-
1083 Dynamic
Provisioning
Universal Volume
Manager
This SOM enables or disables DP-VOL deletion while an
external volume associated with the DP-VOL with data direct
mapping attribute is not disconnected.
Mode 1083 = ON: DP-VOL deletion is enabled.
Mode 1083 = OFF (default): DP-VOL deletion is disabled.
Notes:
1. This SOM is applied when the following conditions are
met.
• A DP-VOL with data direct mapping attribute is
deleted.
• The data of external volume with data direct
mapping attribute associated with a deletion target
DP-VOL with data direct mapping attribute will not
be used again.
2. When SOM 1083 is set to ON, the data of external
volumes cannot be guaranteed.
3. When DP-VOL deletion is performed without
disconnecting an external volume, the data of the
external volume cannot be guaranteed.
OFF -
System option modes 381
System Administrator Guide for VSP Gx00 models and VSP Fx00 models