410SAN Multiprotocol Routing: An Introduction and Implementation
Using iFCP fast write
The fast write mechanism is an attempt to mitigate the transport latency
associated with long-distance SCSI I/O operations. Fast write performance
depends heavily on the traffic profile of the SCSI operations being performed.
The following I/O characteristics are well-suited to benefit from fast write:
Long-distance, high-latency network
Write intensive I/O
High number of small SCSI writes (rather than low number of large writes)
Disk system with low write latency
These characteristics suggest that the best use for fast write is in disk system
replication. ...
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