Method and system for enhancing fibre channel loop resiliency for a mass storage enclosure by increasing component redundancy and using shunt elements and intelligent bypass management

Inactive Publication Date: 2002-01-24
WHITE JAMES L
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  • Abstract
  • Description
  • Claims
  • Application Information

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0100] Although the present invention has been described in terms of a particular embodiment, it is not intended that the invention be limited to this embodiment. Modifications within the spirit of the invention will be apparent to those skilled in the art. For example, the present invention may be practiced in multi-peripheral-device enclosures that use different inter and intra-enclosure communications media than the FC communications medium employed in the above-described embodiment. As another

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  • Method and system for enhancing fibre channel loop resiliency for a mass storage enclosure by increasing component redundancy and using shunt elements and intelligent bypass management
  • Method and system for enhancing fibre channel loop resiliency for a mass storage enclosure by increasing component redundancy and using shunt elements and intelligent bypass management
  • Method and system for enhancing fibre channel loop resiliency for a mass storage enclosure by increasing component redundancy and using shunt elements and intelligent bypass management

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Embodiment Construction

message 684 to the initiator. At this point, the I / O operation has been completed. The target device then drops the BSY signal line so that the SCSI bus returns to the BUS FREE state 686. The SCSI-bus adapter can now finish its portion of the I / O command, free up any internal resources that were allocated in order to execute the command, and return a completion message or status back to the CPU via the PCI bus.

MAPPING THE SCSI PROTOCOL ONTO FCP

[0056] FIGS. 7A and 7B illustrate a mapping of FCP sequences exchanged between an initiator and target and the SCSI bus phases and states described in FIGS. 6A-6C. In FIGS. 7A-7B, the target SCSI adapter is assumed to be packaged together with a FCP host adapter, so that the target SCSI adapter can communicate with the initiator via the FC and with a target SCSI device via the SCSI bus. FIG. 7A shows a mapping between FCP sequences and SCSI phases and states for a read I / O transaction. The transaction is initiated when the initiator sends a si...

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Abstract

A reliable and fault-tolerant multi-peripheral-device enclosure for use in high-availability computer systems. The reliable and fault-tolerant multi-peripheral-device enclosure uses a three-tiered port bypass control strategy for diagnosing and isolating malfunctioning peripheral devices within the multi-peripheral-device enclosure, and uses a similar a three-tiered port bypass control strategy for isolation of the entire multi-peripheral-device enclosure from a communications medium that interconnects the multi-peripheral-device enclosure with one or more host computers.

Description

[0001] The present invention relates to multi-peripheral-device enclosures, and, in particular, to a method and system for increasing the reliability and availability of multi-peripheral-device enclosures by incorporating control elements for isolating components.[0002] The fibre channel ("FC") is an architecture and protocol for a data communication network for interconnecting a number of different combinations of computers and peripheral devices. The FC supports a variety of upper-level protocols, including the small computer systems interface ("SCSI") protocol. A computer or peripheral device is linked to the network through an FC port and copper wires or optical fibres. An FC port includes a transceiver and an interface controller, and the computer peripheral device in which the FC port is contained is called a "host." The FC port exchanges data with the host via a local data bus, such as a peripheral computer interface ("PCI") bus. The interface controller conducts lower-level ...

Claims

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Application Information

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IPC IPC(8): G06F13/14G06F3/06G06F11/20G06F11/267
CPCG06F11/1662G06F11/2094G06F11/2221
Inventor WHITE, JAMES L.
Owner WHITE JAMES L
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