Hitachi Virtual Storage Platform, Руководство пользователя и справочник

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Hitachi VSP User and Reference Guide
2–28
Functional and Operational Characteristics
701 Universal
Volume
Manager Issues the Read command at the logical unit
discovery operation using UVM.
Mode 701 = ON:
The Read command is issued at the logical unit
discovery operation.
Mode 701 = OFF:
The Read command is not issued at the logical unit
discovery operation.
Notes:
1. When the Open LDEV Guard attribute (VMA) is
defined on an external device, set the system
option to ON.
2. When this option is set to ON, it takes longer
time to complete the logical unit discovery. The
amount of time depends on external storages.
3. With this system option OFF, if searching for
external devices with VMA set, the VMA
information cannot be read.
4. When the mode is set to ON while the following
conditions are met, the external volume is
blocked.
a. RAID700 70-03-3x-00/00 or higher version is
used on the storage system.
b. An external volume to which Nondisruptive
Migration (NDM) attribute is set exists.
c. The external volume is reserved by the host
5. As the VMA information is USP/NSC specific,
this mode does not need to be ON when the
external storage is other than USP/NSC.
6. Set the mode to OFF when the following
conditions are met.
a. RAID700 70-03-3x-00/00 or higher version is
used on the storage system
b. An external volume to which Nondisruptive
Migration (NDM) attribute is set exists.
OFF .
Mode Category Description Default MCU/RCU