Hitachi VSP Gx00 series - Page 347

Mode Category Description Default MCU/RCU
1119 Deduplication
and
Compr
ession
This SOM is used to downgrade the microcode as
follows while capacity saving is enabled:
■
VSP Fx00 models, VSP Gx00 models: From
83-04-03-x0/00 or later to 83-04-01-x0/00 or
83-04-02-x0/00
New control information is added with 83-04-03 for
the inow control processing when capacity saving is
enabled. However, it must be guaranteed that the
area is not used when the microcode version is
83-04-01 or later. This SOM disables the control
information added with 83-04-21 when capacity
saving is enabled to enable microcode downgrade.
Mode 1119 = ON: The control information is not
used when capacity saving is enabled.
Mode 1119 = OFF (default): The control information
is used when capacity saving is enabled.
Notes:
1. Set this SOM to ON when the microcode
downgrade described above is performed, even
if capacity saving is not currently in use but has
been used before.
2. After the microcode downgrade is complete,
make sure to set this SOM to OFF.
3. This SOM is eective for the entire storage
system.
4. The write performance might degrade when this
SOM is ON.
OFF -
System option modes
Appendix B: System option modes
System Administrator Guide for VSP Gx00 models and VSP Fx00 models 347