CN101119187A - Master-salve equipment switch control method - Google Patents
Master-salve equipment switch control method Download PDFInfo
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- CN101119187A CN101119187A CNA2007100456279A CN200710045627A CN101119187A CN 101119187 A CN101119187 A CN 101119187A CN A2007100456279 A CNA2007100456279 A CN A2007100456279A CN 200710045627 A CN200710045627 A CN 200710045627A CN 101119187 A CN101119187 A CN 101119187A
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Abstract
The present invention relates to a controlling method for the switch between a principal device and a subordinate device in a redundant system, which at least comprises a principal server object, a client object, a standby server object, a principal working channel connected between the principal server object and the client object and a standby working channel connected between the standby server object and the client object. The principal server object is connected with the standby server object through a monitoring communication connecting manner. The present invention is characterized in that: when the principal and standby server communicates normally, the principal server object transmits initiatively an switching control order to start the switch between the principal device and subordinate device according to the fault signal of principal working channel running state; when the principal server object and the standby server object communicates unsuccessfully, the standby working channel starts the switch between the principal device and subordinate device according to the fault signal of monitoring principal working channel running state. Compared with the prior art, when the judgment that whether to switch the principal and subordinate device is made, the present invention not only considers the running states of both the principal server object and the principal working channel but also provides a method for judging the self running state of the principal server object and the running state of the principal working channel. Compared with the prior art, the present invention is a redundancy switching controlling mechanism which is safer and more perfect.
Description
Technical field
The present invention relates to the method for handover control of working between a kind of equipment, particularly relate to master-salve equipment switch control method in a kind of redundant system.
Background technology
In the industrial automation field, in order to improve the reliability of system, generally the functional part that can play a crucial role to the continuous operations of system carries out redundant configuration, and the spare unit of its redundant configuration can adopt identical configuration with main operative components, to reduce risk, increase the reliability of system.The effect of redundant configuration is before main operative components breaks down or needs more change owner operative components maybe to need the inner working system of main operative components done to upgrade upgrading, take over internal information by adopting spare unit, and as new operation system running, make this system not have the continuation operation of interruption back-up system.
Usually, when making up redundant system, need switch redundancy and control, like this, when in running order main equipment accident breaks down, by redundancy switch-over control method, start the stand-by equipment running, to guarantee the continuity of control task.
At present, in the known redundancy switch-over control method, generally all can between master-slave equipment, set up real time communication mechanism, main equipment regularly sends the running status of self repeatedly to stand-by equipment, when stand-by equipment detects that main equipment breaks down and self is when working properly, promptly carry out master-slave equipment and switch, and above-mentioned self-operating state information has only comprised the hardware effort information of main equipment and system's operation information of main equipment.For example publication number is just to mention a kind of like this telecommunication apparatus master-slave switching method in the Chinese invention patent " telecommunication apparatus master-slave switching method and communication equipment " of CN1815908A, and it may further comprise the steps: a, as first equipment of main equipment by CPU house dog monitoring state; Second equipment as slave unit passes through CPU house dog monitoring state; Main equipment and slave unit output self principal and subordinate's marking signal is to the other side; B, first equipment and second equipment are according to the other side's master slave mode decision self operating state.Marking signal determines self operating state thereby above-mentioned telecommunication apparatus master-slave switching method is only mentioned master-slave equipment detection self; promptly whether needing to carry out the principal and subordinate switches; and between master-slave equipment and the external customer equipment whether normal communication is not done to consider; and be that the patent of CN1815908A only mentions hereinafter for self marking signal at described publication number be main or slave unit operation irregularity or receive switching command, as for how judging main or the slave unit operation irregularity is not all addressed in the text.
Publication number is that the Chinese invention patent " equipment and the method that are used for redundant switching controls " of CN1275000A has also been mentioned a kind of redundancy switch-over control method with redundancy structure of operation system and back-up system for another example, this method comprises: two control device, operation system running as the control controlled device, described two control device are connected to the other side's device by holding wire, this holding wire transmits the normal/abnormal state of the control device of indication oneself, install/installment state not, switch a kind of status signal in the operating state of enable/disable state or running/not, the described signal of another control device by this holding wire, identification state is each other carried out the switching between operation system and the back-up system.In the above-mentioned redundancy switch-over control method method, the main foundation whether decision needs to carry out handover operation is still judged the status signal of two control device, these status signals are only just represented the running situation of self, and for whether normal communication is not done to consider yet between control device and the controlled device, more do not study and mention how to judge and identification control device and controlled device between communication whether normal, and in the redundant system master-salve equipment switch control method between control device and the controlled device whether normal communication be whether need to consider the final factor switched, also be greatest factor; Simultaneously, above-mentioned status signal is to transmit by being connected two holding wires between the control device, if holding wire breaks down, status signal transmission between two control device will go wrong, will occur two kinds of results like this: first is exactly not do response after standby control device does not receive the status signal of main control unit, the second, standby control device does not receive to start automatically behind the status signal of main control unit and switches, and so just is easy to cause mistake to switch.
