Mode Category Description Default MCU/RCU
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.
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 fixed, 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 fixed (current spec).
OFF -
466 Universal
Replicator
It is strongly recommended that the path between the
primary and secondary storage systems have a minimum
data transfer speed of 100 Mbps. If the data transfer speed
falls to 10 Mbps or lower, UR operations cannot be properly
processed. As a result, many retries occur and UR pairs
might be suspended. This SOM is provided to ensure proper
system operation for data transfer speeds of at least 10
Mbps.
Mode 466 = ON: Data transfer speeds of 10 Mbps and
higher are supported. The JNL read is performed with 4-
multiplexed read size of 256 KB.
Mode 466 = OFF (default): For conventional operations.
Data transfer speeds of 100 Mbps and higher are supported.
The JNL read is performed with 32-multiplexed read size of 1
MB by default.
Note: The data transfer speed can be changed using the
Change JNL Group options.
OFF -
467 ShadowImage
Snapshot
For the following features, the current copy processing slows
down when the percentage of “dirty” data is 60% or higher,
and it stops when the percentage is 75% or higher. Mode 467
ON -
System option modes 357
System Administrator Guide for VSP Gx00 models and VSP Fx00 models
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