CN102158255A - Method and system for determining transmission parameter values between node equipment as well as node equipment - Google Patents
Method and system for determining transmission parameter values between node equipment as well as node equipment Download PDFInfo
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- CN102158255A CN102158255A CN201110056875XA CN201110056875A CN102158255A CN 102158255 A CN102158255 A CN 102158255A CN 201110056875X A CN201110056875X A CN 201110056875XA CN 201110056875 A CN201110056875 A CN 201110056875A CN 102158255 A CN102158255 A CN 102158255A
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Abstract
The embodiment of the invention provides a method for determining transmission parameter values between node equipment, which is used for solving the signal integrity problem caused by unreasonable setup of transmission signal parameters between the node equipment in a storage system in the prior art. The method comprises the following steps: selecting a first transmission parameter value from a corresponding storage table of cable length intervals and transmission parameter values; sending a transmission signal to the node equipment at a receiving terminal according to the selected first transmission parameter value; and receiving information fed back by the node equipment at the receiving terminal, and determining the transmission parameter values adopted for data transmission between the node equipment at two terminals in the corresponding table according to the feedback information.
Description
Technical field
The present invention relates to technical field of information storage, relate in particular to the method for the transmission parameter values between a kind of definite node device, system and a kind of node device of the transmission parameter values between a kind of definite node device.
Background technology
In the open storage system, for example based on serial attaching SCSI (Serial Attached SCSI, SAS) or optical-fibre channel (Fibre Channel comprises polytype node device, for example control appliance, hard disk array equipment etc. in storage system FC).For the consideration of link cost aspect, do not adopt optical fiber usually, but adopt lower-cost cable to connect different node devices.
According to different actual conditions, the cable of needs use different length connects the node device in the storage system.For example, for can the more node device of cascade number, when wherein the geographic distance between two node devices is far away, need to use the long cable (for example 8 meters) of length to connect; When the geographic distance between two node devices is nearer,, adopt short cable (as 1 meter) to connect in order to save cost or convenient wiring.
Come under the situation of interaction data each other by transmission signals at two node devices that connect by cable, node device need determine to send the required driving force of transmission signals and the transmission characteristic of transmission signals according to the transmission parameter values that is provided with before the formal transmission of beginning data.Generally having transmission parameter values in the equipment tabulates with the corresponding relation of the intensity level that sends signal, the user can be according to actual needs the intensity of transmission signal transmission parameter values is set, for example the user to wish to send the intensity level of signal be 200MV, the transmission parameter values that the 200MV correspondence then is set gets final product.
As a rule, when transmitting terminal uses identical driving force to send the transmission signals of same intensity value, the cable length between transmitting terminal and receiving terminal more in short-term, the intensity of the transmission signals that receiving terminal receives is stronger; When the cable length between transmitting terminal and the receiving terminal is longer, the intensity of the transmission signals that receiving terminal receives a little less than.
Prior art is generally determined in the storage system transmission parameter values of each node device transmission The data by test repeatedly: the transmission signals of transmission parameter values correspondence wants to satisfy simultaneously the demand of the longest cable and the stub cable of this storage system support, promptly, all adopt the transmission signals of same transmission parameter values correspondence to carry required mutual data at the node device that uses the different length cable to connect in the storage system.
The inventor is in implementing process of the present invention, find that there is following at least problem in prior art: satisfy minimum received signal requirement of strength for transmission signals between two node devices that guarantee to connect usually by the longest cable, the intensity of the transmission signals of default transmission parameter values correspondence is all stronger, this will cause by two node devices connecting than stub cable when the interaction data, the intensity of the transmission signals that receiving terminal node equipment receives is strong excessively, the intensity that surpasses actual needs far away, not only cause energy waste, also can cause too much electromagnetic radiation, bring problems of Signal Integrity.
