Automatic sharing of SCSI multiport device with standard command protocol in conjunction with offline signaling
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United States of America Patent
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Jan 30, 2001
Grant Date -
N/A
app pub date -
Oct 22, 1998
filing date -
Oct 22, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method, embodiable in computer readable program code, and a SCSI multiport device allow multiple hosts to be coupled to associated device ports of the multiport device. Using standard SCSI signaling, any host port may reserve the multiport device at its one associated device port. In response to a Reservation command, the multiport device is reserved in accordance with standard SCSI protocol. The method implements, at all the device ports other than the one device port, OFFLINE or status signaling which indicates that the multiport device is unavailable or offline. In response to a Device Reset from the one host port, the method operates the multiport device in accordance with standard SCSI protocol, including resetting the reservation of the multiport device, and additionally maintains the implemented OFFLINE or status signaling. Then, in response to a Release command from the one host port, the reservation of the multiport device is released in accordance with standard SCSI protocol, and additionally the OFFLINE or status signaling is terminated.
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