Mode Category Description Default MCU/RCU
457 Universal
V
olume
Manager
This SOM has two purposes: High-Speed LDEV
Format for External Volumes, and Support for
Mainframe Control Block Write GUI.
Mode 457 = ON:
1. High-Speed LDEV Format for External Volumes.
The high-speed LDEV format for external
volumes is available by SOM 457 to ON. When
SOM 457 is ON, if you select an external volume
group and perform an LDEV format, any write
processing on the external logical units will be
skipped. However, if the external LDEV is a
mainframe volume, the write processing for
mainframe control information only will be
performed after the write skip.
2. Support for Mainframe Control Block Write GUI.
Control Block Write of the external LDEVs in
mainframe emulation is supported by Device
Manager - Storage Navigator (GUI).
■ If the LDEV is not written with data “0” before
performing the function, the LDEV format
might fail.
■ After the format processing, make sure to set
SOM 457 to OFF.
Mode 457 = OFF (default): High-speed LDEV format
for external volumes and support for mainframe
control block write GUI are not available.
OFF Both
459 ShadowImage When the S-VOL of an SI/SIz pair is an external
volume, the transaction to change the status from
SP-PEND to SPLIT is as follows:
Mode 459 = ON: When suspending an SI pair: The
copy data is created in cache memory. When the
write processing on the external storage completes
and the data is xed, the pair status will change to
SPLIT.
Mode 459 = OFF (default): When suspending an SI
pair: Once the copy data has been created in cache
memory, the pair status will change to SPLIT. The
external storage data is not xed (current spec).
OFF -
System option modes
Appendix B: System option modes
System Administrator Guide for VSP Gx00 models and VSP Fx00 models 297
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