Figure 18 Concurrent SRDF topology
R11
R2
Synchronous
Adaptive copy
Site B Site A
Site C
Production host
R2
Concurrent SRDF/S with Enginuity Consistency Assist
If both legs of a concurrent SRDF configuration are SRDF/S, you can leverage the
independent consistency protection feature. This feature is based on Enginuity
Consistency Assist (ECA) and enables you to manage consistency on each concurrent
SRDF leg independently.
If consistency protection on one leg is suspended, consistency protection on the other
leg can remain active and continue protecting the primary site.
Cascaded SRDF solutions
Cascaded SRDF provides a zero data loss solution at long distances in the event that
the primary site is lost.
In cascaded SRDF configurations, data from a primary (R1) site is synchronously
mirrored to a secondary (R21) site, and then asynchronously mirrored from the
secondary (R21) site to a tertiary (R2) site.
Cascaded SRDF provides:
l
Fast recovery times at the tertiary site.
l
Tight integration with TimeFinder product family.
l
Geographically dispersed secondary and tertiary sites.
If the primary site fails, cascaded SRDF can continue mirroring, with minimal user
intervention, from the secondary site to the tertiary site. This enables a faster
recovery at the tertiary site.
Both the secondary and the tertiary site can be failover sites. Open systems solutions
typically fail over to the tertiary site.
Cascaded SRDF can be implemented with SRDF/Star. Cascaded SRDF/Star on page
111 describes cascaded SRDF/Star.
The following image shows a cascaded SRDF topology.
Remote replication solutions
108 Product Guide VMAX 100K, VMAX 200K, VMAX 400K with HYPERMAX OS
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