Bus controlling system
AssigneeHitachi, Ltd.
InventorsNobuyuki Saze, Atsushi Ishikawa, Tetsuzo Kobashi
Life of this patent
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Abstract
In a system including a plurality of rotatable media type memory devices and disk array storage including in a redundant configuration a plurality of controllers each including a disk array control unit in which a plurality of SCSI bus coupling ports are individually coupled with respective ports of a plurality of host PCs/WSs via SCSI cables, the disk array control unit includes a function to logically transmit a bus operation such as a device or bus reset operation in an arbitrary one of the ports of the disk array storage to other ports. This makes it possible that the ports seems to be physically coupled in a daisy chain when viewed from the host PCs/WSs.
Claims3
A bus controlling system comprising:
- a plurality of independent ports controlling information transfers under respective arbitrary bus protocols via respective bus interfaces, said ports being coupled to external information processing apparatuses via Small Computer System Interface (SCSI) buses;
- and
- a control unit controlling information transfers among said independent ports by forming logical connections between said independent ports,
- wherein said control unit monitors a state of said independent ports, determines whether or not a command received in one of said independent ports is to be relayed and transmits said command to another of said independent ports when the received command is to be relayed, and
- wherein said control unit analyzes operation of the SCSI bus of each of said independent ports and achieves a control such that said independent ports seem to be physically connected in a daisy chain.
Dependencies are inferred from the claim text.