| PRIMECLUSTER Global Link Services Configuration and Administration Guide: Multipath Function (for Solaris(TM) Operating Environment) |
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Contents
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| Chapter 2 Capabilities | > 2.1 Outline of Functions |
Each used communication path has the state (status) for the switching operation. The state transition of the communication path is explained in "Figure 2.5 State Transition of Communication Path." The meaning of those states is shown in "Table 2.1 Description of the state of communication path."
It is possible to refer to the state of the communication path only when it was able to activate normally. Refer to Subsection "6.3.2.1 info subcommand" or "6.3.2.2 status subcommand" of "6.3 Multipath control command" for the method of monitoring the state of the communication path.
Moreover, refer to "6.3 Multipath control command" for the subcommand used for the state transition.
Refer to "Chapter 8 Dynamic Reconfiguration Function" for the Dynamic Reconfiguration function.
[Figure 2.5 State Transition of a Communication Path]
[Table 2.1 Descriptions of the states of communication paths]
State
Description
active
Communicating/Ready to communicate
standby
Ready to communicate but the standby state
stop
Stopped
fail
Disabled due to error detection
disconnected
Disconnected state
busy
Processing
When status of the communication path is displayed, the online NIC shows "active" state. When switching the online NIC, the driver software searches the standby NIC, and the MAC address configured by the environmental setting is taken over to the standby NIC.
Upon detection of an error, console messages are output from the driver software and the transmission path monitoring daemon.
The online NIC changes from "active" state to "fail" state to switch to the standby NIC. The standby NIC changes from "standby" state to "active" state to continue communicating with the remote system.
The "standby NIC" is changed from "standby" state into "active" state by executing "active subcommand", and communication is continued.
At this time, the online NIC in "active" state changes to "standby" state.
And, "standby" state changes from "fail" state in executing "recover subcommand" and "start subcommand", and can be reused as the standby NIC.
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