Summary of the invention
Technical problem to be solved by this invention is to consider not only when providing a kind of master-slave equipment to switch at above-mentioned prior art that whether whether master-slave equipment self-operating state normally reach between master-slave equipment and the external customer equipment normal communication, also considers can effectively avoid when the holding wire that connects between the master-slave equipment breaks down the master-salve equipment switch control method of mistake switching.
The technical problem that the present invention further will solve is, in above-mentioned master-salve equipment switch control method process, a kind of method that how to detect master-slave equipment self-operating state is provided and how judges and whether discern between master-slave equipment and the external customer equipment method of normal communication.
The present invention solves the technical scheme that above-mentioned first technical problem adopts: this master-salve equipment switch control method, at least include a master server object that is moving, one target client, one has the standby server object of identical configuration with the master server object, and one is connected main working channel and between master server object and target client is connected standby working channel between standby server object and target client; The master server object is connected with the standby server object by monitoring the communication connected mode; It is characterized in that: described master-salve equipment switch control method comprises following steps:
Step 1: set up real time communication mechanism between standby server object and master server object, the master server object can send main running status to the standby server object repeatedly according to the time interval that defines;
Step 2: normal when communicating by letter between standby server object and the master server object, the master server object regularly detects main running status, when main running status breaks down, the standby server object is normal, then the master server object initiatively sends the switching controls order to the standby server object, the standby server object starts the standby working channel of operation, and the target client is by standby working channel and standby server object communication; When main running status is normal, the target client continues by main working channel and master server object communication;
Step 3: break down when communicating by letter between standby server object and the master server object; The standby server object is monitored main active channel state by standby working channel, when main active channel state breaks down, communication disruption between master server object and target client and the standby server object is normal, then standby server starts the standby working channel of operation according to the fault-signal in the main active channel state that receives, and the target client is by standby working channel and standby server object communication; When main active channel state is normal, the target client continues by main working channel and master server object communication.
Above-mentioned main running status comprises the running status of master server object and the running status of main working channel.Promptly when between the active/standby server object during proper communication, as long as any one state breaks down and the standby server object is normal in the running status of master server object and the main working channel running status, then system carries out master-slave equipment and switches; And the communication of working as between the active/standby server object is broken down, standby working channel is monitored main active channel state, have only after main active channel state breaks down, just starting the principal and subordinate switches, rather than because the standby server object does not receive main running state information, just judging that thereby master server object fault starts carries out the principal and subordinate and switches, and the mistake that can effectively avoid the master server object of normally operation to switch to the standby server object is like this switched.
The above-mentioned communication connected mode of monitoring is network communication or serial communication mode.
The present invention solves above-mentioned second technical scheme that technical problem adopted: the detection method of master/slave server object running status comprises following steps:
Step (one): the master server object regularly detects whether off line of the external equipment that is attached thereto, if detect all off lines of all external equipments in fixed time interval, then represents master server object fault;
Step (two): the master server object is connected with external equipment normally, and the standby server object regularly detects the traffic of master server object, if do not detect the traffic of master server object in fixed time interval, then represents master server object fault.
The method that active channel state detects between master/slave server object and the external target client comprises following steps:
Step (one): for each target client and server object are provided with four parameters:
FER (Floating Error Rate): the invalidation word joint number that receives accounts for the percentage of the total bytes that receives;
Communication errors extreme value: the maximum limit of FER (Floating Error Rate);
Stream rate: the byte number that per second receives is taken advantage of 8 number;
The communication statistic information time interval;
Step (two): in a communication statistic information the time interval:
When stream rate is 0, represent that then active channel state breaks down;
When stream rate is not 0, if FER (Floating Error Rate), represents that active channel state is good less than the communication errors extreme value; If FER (Floating Error Rate), represents then that active channel state breaks down greater than the communication errors extreme value.