Summary of the invention
The embodiment of the invention provides the method for the transmission parameter values between a kind of definite node device, occurs problems of Signal Integrity in order to solve prior art owing to the parameter of the transmission signals between node device in the storage system is provided with unreasonable causing.
Accordingly, the embodiment of the invention also provides the system of the transmission parameter values between a kind of node device and a kind of definite node device.
The technical scheme that the embodiment of the invention provides is as follows:
The method of the transmission parameter values between a kind of definite node device comprises:
Selection first transmission parameter values the correspondence table of and transmission parameter values interval from the cable length of storage;
According to first transmission parameter values of selecting, send transmission signals to receiving terminal node equipment;
Receive receiving terminal node equipment feedack, and the transmission parameter values in the described correspondence table of determining to adopt with described receiving terminal node equipment transmission data according to described feedack.
A kind of node device comprises:
Selected cell, the correspondence table that is used for and transmission parameter values interval from the cable length of storage is selected first transmission parameter values;
First transmitting element is used for first transmission parameter values selected according to selected cell, sends transmission signals to other node devices;
Receiving element is used to receive the transmission signals feedack that described other node devices send according to first transmitting element;
Determining unit is used for the information that receives according to receiving element, determines the transmission parameter values with described other node devices transmission The data.
The system of the transmission parameter values between a kind of definite node device comprises:
Sender node equipment, the correspondence table that is used for and transmission parameter values interval from the cable length of storage is selected first transmission parameter values, according to first transmission parameter values of selecting, sends transmission signals to receiving terminal node equipment; Receive receiving terminal node equipment feedack, and according to the transmission parameter values in the described correspondence table of the definite and described receiving terminal node transmission of described feedack The data;
Receiving terminal node equipment is used for the transmission signals that the receiving end/sending end node device is sent; Determine the intensity level of received signal; According to the intensity level of the received signal of determining, to sender node equipment feedback information.
Select first transmission parameter values the correspondence table of the embodiment of the invention and transmission parameter values interval from the cable length of storage by sender node equipment, and according to first transmission parameter values of selecting, to receiving terminal node equipment transmission transmission signals; The receiving terminal node equipment feedack that receives, and determine the transmission parameter values that adopts with the receiving terminal node equipment transmission data according to the feedback information that receives, solved problems of Signal Integrity and energy waste problem that universality transmission parameter values that prior art is provided with the demand of the longest cable that satisfies the storage system support simultaneously and stub cable is brought.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 a is the main realization principle flow chart of the embodiment of the invention;
Fig. 1 b is the detail flowchart that the embodiment of the invention mainly realizes step 40 in the principle flow chart;
The schematic diagram of the applied storage system of scheme of definite transmission parameter values that Fig. 2 provides for the embodiment of the invention;
Fig. 3 a is the first pass schematic diagram of the embodiment of the invention two;
Fig. 3 b is second schematic flow sheet of the embodiment of the invention two;
Fig. 4 is the schematic flow sheet of the embodiment of the invention three;
The structural representation of a kind of node device that Fig. 5 provides for the embodiment of the invention;
The structural representation of determining unit in the node device that Fig. 6 provides for the embodiment of the invention;
The structural representation of the another kind of node device that Fig. 7 provides for the embodiment of the invention.
