1. This mode is applied when
- Dynamic Tiering for Mainframe is used (including multi
platforms configuration).
- the requirement for response time is severe.
2. The number of pages to be migrated per unit time at tier
relocation decreases.
908
The mode can change CM capacity allocated to MPBs with
different workload.
Mode 908 = ON:
Difference in CM allocation capacity among MPBs with
different workload is large.
Mode 908 = OFF:
Difference in CM allocation capacity among MPBs with
different workload is small. (Existing operation)
Notes:
1. If a CLPR is used by only some MPBs among all the
installed MPBs, set the mode to ON for the CLPR to increase
CM capacity allocated to the MPBs that use the CLPR.
Example:
(a) A CLPR only for UR JNLG
(b) A configuration where MPBs and CLPRs are separately
used for Open and Mainframe systems.
2. Since CM capacity allocated to MPBs with low load is
small, the performance is affected by a sudden increase in
load.
3. System option mode 908 cannot be used with system
option mode 933. When system option mode 933 is set to
ON, the function of system option mode 908 is canceled
even though system option mode 908 is ON.
4. This mode is effective for a CLPR. Therefore, when
setting the mode to ON/OFF, select target "LPRXX (XX=00
to 31)". For example, even when CLPR0 is defined (any of
CLPR1 to 31 are not defined), select “LPR00” first and then
set the mode to ON/OFF.
OFF
930
When the mode is set to ON, all of the zero data page
reclamation operations in processing are stopped. (Also the
zero data page reclamation cannot be started.)
* Zero data page reclamation by WriteSame and UNMAP
functions, and IO synchronous page reclamation are not
disabled.
Mode 930 = ON:
All of the zero data page reclamation operations in
processing are stopped at once. (Also the zero data
reclamation cannot be newly started.)
Mode 930 = OFF:
OFF
System option modes
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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 ...