In order to guarantee the perfect of redundancy scheme, as further improvement, master server object of the present invention has two working channel ports at least, main working channel when between master server object and target client breaks down, the master server object switches to another working channel port with the main working channel port of all external equipments, and the standby working channel port of other of master server object receives the wheel current test.Equally, described standby server object also has at least two working channel ports, standby working channel when between standby server object and target client breaks down, the standby server object switches to another working channel port with the standby working channel port of all external equipments, and the standby working channel port of standby server object receives the wheel current test.Certainly, the target client also can have a plurality of working channel ports, and the main working channel when between target client and master server object breaks down, and the target client switches to standby working channel port with main working channel port.
Above-mentioned channeling port changing method comprises following steps:
Step 1: for each working channel is set a secure access timer;
Step 2: whether judgment task channel safety visit timer overtime, as do not have overtime, the evaluation work channel status; As overtime, postpone an end after the time, whether continue judgment task channel safety visit timer overtime;
Step 3: if the work at present channel status breaks down, judge whether task correctly closes on another working channel port,, then activate another working channel port if task is correctly to close on another working channel port;
Step 4: if the task right and wrong are normally closed on another working channel port, then repeating step 1, step 2, step 3.
Step 5: close if all working channeling port is all improper, represent that then active channel state breaks down.
Compared with prior art, the invention has the advantages that: first, whether need in the redundant system basis for estimation that master-slave equipment switches is no matter whether the communication between the active/standby server object is normal, the standby server object is normal as long as main working channel running status breaks down, promptly carrying out master-slave equipment switches, rather than the running status of only considering standby server object detection road master server object just carries out master-slave equipment after breaking down and switches, and can better avoid mistake to switch; The second, when judging master server object self-operating state, one timer is set, surpass timer do not detect at interval the master server object the traffic or with the peripheral hardware off line, just judge master server object fault; The 3rd, for active and standby working channel is set up FER (Floating Error Rate), communication errors extreme value, stream rate, the communication statistic information time interval four parameters, whether judgment task channel that can safety and stability is working properly.The invention provides master-salve equipment switch control method, to compare prior art be safer, a more perfect redundant handover control mechanism.
Description of drawings
Fig. 1 is the structured flowchart of redundant system in the embodiment of the invention;
Fig. 2 is a master server object method for handover control flow chart in the embodiment of the invention;
Fig. 3 is the method for handover control flow chart of standby server object in the embodiment of the invention;
Fig. 4 is an active/standby detection method flow chart with the server object running status in the embodiment of the invention;
Fig. 5 is the method flow diagram that active/standby active channel state detects in the embodiment of the invention;
Channeling port changing method flow chart in Fig. 6 embodiment of the invention.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
In the redundant system shown in Figure 1, include the master server object 1 that is moving, the target client 2, has the standby server object 3 of identical configuration with the master server object, the main working channel that connects master server object and target client, connection standby server object and target client's standby working channel; The master server object is connected with the standby server object by monitoring the communication connected mode; This can monitor the communication connected mode can also can be serial communication mode for network communication mode.
The master server object links to each other by holding wire with the standby server object, and set up real time communication mechanism by this holding wire between standby server object and the master server object, the master server object can send the running status of the self-operating state of master server object and main working channel to the standby server object repeatedly according to the time interval that defines; The method for handover control of master server object and standby server object is that the active/standby server object carries out logic determines simultaneously.For the master server object, the master server object is regularly judged main active channel state whether normal 12, if main active channel state is normal, it does not start and switches 13, if main active channel state is undesired, its running status of judging the standby server object whether normal 14, if standby server object running status is undesired or the standby server object judge with the master server object between communicate by letter undesired, it is undesired then all to be judged as the standby server object, at this moment, do not start switching 13 yet; If standby server is normal to liking, then the master server object initiatively sends switching command 15 to the standby server object, starts switching 16, as shown in Figure 2.
For standby server, the running status of at first judging the master server object whether normal 11, if it is normal to judge the running status of master server object, then do not carry out the principal and subordinate and switch 13, if it is undesired to judge the running status of master server object, perhaps the standby server object judge with the master server object between communicate by letter undesired, then the standby server object starts standby working channel main working channel is monitored 17, by the running status 12 of judging main working channel, when the running status of main working channel is also normal, then do not carry out the principal and subordinate and switch 13; Running status as main working channel breaks down, the standby server object is normal, then starts immediately and switches 16, as shown in Figure 3.
