HP XP P9500 Owner's Manual page 36

Table 1 1 System option modes (continued)
Mode Category
704 Open and
Mainframe
720 External Storage
(Mainframe and
Open)
721 Open and
Mainframe
725 External Storage
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36 Functional and operational characteristics
Description
b. An external volume to which Nondisruptive Migration
(NDM) attribute is set exists.
To reduce the chance of MIH, this option can reduce the priority
of BC, VM, CoW Snapshot, Flash Copy or Resync copy internal
IO requests so that host IO has a higher priority. This mode
creates new work queues where these jobs can be assigned with
a lower priority.
Mode 704 = ON:
Copy processing requested is registered into a newly created
queue so that the processing is scheduled with lower priority than
host I/O.
Mode 704 = OFF: (Default)
Copy processing requested is not registered into a newly created
queue. Only the existing queue is used.
Note:
If the PDEV is highly loaded, the priority of Read/Write processing
made by BC, VM, Snapshot, Compatible FlashCopy or Resync
may become lower. As a consequence the copy speed may be
slower.
Supports the Active Path Load Balancing (APLB) mode.
Mode 720 = ON:
The alternate path of EVA (A/A) is used in the APLB mode.
Mode 720 = OFF (default):
The alternate path of EVA (A/A) is used in the Single mode.
Note:
Though online setting is available, the setting will not be enabled
until Check Paths is performed for the mapped external device.
When a parity group is uninsulated or installed, the following
operation is performed according to the setting of mode 721.
Mode 721 = ON:
When a parity group is uninstalled or installed, the LED of the
drive for uninstallation is not illuminated, and the instruction
message for removing the drive does not appear. Also, the
windows other than that of parity group, such as DKA or DKU,
are unavailable to select.
Mode 721 = OFF (default):
When a parity group is uninstalled or installed, the operation is
as before: the LED of the drive is illuminated, and the drive must
be unmounted and remounted.
Notes:
1. When the RAID level or emulation type is changed for the
existing parity group, this option should be applied only if the
drive mounted position remains the same at the time of the
parity group uninstallation or installation.
2. After the operation using this option is completed, the mode
must be set back to OFF; otherwise, the LED of the drive to be
removed will not be illuminated at subsequent parity group
uninstalling operations.
This option determines the action that will be taken when the
status of an external volume is Not Ready
Mode 725 = ON:
Default MCU/RCU
OFF .
OFF .
OFF .
OFF .