Controller-based bi-directional remote copy system with storage site failover capability
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United States of America Patent
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Nov 4, 2003
Grant Date -
N/A
app pub date -
Mar 30, 2000
filing date -
Mar 30, 2000
priority date (Note) -
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Abstract
A data replication system having a redundant configuration including dual Fiber Channel fabric links interconnecting each of the components of two data storage sites, wherein each site comprises a host computer and associated data storage array, with redundant array controllers and adapters. The system includes the capability of simultaneous bi-directional remote data replication which permits the system to operate in an `extended cluster` mode, as if each of the remote storage arrays were local relative to the respective remote host. The system further includes the concept of `home` and `alternate` storage nodes, which provide for automatic node failover from a primary to a designated alternate node, without necessitating re-booting of the remote node. Write data transfers are potentially host retry-able at both sites; upon failure of controllers at one site, the host re-issues the same write on other site.
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