Embodiment
The inventor finds in the process of the transmission parameter values of the transmission signals of the demand of seeking the longest cable satisfy the storage system support simultaneously and stub cable by test repeatedly, find the transmission parameter values of the transmission signals that satisfies the longest cable that storage system supports and stub cable needs simultaneously very difficult, need expend long period and more workload, even searched out a comparatively suitable transmission parameter values, the transmission requirement that every index of the transmission signals of this transmission parameter values correspondence will satisfy the different length cable simultaneously is also very difficult, for example when amplitude of oscillation index meets the demands, shake index, error rate index does not meet the demands or the like.But if shorten the length range of cable, the transmission parameter values that meets the demands is easier to determine relatively.The cable length of promptly supposing the storage system support is 0 meter～8 meters, and it is very difficult searching out the transmission parameter values that satisfies the requirement of all lengths cable in 0 meter～8 meters scopes simultaneously.But, search out simultaneously the transmission parameter values that satisfies the requirement of all lengths cable in 0 meter～3 meters scopes or the transmission parameter values that satisfies the transmission parameter values of the requirement of all lengths cable in 3 meters～6 meters scopes simultaneously or satisfy the requirement of all lengths cable in 6 meters～8 meters scopes simultaneously is more or less freely.Thereby the scheme that a kind of mechanism of consulting mutually by sender node equipment and receiving terminal node equipment is determined the transmission parameter values between sender node equipment and the receiving terminal node equipment proposed.
The embodiment of the invention proposes: select a transmission parameter values the correspondence table of sender node equipment and transmission parameter values interval from the cable length of storage, and according to the transmission parameter values of selecting, to receiving terminal node equipment transmission transmission signals; And, determine the transmission parameter values that adopts with the receiving terminal node equipment transmission data according to receiving terminal node equipment feedack.Above-mentioned sender node equipment and receiving terminal node equipment can be the control appliance in the open storage system, perhaps Disk Array or the like.
Be explained in detail to the main realization principle of embodiment of the invention technical scheme, embodiment and to the beneficial effect that should be able to reach below in conjunction with each accompanying drawing.
As shown in Figure 1a, the main realization principle process of the embodiment of the invention is as follows:
The intensity level that with the feedack is received signal is an example, determines that specifically mode is:
Sender node equipment judges that the intensity level of described received signal is whether in the predetermined strength scope;
If the intensity level of described received signal is in the predetermined strength scope, then with first transmission parameter values of current selection as transmitting the transmission parameter values of The data with receiving terminal node.
If the intensity level of described received signal is not in the predetermined strength scope, then from correspondence table, select second transmission parameter values once more, and according to second transmission parameter values, send transmission signals, the intensity level of the received signal that reception receiving terminal node equipment feeds back once more to receiving terminal node equipment;
If the intensity level of the received signal that receiving terminal node equipment feeds back once more is not still in the predetermined strength scope, then from correspondence table, select the 3rd transmission parameter values once more, send transmission information according to the 3rd transmission parameter values to receiving terminal node equipment, the intensity level of the received signal that the receiving terminal node device is newly fed back is judged again, by that analogy, till the intensity level of receiving terminal node equipment received signal is in predetermined strength value scope.
The wasting of resources that causes for fear of unnecessary repeated interaction is that the intensity level of received signal is an example with the feedack, and shown in accompanying drawing 1b, the step 40 among the accompanying drawing 1a specifically may further comprise the steps:
When feedack be used to show received signal intensity level in the predetermined strength scope discrimination flag or be the intensity level that is used to show received signal not under the situation of the discrimination flag in the predetermined strength scope, concrete in the step 40 determines that mode is:
If described discrimination flag is the discrimination flag of intensity level in the predetermined strength scope that shows received signal, then with the transmission parameter values of current selection as transmitting the transmission parameter values of The data with receiving terminal node; If described discrimination flag is the intensity level not during the discrimination flag in the predetermined strength scope that shows received signal, from described correspondence table, select second transmission parameter values; According to second transmission parameter values of selecting, send transmission signals to receiving terminal node equipment; Receive the discrimination flag that receiving terminal node equipment feeds back once more.
If the discrimination flag that receiving terminal node equipment feeds back once more shows that the intensity level of received signal is not still in the predetermined strength scope, then from correspondence table, select the 3rd transmission parameter values once more, send transmission information according to the 3rd transmission parameter values to receiving terminal node equipment, the discrimination flag that the receiving terminal node device is newly fed back is discerned again, by that analogy, till intensity level that discrimination flag shows received signal is in the predetermined strength scope.
