Connection apparatus for magnetic disk device
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United States of America Patent
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-
Dec 16, 1997
Grant Date -
N/A
app pub date -
Jun 24, 1996
filing date -
Jun 28, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A connection apparatus for a magnetic disk device is connected between a plurality of host devices and a plurality of drive devices and includes a plurality of bus connection control units respectively provided in correspondence with the host devices. Each of the bus connection control units includes a first protocol controller for individually communicating with one of the host devices by using a small computer system interface (SCSI) bus, a plurality of second protocol controllers for respectively communicating with the drive devices by using SCSI buses, a switching circuit for switching connection between the first protocol controller and the second protocol controllers, and a control circuit for, when a command including the logical unit number of a drive device is generated from one of the host devices, controlling the switching circuit in accordance with the logical unit number and switching the first protocol controller to one of the second protocol controllers regardless of another connection between the host device and the drive device. Each of the drive devices is respectively connected to the second protocol controllers corresponding to the bus connection control units via the common SCSI bus.
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