HP XP7 Owner's Manual page 35

Table 1 1 System option modes (continued)
Mode Category
696 Open
701 External Storage
Description
Read JNL or JNL Restore is not prevented when the Write Pending
rate on RCU exceeds 60% (the same as before).
Notes:
1. This mode can be set online.
2. This mode should be set per customer's requests.
3. If the Write Pending status long keeps 60% or more on RCU,
it takes extra time for the initial copy to be completed by
making up for the prevented copy operation.
4. If the Write Pending status long keeps 60% or more on RCU,
the pair status may become Suspend due to the JNL-Vol being
full.
This mode is available to enable or disable the QoS function.
Mode 696 = ON:
QoS is enabled. (In accordance with the Share value set to SM,
I/Os are scheduled. The Share value setting from RMLIB is
accepted)
Mode 696 = OFF (default):
QoS is disabled. (The Share value set to SM is cleared. I/O
scheduling is stopped. The Share value setting from host is
rejected)
Note:
1. Set this mode to ON when you want to enable the QoS
function.
Issues the Read command at the logical unit discovery operation
using Ext Stor.
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
System option modes, host modes, and host mode options
Default MCU/RCU
OFF .
OFF .
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