Alternatively, for the transmission parameter values that can allow sender node equipment that receiving terminal node equipment can know that step 40 is determined and receiving terminal node equipment transmission data adopt, can also comprise after step 40: sender node equipment sends to the transmission parameter values of determining the step of receiving terminal node equipment.
Alternatively, in above-mentioned steps 142,, can adopt following any one to seek strategy in order to improve the searching efficient of transmission parameter values:
Strategy one
If at first selecting the interval corresponding transmission parameter values of the longest cable length of length in step 10 is first transmission parameter values, send transmission signals according to first transmission parameter values of selecting, when the intensity level of the received signal of receiving terminal node equipment feedback during not in the predetermined strength scope, according to cable length order from long to short, select the length of interval corresponding adjacent successively with the preceding transmission parameter values of once selecting, and the interval corresponding transmission parameter values (also can be understood as according to transmission parameter values respective signal intensity level by selecting successively to weak order by force) of the cable length of the length of interval of once selecting before cable length is shorter than is till the intensity that receives the received signal that receiving terminal node equipment feeds back is in the predetermined strength scope.
Strategy two
If the interval corresponding transmission parameter values of the shortest cable length of sender node choice of equipment cable length in step 10 at first, and send transmission signals according to the transmission parameter values of the shortest length of interval correspondence of the cable length of selecting, consider by being lower than that minimum received signal requirement of strength is ignored received signal and not feedback information of receiving terminal node equipment owing to the intensity of received signal, in sender node equipment, can be provided with one and wait for duration, when sender node equipment treats that above these duration does not receive feedack, according to cable length interval order from short to long, from correspondence table, select the length of interval corresponding adjacent with the preceding transmission parameter values of once selecting, and the interval corresponding transmission parameter values of the cable length of the length of interval of once selecting before cable length is longer than sends corresponding transmission signals, till the intensity of the received signal that receives receiving terminal node equipment feedback is in the predetermined strength scope.
Strategy three
In the correspondence table of cable length interval and transmission parameter values,, can also store the selected probable value of each transmission parameter values except storage cable length of interval and corresponding transmission parameter values.If at first in step 10, select the highest transmission parameter values of probable value, and send transmission signals according to the transmission parameter values of selecting, when the intensity level of the received signal of receiving terminal node equipment feedback during not in the predetermined strength scope, can be according to probable value order from high to low, select successively and the transmission parameter values of selection once before the adjacent and corresponding selected probable value of the probable value of the preceding transmission parameter values of once selecting is lower than, till the intensity that receives the received signal that receiving terminal node equipment feeds back is in the predetermined strength scope.
Certainly, other the searching strategy that substitutes can also be arranged, here enumerate no longer one by one.
Below will be according to foregoing invention principle of the present invention, be that node device A, transmission parameter values serve as that the intensity that sends signal is that example is introduced three embodiment in detail and come the main realization principle of the inventive method is explained in detail and illustrates with sender node equipment.
Embodiment one
Store the correspondence table of cable length interval and transmission parameter values in the shared memory space that can supply the node device in this storage system to visit in sender node equipment or the storage system, comprise at least two cable length intervals in the correspondence table, and the interval corresponding transmission parameter values of these at least two cable lengths.Information in this correspondence table can obtain in the following ways:
The cable length of storage system support is divided at least two length of interval, is 3 cable length intervals with the cable length scope division in the present embodiment, is respectively [0 meter, 0.5 meter], [0.5 meter, 5 meters], [5 meters, 8 meters].Specifically how the partition length interval can obtain according to the test experience, is not unique, for example also can be [0 meter, 3 meters], [3 meters, 8 meters] two cable length intervals with 0 meter～8 meters cable length scope division.The interval superimposed cable length scope that storage system is supported that is of each cable length, certain situation that also has discontinuous between the adjacent cable length interval, as to have vacancy interval.
