Mode
Category
Description
Default
MCU/RCU
704
ShadowImage
Volume
Migration
To reduce the chance of MIH, this SOM can reduce
the priority of ShadowImage, Volume Migration, or
Resync copy internal IO requests so that host IO has
a higher priority. This SOM creates new work queues
where these jobs can be assigned with a lower
priority.
Mode 704 = ON:
Copy processing requested is
registered into a newly created queue so that the
processing is scheduled with lower priority than host
I/O.
Mode 704 = OFF (default):
Copy processing
requested is not registered into a newly created
queue. Only the existing queue is used.
Notes:
1.
Apply this SOM when the load of host I/O to an
ECC that uses ShadowImage or Volume
Migration is high and the host I/O processing is
delayed.
2.
If the PDEV is highly loaded, the priority of Read/
Write processing made by ShadowImage,
Volume Migration, or Resync may become
lower. As a consequence the copy speed may be
slower.
OFF
-
System option modes
Appendix B: System option modes
System Administrator Guide for VSP Gx00 models and VSP Fx00 models
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