HP XP Racks - Manual (Page 43)

Configurations with Business Copy S-VOLs
In the following figure, an BC S-VOL also functions as a Cnt Ac-S P-VOL. This configuration requires
that the BC pair is split before the Cnt Ac-S pair is created.
Figure 5 Shared BC S-VOL with Cnt Ac-S P-VOL
Status reporting and data currency
The following table shows the pair status that is reported for different combinations of shared
volumes.
Pair status Number of BC S-VOLs Number of Cnt
Ac-S pairs
SMPL 0 0
BC pair status 1 0
BC pair status for the S-VOL with lowest LDEV ID 2 or more 0
Cnt Ac-S pair status 0 1
Cnt Ac-S pair status 1 1
Cnt Ac-S pair status 2 or more 1
•
Cnt Ac-S pair status is reported to the host if you query the Cnt Ac-S P-VOL or S-VOL. To obtain
the BC pair status, query the BC P-VOL pair.
•
BC supports multiple S-VOLs for each of its P-VOLs, but when you issue a pair status query,
the status is returned only for the pair whose S-VOL has the lowest LUN. To check pair status
for the other S-VOLs, direct a host query to the specific S-VOL using the S-VOL's LUN in the
host command.
Remote Web Console displays the status of all S-VOLs.
The following table shows when data is current on a shared Cnt Ac-S/BC volume based on the
pair statuses.
BC pair status Cnt Ac-S pair
status
PSUE COPY (RS)/COPY,
COPY(RS-R)/RCPY 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 (Delete
pair to
RCU)/PSUE
(pair
suspended-error)
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