Table 40 SRDF multi-site solutions (continued)
Solution highlights Site topology
See: SRDF/Star solutions on page
109.
Concurrent SRDF solutions
Concurrent SRDF is a 3-site disaster recovery solution using R11 devices that replicate
to two R2 devices. The two R2 devices operate independently but concurrently using
any combination of SRDF modes:
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Concurrent SRDF/S to both R2 devices if the R11 site is within synchronous
distance of the two R2 sites.
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Concurrent SRDF/A to sites located at extended distances from the workload site.
You can restore the R11 device from either of the R2 devices. You can restore both the
R11 and one R2 device from the second R2 device.
Use concurrent SRDF to replace an existing R11 or R2 device with a new device. To
replace an R11 or R2, migrate data from the existing device to a new device using
adaptive copy disk mode, and then replace the existing device with the newly
populated device.
Concurrent SRDF can be implemented with SRDF/Star. SRDF/Star solutions on page
109 describes concurrent SRDF/Star.
Concurrent SRDF topologies are supported on Fibre Channel and Gigabit Ethernet.
The following image shows:
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The R11 -> R2 in Site B in synchronous mode.
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The R11 -> R2 in Site C in adaptive copy mode:
Remote replication solutions
Concurrent SRDF solutions 107
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