Mode Category Description Default
MCU/R
CU
FlashCopy®
V2, Snapshot,
Volume
Migration,
Universal
Volume
Manager
higher, and it stops when the percentage is 75% or
higher. Mode 467 is provided to prevent the percentage
from exceeding 60%, so that the host performance is not
affected.
ShadowImage, , Compatible FlashCopy® V2, Snapshot,
Volume Migration, Universal Volume Manager
Mode 467 = ON: 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 mode must always be set to ON when using
an external volume as the secondary volume of any of the
above-mentioned replication products.
Note: It takes longer to finish the copy processing
because it stops for prioritizing the host I/O performance.
471 Copy-on-Write
Snapshot
(Earlier than
70-05-0x-00/0
0)
Copy-on-Write
Snapshot,
Hitachi Thin
Image
(70-05-0x-00/0
0 or higher)
Since the SIM-RC 601xxx that are generated when the
usage rate of Pool used by Snapshot exceeds the
threshold value can be resolved by users, basically they
are not reported to the maintenance personnel.This option
is used to inform maintenance personnel of these SIMs
that are basically not reported to maintenance personnel
in case these SIMs must be reported to them.
SIMs reported by setting the mode to ON are:
• SIM-RC 601xxx (Pool utilization threshold excess)
(Earlier than 70-05-0x-00/00)
• SIM-RC 601xxx (Pool utilization threshold excess)/
603000 (SM Space Warning) (70-05-0x-00/00 or
higher:)
Mode 471 = ON:This kind of SIMs is reported to
maintenance personnel.Mode 471 = OFF (default):This
kind of SIMs is not reported to maintenance
personnel.Note:Set this mode to ON when it is required to
inform maintenance personnel of the SIM-RC(*)
SIMs reported by setting the mode to ON are:
• SIM-RC 601xxx (Pool utilization threshold excess)
(Earlier than 70-05-0x-00/00)
• SIM-RC 601xxx (Pool utilization threshold excess)/
603000 (SM Space Warning) (70-05-0x-00/00 or
higher:)
OFF
474 Universal
Replicator
UR initial copy performance can be improved by issuing a
command from CCI/SI Manager to execute a dedicated
script consists of UR initial copy (Nocopy), UR suspend, TC
(Sync) initial copy, TC (Sync) delete, and UR resync.Mode
474 = ON:For a suspended UR pair, a TC-Sync pair can be
created with the same P-VOL/S-VOL so that UR initial
copy time can be reduced by using the dedicated
script.Mode 474 = OFF (default):For a suspended UR pair,
a TC-Sync pair cannot be created with the same P-VOL/S-
OFF MCU/RC
U
B-6
System option modes
Hitachi Unified Storage VM Block Module Hardware User Guide
To Next Page
Loading...