Obtain the corresponding respectively transmission parameter values of each length of interval by test, and in correspondence table the interval corresponding relation with transmission parameter values of each cable length of storage;
Concrete method of testing is: sender node equipment is selected transmission parameter values from the corresponding lists of the intensity level of transmission parameter values and transmission signal, intensity level with the transmission signal of transmission parameter values correspondence sends transmission signals to the recipient's node device that connects by the different length cable, and the intensity level of the received signal that feeds back of recorder side's node device.Transmission parameter values and the corresponding lists of the intensity level that sends signal (corresponding lists of distinct device may there is some difference) as shown in table 1.
Table 1
| Transmission parameter values | Send the intensity level of signal |
| 0110 | 200MV |
| 1100 | 300MV |
| 1011 | 400MV |
| 0101 | 600MV |
| 0111 | 800MV |
| 1111 | 1200MV |
As shown in table 2, when in table 2, having enumerated sender node equipment and sending intensity level respectively and be the transmission signals of 1200MV, 800MV, with the intensity level of the receiving device received signal that is connected by the different length cable between the sender node equipment according to transmission parameter values 1111,0111.The quantity of test point of choosing different cable lengths during actual measurement is many more, and test result is accurate more.Find that after tested send to the recipient's node that connects by the different length cable under the situation of transmission signals with same transmission parameter values at sender node equipment, the intensity level of received signal is progressively decay along with the increase of cable length.
Table 2
Based on the test result in the table 2,, can determine the transmission parameter values that each length of interval is corresponding respectively according to the predetermined strength scope [150MV, 500MV] of the received signal of receiving terminal node equipment.Be specially: interval at each cable length, when the intensity level of the received signal of correspondence dropped in the predetermined strength scope, the transmission parameter values that sends transmission signals institute foundation was the interval corresponding transmission parameter values of this cable length.The interval corresponding transmission parameter values of cable length has following characteristics: when actual cable length was in this cable length interval, when transmitting data according to this transmission parameter values, received signal can satisfy the requirement of various indexs.And from long term test, transmission quality is reliable and stable when coming transmission signals according to this transmission parameter values.In addition, different cable lengths interval respectively the gap between the intensity level of the corresponding transmission signal that transmission parameter values characterized greater than predetermined value, when promptly sending signal according to the corresponding respectively transmission parameter values in different cable lengths interval, gap between the intensity level of corresponding transmission signal should be greater than predetermined value (when for example sending signal according to the corresponding respectively transmission parameter values of each length of interval, gap between the intensity level of transmission signal should be greater than 100MV, perhaps 120MV or the like, the concrete gap and the kind of storage system, the physical characteristic of cable is relevant), thereby when guaranteeing that the transmission parameter values of correspondence sends transmission signals respectively with different cable lengths interval, the intensity of receiving terminal node equipment received signal can produce significantly, the difference that is enough to distinguish changes.
In the present embodiment, the cable length that obtains by the way interval and the correspondence table of transmission parameter values as shown in table 3.
Table 3
| The cable length interval | Send the intensity level of signal | Transmission parameter values |
| [0 meter, 0.5 meter] | 400MV | 1011 |
| [0.5 meter, 5 meters] | 800MV | 0111 |
| [5 meters, 8 meters] | 1200MV | 1111 |
Embodiment two
The schematic diagram of the applied storage system of scheme of definite transmission parameter values that accompanying drawing 2 provides for the embodiment of the invention comprises node device A, node device B, node device C, node device D in this storage system.In the present embodiment, being 0 meter～8 meters with the cable length scope of this storage system support is that example is introduced, and need to prove that the cable length scope that different storage systems is supported there are differences.Wherein node device A and node device B distance is far away, is placed in respectively in the hardware frame in the chummery not, connects by 8 meters long cables; Node device A and node device C are placed in respectively in the different frames in the same room, connect by 3 meters long cables; Node device A and node device D are placed in the same frame in same room, and close together connects by 0.3 meter long cable.