As Fig. 4, the self-operating state 11 of above-mentioned judgement master server object starts from the timer 111 that starts a Fixed Time Interval, judge timer whether overtime 112, as timer expiry, turn back to 111, do not have overtimely as timer, judge whether off line 113 of external equipment that main master server object is attached thereto, as the external equipment off line that the master server object is attached thereto, then provide master server object fault-signal 114; The external equipment off line that is attached thereto as the master server object does not have off line, continue to judge whether the traffic 115 is arranged between master server object and the target client, as the traffic is zero, then provide master server object fault-signal 114, non-vanishing as the traffic, then provide master server object signal 116 working properly.
The present invention is provided with four parameters for each target client and server object: FER (Floating Error Rate) is defined as the percentage that the invalidation word joint number that receives accounts for the total bytes that receives; The communication errors extreme value is defined as the maximum limit of FER (Floating Error Rate); Stream rate, the byte number that is defined as the per second reception is taken advantage of 8 number; In the communication statistic information time interval, be defined as the timer of a Fixed Time Interval.
The running status 12 of the main working channel of above-mentioned judgement starts from the timer 121 that starts a communication statistic information time interval equally, judge timer whether overtime 122, as timer expiry, turn back to 121, do not have overtime as timer, whether the judgment data flow rate is 0 123, as the data flow rate is zero, then provides the active channel state signal 124 that breaks down, non-vanishing as the data flow rate, whether continue the judgment frame error rate less than communication errors extreme value 125, if FER (Floating Error Rate), then provides the active channel state signal 124 that breaks down greater than the communication errors extreme value, if FER (Floating Error Rate) is less than the communication errors extreme value, then provide active channel state normal signal 126, see Fig. 5 for details.
In order to guarantee the perfect of redundancy scheme, master server object of the present invention has two working channel ports at least, main working channel when between master server object and target client breaks down, the master server object switches to another working channel port with the main working channel port of all external equipments, and the standby working channel port of other of master server object receives the wheel current test.Equally, described standby server object also has at least two working channel ports, standby working channel when between standby server object and target client breaks down, the standby server object switches to another working channel port with the standby working channel port of all external equipments, and the standby working channel port of standby server object receives the wheel current test.Certainly, the target client also can have a plurality of working channel ports, and the main working channel when between target client and master server object breaks down, and the target client switches to standby working channel port with main working channel port.In the present embodiment, the master server object has four working channel ports, and the standby server object also has four working channel ports, and the target client has two working channel ports.
As Fig. 6, in order to guarantee the safe and smooth of active and standby working channel, the present invention is provided with a secure access timer for each working channel; The channeling port changing method starts from equally and starts a secure access timer 131, judges that whether overtime timer 132, as overtime, postpones 10 millisecond 133, turns back to 131 after then, as do not have overtime, evaluation work channel status 134; Judge whether the work at present channel status breaks down 135,, provide work at present channel status normal signal 136 as not breaking down; As break down, judge whether next working channel port normally closed 137 last time, as improper closing last time, judged whether also to exist next working channel port one 38, if any, then postpone 10 millisecond 133, turn back to 131 after then; As above subnormal closing then activated next working channel port one 39, and provides work at present channel status normal signal 136, closes as all working channeling port is all improper, then provides work at present channel status fault-signal 140.
Claims (11)
1. master-salve equipment switch control method, at least include a master server object that is moving, one target client, one has the standby server object of identical configuration with the master server object, and one is connected main working channel and between master server object and target client is connected standby working channel between standby server object and target client; The master server object is connected with the standby server object by monitoring the communication connected mode; It is characterized in that: described master-salve equipment switch control method comprises following steps:
Step 1: set up real time communication mechanism between standby server object and master server object, the master server object can send main running status to the standby server object repeatedly according to the time interval that defines;
Step 2: normal when communicating by letter between standby server object and the master server object, the master server object regularly detects main running status, when main running status breaks down, the standby server object is normal, then the master server object initiatively sends the switching controls order to the standby server object, the standby server object starts the standby working channel of operation, and the target client is by standby working channel and standby server object communication; When main running status is normal, the target client continues by main working channel and master server object communication;
Step 3: break down when communicating by letter between standby server object and the master server object; The standby server object is monitored main active channel state by standby working channel, when main active channel state breaks down, communication disruption between master server object and target client and the standby server object is normal, then standby server starts the standby working channel of operation according to the fault-signal in the main active channel state that receives, and the target client is by standby working channel and standby server object communication; When main active channel state is normal, the target client continues by main working channel and master server object communication.
2. master-salve equipment switch control method according to claim 1 is characterized in that described main running status comprises the running status of master server object and the running status of main working channel.
