Remote copy system for setting request interconnect bit in each adapter within storage controller and initiating request connect frame in response to the setting bit
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United States of America Patent
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-
Oct 21, 1997
Grant Date -
N/A
app pub date -
Feb 28, 1995
filing date -
Feb 28, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A remote copy system incorporates dynamically modifiable ports on the storage controllers such that those ports can operate either as a control unit link-level facility or as a channel link-level facility. When configured as a channel link-level facility, a primary storage controller can appear as a host processor to a secondary storage controller. The primary storage controller can thereafter initiate multiple request connects (RQC) concurrently for servicing a single I/O request. In this manner, a first available path can be selected and system throughput thus improved since RQCs so not need to be sent serially from path to path looking for an available path.
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