HP XP7 Storage - Manual (Page 41)

Figure notes:
•
RAID Manager manages the consistency group on all primary and secondary system. Business
Continuity Manager cannot be used with multiple systems.
•
Open and mainframe primary volumes (P-VOLs/P-VOLs) receive I/O requests from their
applications at the primary (main) site, and data in the volumes is updated.
•
Continuous Access Synchronous or Continuous Access Synchronous Z runs the copy operation
in the consistency group.
•
When the open or mainframe host system guarantees the update order, then data consistency
in P-VOLs and S-VOLs is insured. When the host system does not guarantee update order,
data consistency is not insured.
Consistency group requirements
Requirements are provided for the following consistency group (CTG) configurations.
•
“Consistency group for pairs in one primary and one secondary XP7” (page 40)
•
“Consistency group for pairs in multiple primary and secondary systems” (page 40)
Requirements for a CTG for one primary and one secondary system
•
A consistency group is configured on the primary and secondary system.
•
A maximum of 8,192 pairs can be assigned to a consistency group.
•
A maximum of 256 consistency groups can be assigned to one primary and one secondary
system.
•
Assign a consistency group number in a range from 00-FF. The number must be unused.
•
When you have multiple pairs in the same consistency group, they must exist between the
same primary and secondary system.
•
A pair can be assigned to one consistency group only.
•
Continuous Access Synchronous pairs can be in the same consistency group as Continuous
Access Synchronous Z pairs. Use the same consistency group number for both types.
Consistency group planning 41