Method, system and program product for logically disconnecting in fibre channel communication without closing the exchange
First Claim
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1. A method f or logically disconnecting without closing an exchange pair in a fibre channel connection, the method comprising the steps of:
- a) transmitting a status information unit from a control unit to a channel, the status information indicating the control unit is logically disconnecting from the channel and the channel can elect to close the exchange;
b) receiving a status accepted information unit from the channel by the control unit, the status accepted information unit indicating the outbound exchange status; and
c) transmitting a device acknowledgment information unit from the control unit to the channel.
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Abstract
The present invention provides fiber channel networks the ability to logically disconnect without closing an exchange pair wherein the control unit signals the channel that the channel can elect to keep the exchange open by sending the channel a status command. A preferred status command to permit the channel to keep the exchange open includes an End Connection=‘0’ with Channel End=‘1’ and device end=‘0’.
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Citations
36 Claims
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1. A method f or logically disconnecting without closing an exchange pair in a fibre channel connection, the method comprising the steps of:
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a) transmitting a status information unit from a control unit to a channel, the status information indicating the control unit is logically disconnecting from the channel and the channel can elect to close the exchange;
b) receiving a status accepted information unit from the channel by the control unit, the status accepted information unit indicating the outbound exchange status; and
c) transmitting a device acknowledgment information unit from the control unit to the channel. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method to logically disconnect without closing an exchange pair in a fibre channel connection, the method comprising the steps of:
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a) receiving a status information unit from a control unit by a channel, the status information indicating the control unit is logically disconnecting from the channel and the channel can elect to close the exchange;
b) transmitting a status accepted information unit from the channel to the control unit indicating the outbound exchange status;
c) receiving a device acknowledgment information unit from the control unit to the channel. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A system for logically disconnecting without closing an exchange pair in a fibre channel connection, the system comprising:
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a control unit transmitter, transmitting a status information unit and device acknowledgment information unit to a channel, the status information indicating the control unit is logically disconnecting from the channel and the channel can elect to close the exchange; and
a control unit receiver, receiving a status accepted information unit from the channel, the status accepted information unit indicating the outbound exchange status. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A system to logically disconnect without closing an exchange pair in a fibre channel connection, the system comprising:
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a channel receiver, receiving a status information unit and a device acknowledgment information unit from a control unit, the status information indicating the control unit is logically disconnecting from the channel and the channel can elect to close the exchange; and
a channel transmitter, transmitting a status accepted information unit to the control unit indicating the outbound exchange status. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A computer program product comprising a computer useable medium having compute readable program code means therein in a computing system for logically disconnecting without closing an exchange pair in a fibre channel connection, the computer readable program code means in said computer program product comprising:
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a) computer readable program code means for transmitting a status information unit from a control unit to a channel, the status information indicating the control unit is logically disconnecting from the channel and the channel can elect to close the exchange;
b) computer readable program code means for receiving a status accepted information unit from the channel by the control unit, the status accepted information unit indicating the outbound exchange status; and
c) computer readable program code means for transmitting a device acknowledgment information unit from the control unit to the channel. - View Dependent Claims (26, 27, 28, 29, 30)
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31. A computer program product comprising a computer useable medium having compute readable program code means therein in a computing system to logically disconnect without closing an exchange pair in a fibre channel connection, the computer readable program code means in said computer program product comprising:
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a) computer readable program code means for receiving a status information unit from a control unit by a channel, the status information indicating the control unit is logically disconnecting from the channel and the channel can elect to close the exchange;
b) computer readable program code means for transmitting a status accepted information unit from the channel to the control unit indicating the outbound exchange status;
c) computer readable program code means for receiving a device acknowledgment information unit from the control unit to the channel. - View Dependent Claims (32, 33, 34, 35, 36)
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Specification