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.
5. When RAID 500 is used on P-VOL side, the mode cannot
be used. If the mode is set to ON, SSB=8E08 on P- VOL
side and SSB=C8D1 on S-VOL side may frequently be
output.
696
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:
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.
OFF
701
This option is used to issue the Read command at the LU
discovery operation using UVM.
Mode 701 = ON:
The Read command is issued at the LU discovery operation.
Mode 701 = OFF:
The Read command is not issued at the LU discovery
operation.
Notes:
1. When the external storage is USP/NSC and the Open
LDEV Guard attribute (VMA) is defined on an external
device, set the mode to ON.
2. When this option is set to ON, it takes longer time to
complete the LU 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.
OFF
60
System option modes
Hitachi Virtual Storage Platform G400, G600 Hardware Reference Guide
Summary of Contents for Virtual Storage Platform G400
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Page 6: ...6 Hitachi Virtual Storage Platform G400 G600 Hardware Reference Guide ...
Page 16: ...16 Preface Hitachi Virtual Storage Platform G400 G600 Hardware Reference Guide ...
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