Mode Category Description Default MCU/RCU
Volume Migration
Universal Volume
Manager
is provided to prevent the percentage from exceeding 60%,
so that the host performance is not affected.
• SI
• Snapshot
• UVM
• Volume Migration
Mode 467 = ON (default): Copy overload prevention. Copy
processing stops when the percentage of “dirty” data reaches
60% or higher. When the percentage falls below 60%, copy
processing restarts.
Mode 467 = OFF: Normal operation. The copy processing
slows down if the dirty percentage is 60% or larger, and it
stops if the dirty percentage is 75% or larger.
Caution: This SOM must always be set to ON when using an
external volume as the secondary volume of any of the
applicable replication products.
Notes:
1. It takes longer to finish the copy processing because it
stops for prioritizing the host I/O performance.
2. This SOM supports background copy only. The
processing to copy the pre-update data to the S-VOL,
which occurs when overwriting data to uncopied slots of
P-VOL in Split processing or reading or writing data to
uncopied slots of S-VOL, is not supported.
3. Check the write pending rate of each CLPR per MP
blade. Even though there is some free cache capacity in
the entire system, if the write pending rate of an MP
blade to which pairs* belong exceeds the threshold, the
copy operation is stopped.
*Applies to pairs of SI, SIz, FCv2, FCSE, Snapshot, and
Volume Migration.
471
Thin Image Since the SIM-RCs generated when the Thin Image pool
usage rate exceeds the threshold value can be resolved by
users, these SIM-RCs are not reported to the maintenance
personnel. This SOM is used to report these SIM-RCs to
maintenance personnel.
The SIM-RCs reported by setting the SOM to ON are: 601xxx
(Pool utilization threshold exceeded), 603000 (SM space
warning).
Mode 471 = ON: These SIM-RCs are reported to
maintenance personnel.
Mode 471 = OFF: These SIM-RCs are not reported to
maintenance personnel.
Note: Set this SOM to ON when it is required to inform
maintenance personnel of these SIM-RCs.
OFF -
474 Universal
Replicator
UR initial copy performance can be improved by issuing a
command from CCIto execute a dedicated script consisting of
UR initial copy (Nocopy), UR suspend, TC Sync initial copy, TC
Sync delete, and UR resync.
OFF Both
358 System option modes
System Administrator Guide for VSP Gx00 models and VSP Fx00 models
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