Table 40 SRDF multi-site solutions (continued)
Solution highlights Site topology
See: SRDF/AR on page 160.
Concurrent SRDF
3-site disaster recovery and
advanced multi-site business
continuity protection.
l
Data on the primary site is
concurrently replicated to 2
secondary sites.
l
Replication to remote site can
use SRDF/S, SRDF/A, or
adaptive copy
See: Concurrent SRDF solutions on
page 107.
Site A
SRDF/S
adaptive copy
Site C
Site B
R2
R11
R2
Cascaded SRDF
3-site disaster recovery and
advanced multi-site business
continuity protection.
l
Data on the primary site is
synchronously mirrored to a
secondary (R21) site, and then
asynchronously mirrored from
the secondary (R21) site to a
tertiary (R2) site.
l
First “hop” is SRDF/S. Second
hop is SRDF/A.
See: Cascaded SRDF solutions on
page 108.
Site A Site C
Site B
SRDF/S
SRDF/A
R1
R2
R21
SRDF/Star
3-site data protection and disaster
recovery with zero data loss
recovery, business continuity
protection and disaster-restart.
l
Available in 2 configurations:
n
Cascaded SRDF/Star
n
Concurrent SRDF/Star
l
Differential synchronization
allows rapid reestablishment of
mirroring among surviving sites
in a multi-site disaster
recovery implementation.
l
Implemented using SRDF
consistency groups (CG) with
SRDF/S and SRDF/A.
Site A
SRDF/S
SRDF/A
SRDF/A (recovery)
R11
Site C
Site B
Cascaded SRDF/Star
Concurrent SRDF/Star
Site A
SRDF/S
SRDF/A Site C
Site B
SRDF/A
(recovery)
R11
R2/
R22
R2/
R22
R21
R21
Remote replication solutions
106 Product Guide VMAX 100K, VMAX 200K, VMAX 400K with HYPERMAX OS
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