Hitachi ShadowImage for z/OS user guide (HIT9503-96009, January 2008)

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Table 5 Reverse or Quick Restore Pairresync Requirements

Parameter

Requirement(s)

Pair status

The speciﬁed pair must be in the split state. All other

pairs that share the same S-VOL as the speciﬁed pair

must also be in the split or suspended state.

Pair type

Youcannotperformthequickrestorepairresync

command on a pair that consists of VLL and normal

volumes. The speciﬁed pair must NOT be a Data

Exchange volume pair.

Shared Siz/TCz volume

If the Siz and TCz pairs* share the same volume

(S-VOL = M-VOL, T-VOL = M-VOL, or S-VOL = R-VOL),

andtheTrueCopyforz/OSpairisnotinthesuspend

status, the reverse copy and quick restore operations

cannot be performed.

Shared Siz/

URz volume

If the Siz and URz pairs* share the same volume,

and the URz pair is not in the suspend status, the

reverse copy and quick restore operations cannot be

performed.

*Duringthereversecopyorquickrestoreoperation,aTCzpairnoraURzcannotbecreated.TheTCzadd

pair command and URz add pair command is rejected when the Siz pair status is resync-r. When the

shared Siz/TCz volume is paired with an external volume the quick restore pair-resync operation cannot be

performed. When the shared Siz/URz volume is paired with an external volume the quick restore pair-resync

operation cannot be performed.

Cautions

• When a re

verse or quick restore resync operation ends abnormally, or a Suspend pair is

requested during reverse copy or quick restore, the pair status changes to suspended.TheS-VOL

of the suspended pair is read/write-enabled for all hosts; however, the data on the S-VOL is not

guaranteed. The T-VOL of the suspended pair remains read/write-disabled.

• If a rev

erse or quick restore resync operation ends abnormally, or a Suspend pair is requested

during reverse copy or quick restore, the status of other Siz pairs which share the same S-VOL

does not change.

• If the r

everse copy or quick restore operation is performed on one Siz pair in a 1-to-n conﬁguration

(n>1), the S-VOL and the other T-VOLs are no longer synchronized.

NOTE:

During reverse copy or quick restore is in progress, you cannot perform add, split, or resync pair for any

other

pair that shares the same S-VOL (delete pair and suspend pair are allowed).

The colored volume means that it is an internal volume, and the volume without color means that it

is an external volume.

NOTE:

A primary volume (P-VOL) of URz means a primary data volume of URz. A secondary volume (S-VOL)

of URz means a secondary data volume of URz.

Overview of Hitachi ShadowImage for z/OS Operations