3. If workload of the copy target parity group is high, the
copy processing may not be improved even if this mode is
set to ON.
857
This option enables or disables to limit the cache allocation
capacity per MPB (VSP / VSP G1000) or MPU (HUS VM) to
within the prescribed capacity (*) except for Cache
Residency.
*: 128 GB (VSP/HUS VM), 256 GB (VSP G1000).
Mode 857 = ON:
The cache allocation capacity is limited to within the
prescribed capacity.
Mode 857 = OFF:
The cache allocation capacity is not limited to within the
prescribed capacity.
Notes:
(1) This mode is applied to stabilize the performance by
preventing paging of PM control information from occurring.
For details, refer to the section of Virtual Partition Manager
in the guideline.
(2) The cache hit rate may decrease.
(3) The cache allocation capacity per MPB/MPU is limited to
within the prescribed capacity.
OFF
867
All-page reclamation (discarding all mapping information
between DP pool and DP volumes) is executed in DP-VOL
LDEV format. This new method is enabled or disabled by
setting the mode to ON or OFF.
Mode 867 = ON:
LDEV format of the DP-VOL is performed with page
reclamation.
Mode 867 = OFF:
LDEV format of the HDP-VOL is performed with 0 data
writing.
Notes:
1. The mode is applied from factory shipment.
2. Do not change the setting of the mode during DP-VOL
format.
3. If the setting of the mode is changed during DP-VOL
format, the change is not reflected to the format of the DP-
VOL being executed but the format continues in the same
method.
ON
896
The mode enables or disables the background format
function performed on an unformatted area of a DP/DT/TI*1
pool.
*1: The background format function for a TI pool is only
available for V01+1 (73-01-31-00/00) or higher.
ON
70
System option modes
Hitachi Virtual Storage Platform G400, G600 Hardware Reference Guide
Summary of Contents for Virtual Storage Platform G400
Page 1: ...Hitachi Virtual Storage Platform G600 Hardware Reference Guide MK 94HM8022 05 June 2016 G400 ...
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 ...
Page 123: ...Hitachi Virtual Storage Platform G400 G600 Hardware Reference Guide ...