3. master-salve equipment switch control method according to claim 1 is characterized in that the described communication connected mode of monitoring is network communication or serial communication mode.
4. master-salve equipment switch control method according to claim 2 is characterized in that: the detection method of server object running status comprises following steps in the described step 2:
Step (one): the master server object regularly detects whether off line of the external equipment that is attached thereto, if detect all off lines of all external equipments in fixed time interval, then represents master server object fault;
Step (two): the master server object is connected with external equipment normally, and the standby server object regularly detects the traffic of master server object, if do not detect the traffic of master server object in fixed time interval, then represents master server object fault.
5. master-salve equipment switch control method according to claim 1 is characterized in that: the method that active channel state detects in the described step 3 comprises following steps:
Step (one): for each target client and server object are provided with four parameters:
FER (Floating Error Rate): the invalidation word joint number that receives accounts for the percentage of the total bytes that receives;
Communication errors extreme value: the maximum limit of FER (Floating Error Rate);
Stream rate: the byte number that per second receives is taken advantage of 8 number;
The communication statistic information time interval;
Step (two): in a communication statistic information the time interval:
When stream rate is 0, represent that then active channel state breaks down;
When stream rate is not 0, if FER (Floating Error Rate), represents that active channel state is good less than the communication errors extreme value; If FER (Floating Error Rate), represents then that active channel state breaks down greater than the communication errors extreme value.
6. according to according to the described master-salve equipment switch control method of arbitrary claim in the claim 1 to 5, it is characterized in that: described master server object has two working channel ports at least, main working channel when between master server object and target client breaks down, the master server object switches to another working channel port with the main working channel port of all external equipments, and the standby working channel port of other of master server object receives the wheel current test.
7. master-salve equipment switch control method according to claim 6 is characterized in that: described channeling port changing method comprises following steps:
Step 1: for each working channel is set a secure access timer;
Step 2: whether judgment task channel safety visit timer overtime, as do not have overtime, the evaluation work channel status; As overtime, postpone an end after the time, whether continue judgment task channel safety visit timer overtime;
Step 3: if the work at present channel status breaks down, judge whether task correctly closes on another working channel port,, then activate another working channel port if task is correctly to close on another working channel port;
Step 4: if the task right and wrong are normally closed on another working channel port, then repeating step 1, step 2, step 3.
Step 5: close if all working channeling port is all improper, represent that then active channel state breaks down.
8. according to according to the described master-salve equipment switch control method of arbitrary claim in the claim 1 to 5, it is characterized in that: described target client has two working channel ports, main working channel when between target client and master server object breaks down, and the target client switches to another working channel port with main working channel port.
9. master-salve equipment switch control method according to claim 8 is characterized in that: described channeling port changing method comprises following steps:
Step 1: for each working channel is set a secure access timer;
Step 2: whether judgment task channel safety visit timer overtime, as do not have overtime, the evaluation work channel status; As overtime, postpone an end after the time, whether continue judgment task channel safety visit timer overtime;
Step 3: if the work at present channel status breaks down, judge whether task correctly closes on another working channel port,, then activate another working channel port if task is correctly to close on another working channel port;
Step 4: if the task right and wrong are normally closed on another working channel port, then repeating step 1, step 2, step 3.
Step 5: close if all working channeling port is all improper, represent that then active channel state breaks down.
10. according to according to the described master-salve equipment switch control method of arbitrary claim in the claim 1 to 5, it is characterized in that: described standby server object has at least two working channel ports, standby working channel when between standby server object and target client breaks down, the standby server object switches to another working channel port with the standby working channel port of all external equipments, and the standby working channel port of standby server object receives the wheel current test.
11. master-salve equipment switch control method according to claim 10 is characterized in that: described channeling port changing method comprises following steps:
Step 1: for each working channel is set a secure access timer;
Step 2: whether judgment task channel safety visit timer overtime, as do not have overtime, the evaluation work channel status; As overtime, postpone an end after the time, whether continue judgment task channel safety visit timer overtime;
Step 3: if the work at present channel status breaks down, judge whether task correctly closes on another working channel port,, then activate another working channel port if task is correctly to close on another working channel port;
Step 4: if the task right and wrong are normally closed on another working channel port, then repeating step 1, step 2, step 3.
Step 5: close if all working channeling port is all improper, represent that then active channel state breaks down.
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| CN200710045627A CN101119187B (en) | 2007-09-06 | 2007-09-06 | Master-salve equipment switch control method |
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