TimeFinder and SRDF/S
SRDF/S solutions support any type of TimeFinder copy sessions running on R1 and R2
devices as long as the conditions described in R1 and R2 devices in TimeFinder
operations on page 160 are met.
SRDF and EMC FAST coordination
SRDF coordination instructs FAST (HYPERMAX OS) and FAST VP (Enginuity 5876)
to factor the R1 site statistics into the move decisions that are made at the R2 site.
This coordination feeds the I/O workload into the decisions made by the R2 side FAST
so that the R2 array can be optimized for all of its workloads.
FAST coordination requires that both arrays run the same operating environment code
family, either 5876 or 5977.
Reads are not propagated across the SRDF links, thus without SRDF/FAST
coordination for workloads with heavy read operations, the R2 side can be
substantially less busy than the R1 side.
You can enable coordination on both sides of the SRDF links in a 2-site and multi-site
SRDF topologies. FAST/SRDF coordination avoids the following scenarios:
l
In an SRDF failover, the remote array has different performance characteristics
than the local production array.
l
In SRDF/A configurations, FAST data movements on the R1 array result in an R2
device with lower performance characteristics than the performance of the R1
device.
Blended local and remote replication
TimeFinder and SRDF/S 163
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