HP 3PAR Remote Copy Software - Manual (Page 37)

2.21 Remote Copy Operation
InForm OS Version 2.3.1 Remote Copy User’s Guide
For bidirectional configurations, both storage servers can hold primary and secondary volume
groups. For a bidirectional Remote Copy pair, each storage server provides backup for the
other, but only for the selected volume groups ( Figure 2-11 ).
Figure 2-11. Mapping of Volumes Between a Bidirectional Remote Copy Pair
NOTE: Although the benefits of using volume groups are considerable, one
drawback is that the I/O to all volumes in the group is blocked while taking
snapshots. If the number of volumes in the group is very large (the current
supported limit is 100 volumes per group), the blocking of the I/O might result in
some host writes timing out.
InServ1
InServ2
Volume Group X
Volume Group X.r
(Primary)
(Secondary)
A A B B C C
Volume Group Y.r
Volume Group Y
(Secondary)
(Primary)
D D E E F F
Group X Target: InServ2
Group X.r Target: InServ1
Group Y.r Target: InServ2
Group Y Target: InServ1
Direction of data
replication