Table 39 SRDF 2-site solutions (continued)
Solution highlights Site topology
l
Once data is written to cache in Site B, the
SRDF emulation in Site B returns a positive
acknowledgment to Site A
Operating Notes:
l
The maximum skew value set at the device level
in SRDF/DM solutions must be equal or greater
than 100 tracks
l
SRDF/DM is only for data replication or
migration, not for disaster restart solutions
See: Adaptive copy modes on page 123.
Data may be read from the drives to cache before it is transmitted
across the SRDF links, resulting in propagation delays.
SRDF/Automated Replication (SRDF/AR)
l
Combines SRDF and TimeFinder to optimize
bandwidth requirements and provide a long-
distance disaster restart solution.
l
Operates in 2-site solutions that use SRDF/DM
in combination with TimeFinder.
See: SRDF/AR on page 160.
Site A
Host
Site B
R1
R2
TimeFinder
TimeFinder
SRDF
background copy
Host
SRDF/Cluster Enabler (CE)
l
Integrates SRDF/S or SRDF/A with Microsoft
Failover Clusters (MSCS) to automate or semi-
automate site failover.
l
Complete solution for restarting operations in
cluster environments (MSCS with Microsoft
Failover Clusters)
l
Expands the range of cluster storage and
management capabilities while ensuring full
protection of the SRDF remote replication.
For more information, see
EMC SRDF/Cluster
Enabler Plug-in Product Guide
.
Site A Site B
SRDF/S or SRDF/A links
Fibre Channel
hub/switch
Fibre Channel
hub/switch
VLAN switch
VLAN switch
Extended IP subnet
Cluster 1
Host 2
Cluster 2
Host 1
Cluster 2
Host 2
Cluster 1
Host 1
SRDF-2node2cluster.eps
Remote replication solutions
104 Product Guide VMAX 100K, VMAX 200K, VMAX 400K with HYPERMAX OS
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