HP XP P9500 Storage - Manual (Page 45)

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Continuous Access Synchronous pair status is reported to the host if you query the Continuous
Access Synchronous P-VOL or S-VOL. To obtain the Business Copy pair status, query the
Business Copy P-VOL pair.
•
Business Copy 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 associated with a Business Copy P-VOL.
The following table shows when data is current on a shared Continuous Access
Synchronous/Business Copy volume based on the pair statuses.
Business Copy pair status Continuous
Access
Synchronous
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)
Continuous Access Journal
Continuous Access Synchronous and Continuous Access Journal (Cnt Ac-J) can share the same
pair volumes. Using a combined Cnt Ac-S and CAJ configuration can extend disaster recovery
options to a third data center.
Like Cnt Ac-S, a CAJ pair maintains a copy of the production volume in a second location. However,
unlike Cnt Ac-S, CAJ S-VOL is asynchronous, and the secondary system can be located much
greater distances from the local and remote Cnt Ac-S sites.
Creating both a Cnt Ac-S and a CAJ ensures that a copy in a third location is available in the
event that the primary site or one of the systems fails.
Configurations consisting of Cnt Ac-S and CAJ pair volumes are covered extensively in the HP XP
P9000 Continuous Access Journal User Guide.
Virtual LVI/LUN
Virtual LVI/LUN volumes can be assigned to Cnt Ac-S pairs, with the following restrictions:
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The S-VOL must have the same capacity as the P-VOL.
•
When performing Virtual LVI/LUN operations on an existing Cnt Ac-S P-VOL or S-VOL, you
must release the pair first to return the volume to SMPL status.
For more information, see the HP XP P9000 Provisioning for Open Systems User Guide.
Continuous Access Journal 45