User guide

System option modes B–15
Hitachi Unified Storage VM Block Module Hardware User Guide
725 Universal
Volume
Manager
This option determines an action when Not Ready is
returned from the external volume.
Mode 725 = ON:
When Not Ready is returned, the external path is
blockedand the path status can be automatically
recovered (Not Ready blockade). Note that the two
behaviors, automatic recovery and blockade, may be
repeated.
From version 60-05-06-00/00, the following is added.
For the device of Not Ready blockade, the Device Health
Check is executed after 30 seconds.
Mode 725 = OFF (default):
When Not Ready is returned 3 times in 3 minutes, the
path is blocked and the path status cannot be
automatically recovered (Response error blockade).
Note:
1. For R700 70-01-62-00/00 and lower (within 70-01-
xx range)
a. Applying this SOM is prohibited when USP V/VM
is used as an external subsystem and its external
volume is DP-VOL.
b. Applying this SOM is recommended when the
above condition (1) is not met and SUN storage
is used as an external storage.
c. Applying this SOM is recommended if the above
condition (1) is not met and a maintenance
operation such as firmware update causing
controller reboot is executed on the external
storage side while a storage system other than
Hitachi product is used as an external
subsystem.
2. For R700 70-02-xx-00/00 and higher
a. Applying this SOM is prohibited when USP V/VM
is used as an external subsystem and its external
volume is DP-VOL.
b. Applying this SOM is recommended when the
above condition (a) is not met and SUN storage
is used as an external storage.
c. Applying this SOM is recommended when the
above condition (1) is not met and EMC CX series
or Fujitsu Fibre CAT CX series is used as an
external storage.(4) Applying this SOM is
recommended if the above condition
d. Is not met and a maintenance operation such as
firmware update causing controller reboot is
executed on the external storage side while a
storage system other than Hitachi product is
used as an external subsystem.
Continued
OFF .
Mode Category Description Default
MCU/
RCU