| 摘要 |
A processor-based system ( 200 ) with a multipath I/O architecture, including a virtual host controller interface (vHCI) layer ( 280 ) between a common architecture layer ( 270 ) and a physical host controller interface layer ( 290 ), which may include convential host bus adapters (HBAs) coupled to target decives such as storage devices ( 240, 250 ) in a storage area network (SAN). Target drivers send I/O requests to a common architecture layer, which forwards them to the vHCI layer ( 280 ), which then sends them to HBAs for sending to the target devices ( 240, 250 ). A multipathing driver interface (MPXIO) layer ( 310 ) resides beneath the vHCI layer ( 280 ), and determines target device path information for the vHCI layer ( 280 ). Positioning the MPXIO layer ( 310 ) beneath the vHCI layer avoids the need for multipathing target drivers ( 360 ) above the common architecture layer. A failover operations module may be provided for each type of target device to provide the vHCI layer ( 280 ) with failover protocol information in the event of a failed path.
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