Pair status and data currency – HP XP7 Storage User Manual

Page 139

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Figure 22 Shared Cnt Ac-J volumes with BC primary volumes

Configurations with Business Copy secondary volumes

The following figure shows a BC primary volume used as the production volume. A remote Cnt
Ac-J backup copy is made of the BC secondary volume. The BC pair must be in PSUS status to
perform the Cnt Ac-J operation.

Figure 23 Shared Cnt Ac-J P-VOL with BC secondary volume

Pair status and data currency

The table below shows whether the data in a shared volume is current, given the combined status.

BC pair status

Cnt Ac-J pair
status

PSUE

COPY(RS/COPY,
COPY(RS-R)/COPY

PSUS

COPY(SP)/COPY

PAIR

COPY(PD)/COPY

Not Current

Not Current

Current

Not Current

Not Current

Not Current

COPY

Not Current

Not Current

Current

Not Current

Not Current

Not Current

PAIR

Not Current

Current

Current

Current

Current

Not Current

PSUS/PSUE

Check pair status for shared volumes as follows:

For Cnt Ac-J, check status of the primary volume or secondary volume.

For BC, check status of the primary volume.

BC supports multiple secondary volumes for each primary volume. When you check pair status,
the system returns status for only one pair—the pair whose secondary volume has the lowest LDEV
ID. To see status for the pairs with a different secondary volume, direct a host query to the specific
secondary volume using the secondary volume’s LDEV ID in the host command.

Configurations with Business Copy secondary volumes

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