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P-VOL_PSUS from/to S-VOL_SSUS(WE)T2: P-VOL_PSUS from/to S-VOL_SSUS(WE)

• If you attempt the pairevtwait -s psus in P-VOL_PSUS & S-VOL_COPY state, then pairevtwait

will return immediately even if the S-VOL is still in S-VOL_COPY state because P-VOL is already

in P-VOL_PSUS state. If you want to wait the “S-VOL_SSUS” state, and then you must check

the status of the S-VOL becomes “S-VOL_PSUS” via the return code using pairvolchk -ss

command on S-VOL side or pairvolchk -ss -c command on P-VOL side. Or you can use

pairevtwait -ss ssus on both P-VOL and S-VOL, pairevtwait -ss ssus -l on S-VOL locally.

• If you attempt the pairresync -restore or pairsplit -S in P-VOL_PSUS & S-VOL_COPY state, then

Business Copy will reject this command due to unable to perform. In this case, you need to

wait until the S-VO state becomes S-VOL_SSUS.

Table 30 Pair status versus Snapshot commands

Snapshot CommandPair Status

pairresyncpairsplitpaircreate

Resync-S option-C option-E option-splitNo -split

RejectedAcceptableRejectedRejectedRejectedAccepted 2SMPL1

AcceptableRejectedRejectedRejectedRejectedAcceptableCOPY

RCPY

AcceptableAccepted 1Accepted 4RejectedAccepted*4AcceptablePAIR3

Accepted* 2Accepted 1AcceptableRejectedAcceptableRejectedPSUS

(PFUS)

Accepted* 2Accepted 1RejectedAcceptableRejectedRejectedPSUE5

Accepted*: A command is accepted and issued; whether this command is executed or not depends

on the microcode version of the RAID storage system.

NOTE:

• pairsplit (“simplex -S”) of Snapshot volume is returned without verification of state transition

that waits until SMPL state. In SMPL state, the volume that was S-VOL becomes R/W disable

and data is discarded.

• In the “PSUE” state, Snapshot does not manage for differential data between the primary

volume and secondary volume.

Continuous Access Asynchronous, Continuous Access Synchronous, and Continuous

Access Journal volumes

Continuous Access Asynchronous/Continuous Access Journal provides paired volumes that use

asynchronous transfer to ensure the sequence of writing data between the primary volume and

secondary volume. The sequence of writing data between the primary and secondary volumes is

guaranteed within each consistency (CT) group (see Figure 54 (page 139)).

138 Data replication operations with RAID Manager

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