User guide

ManualsBrandsReal Cable ManualsComputer equipmentHDS-12

100

System option modes B–7

Hitachi Unified Storage VM Block Module Hardware User Guide

467 ShadowImage,

,Compatible

FlashCopy®

V2, Snapshot,

Volume

Migration,

Universal

Volume

Manager

For the following features, the current copy processing

slows down when the percentage of “dirty” data is 60%

or 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/

00)

Copy-on-Write

Snapshot,

Hitachi Thin

Image

(70-05-0x-00/

00 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(*)