System option mode 900 is OFF: I/O synchronous copy
starts when the threshold of Volume Migration retry is
exceeded. (Recommended).
Mode 899 = OFF:
System option mode 900 is ON: I/O synchronous copy
starts when the number of retries reaches half of the
threshold of Volume Migration retry.
System option mode 900 is OFF: Volume Migration is retired
and I/O synchronous copy is not executed.
Notes:
1. This mode is applied when improvement of Volume
Migration success rate is desired under the condition that
there are many updates to a migration source volume of
Volume Migration.
2. During I/O synchronous copy, host I/O performance
degrades.
900
In combination with system option mode 899 setting,
whether to execute and when to start the I/O synchronous
copy change as follows.
Mode 900 = ON:
System option mode 899 is ON: I/O synchronous copy
starts without retrying Volume Migration.
System option mode 899 is OFF: I/O synchronous copy
starts when the number of retries reaches half of the
threshold of Volume Migration retry.
Mode 900 = OFF:
System option mode 899 is ON: I/O synchronous copy
starts when the threshold of Volume Migration retry is
exceeded. (Recommended)
System option mode 899 is OFF: Volume Migration is retired
and I/O synchronous copy is not executed.
Notes:
1. This mode is applied when improvement of Volume
Migration success rate is desired under the condition that
there are many updates to a migration source volume of
Volume Migration.
2. During I/O synchronous copy, host I/O performance
degrades.
OFF
901
By setting the mode to ON or OFF, the page allocation
method of Tier Level ALL when the drive type of tier1 is SSD
changes as follows.
Mode 901 = ON:
For tier1 (drive type is SSD), pages are allocated until the
capacity reaches the limit.
OFF
System option modes 77
Hitachi Virtual Storage Platform G800 Hardware Reference Guide
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