Mode Category Description Default MCU/RCU
704 ShadowImage
V
olume
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 307
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