Hitachi ShadowImage for IBM z/OS User"s Guide (T5213-96002, June 2007)

2-20 About ShadowImage™ for IBM

z/OS

Operations

Hitachi ShadowImage™ for IBM

z/OS

User’s Guide

ShadowImage for z/OS has another option called the Host I/O Performance

option, which maintains host I/O performance (response). Host I/O

Performance option suppresses SIz copy operation regardless of the status of

the storage system. On the other hand, the Copy Threshold option is effective

only when the load of the storage system is heavy. When the Copy Threshold

option is in effect, all the SIz copy operations stop.

For information about the setting of the Host I/O Performance option, see

section Host I/O Performance Option. For information about the setting of the

Copy Threshold option, please call the Support Center.

Note: Copy operations that are stopped by the Copy Threshold option will

resume when the load of the storage system become light. If this option is in

effect, not only SIz copy operation but also the copy operations of the

following program products will stop when the load of the storage system is

heavy.

– ShadowImage

– Compatible Mirroring for IBM FlashCopy Version 1

– Compatible Mirroring for IBM FlashCopy Version 2

– Copy-on-Write Snapshot

– Volume Migration

Interoperability with other Products and Functions

ShadowImage for z/OS supports concurrent operations with the following data

management functions.

• Virtual LVI (see section Virtual LVI)

• Cache Residency Manager for IBM

z/OS

(see section Cache Residency

Manager)

• Volume Security (see section Volume Security)

• Volume Retention Manager (see section Volume Retention Manager)

• Volume Migration (see section Volume Migration)

• Universal Volume Manager (see section Universal Volume Manager)

• TrueCopy for z/OS (see section TrueCopy for z/OS)

• Universal Replicator for z/OS (see section Universal Replicator for z/OS)

• TrueCopy for z/OS and Universal Replicator for z/OS (see section TrueCopy

for z/OS and Universal Replicator for z/OS)

• Concurrent Copy (see section Concurrent Copy)