Accompanying drawing 3a is the schematic flow sheet of the embodiment of the invention, and wherein node device A is a sender node equipment, and node device B is a receiving terminal node equipment.
Step 301, node device A selects the interval corresponding transmission parameter values of the longest cable length of length, the i.e. transmission parameter values 1111 of [5 meters, 8 meters] length of interval correspondence from correspondence table as shown in table 3;
Step 302, node device A sends transmission signals according to the transmission parameter values of selecting to node device B; In the present embodiment, node device A is the transmission signals of 1200MV according to the transmission parameter values of selecting 1111 to node device B transmission intensity level;
Step 303 after node device B receives the transmission signals that node device A sends, is determined the intensity level of received signal;
In the present embodiment, as can be seen from Table 2, the intensity level of receiving terminal node equipment B received signal is 200MV.
The receiving terminal node equipment B determines that the device type under concrete mode and the receiving terminal node equipment of intensity of received signal is relevant, includes but not limited to following mode:
If the intensity of received signal is read in the chip support of node device B, as long as carry out the intensity level that corresponding reading command can obtain received signal; In addition, node device B also can be by reading the intensity that the signal receiving register obtains received signal.
Step 304, node device B sends to node device A with the intensity level of the received signal determined; In the present embodiment, node device B sends to node device A with the intensity level 200MV of the received signal determined;
Alternatively, in the SAS storage system, node device B can send to node device A with the intensity level of the received signal determined by the SAS controller; Or the intensity level of the received signal determined is sent to node device A by out-band methods such as netting twine, Serial Port Lines.
Alternatively, in the FC storage system, node device B can send to node device A with the intensity level of the received signal determined by the FC controller; Or the intensity level of the received signal determined is sent to node device A by out-band methods such as netting twine, Serial Port Lines.
Step 305, whether the intensity level of the received signal of node device A decision node equipment B feedback is in the predetermined strength scope, if not in the predetermined strength scope, according to cable length order from long to short, select and the last interval corresponding transmission parameter values of the interval adjacent cable length of cable length of having selected, transmission parameter values value according to new selection sends transmission signals to node device B, by that analogy, till the intensity of received signal that node device A determines node device B feedback is in the predetermined strength scope; If the intensity level of the received signal of node device A decision node equipment B feedback enters step 306 in the predetermined strength scope;
In the present embodiment, the intensity level 200MV of the received signal of node device A decision node equipment B feedback enters step 306 in predetermined strength scope [150MV, 500MV];
Step 306, node device A with the transmission parameter values of current selection as with the transmission parameter values of node device B transmission The data; In the present embodiment, node device A with current selection 1111 as with the transmission parameter values of node device B transmission The data.
Here need to prove, the judgement that the sender node device A is carried out in the step 305 compares the intensity 200MV and the predetermined strength scope of node device B received signal " step also can carry out by the receiving terminal node equipment B; be that receiving terminal node B is after step 303; intensity and the predetermined strength scope [150MV; 500MV] of the received signal determined are compared, the intensity that will be used to show received signal according to the comparative result whether discrimination flag in the predetermined strength scope is given the sender node device A; The sender node device A is selected transmission parameter values once more according to the differentiation result of receiving terminal node equipment B feedback.Idiographic flow please refer to accompanying drawing 3b:
Step 311, node device A selects the interval corresponding transmission parameter values of the longest cable length of length, the i.e. transmission parameter values 1111 of [5 meters, 8 meters] length of interval correspondence from correspondence table as shown in table 3;
Step 312, node device A sends transmission signals according to the transmission parameter values of selecting to node device B; In the present embodiment, node device A is the transmission signals of 1200MV according to the transmission parameter values of selecting 1111 to node device B transmission intensity level;
Step 313 after node device B receives the transmission signals that node device A sends, is determined the intensity level of received signal;
In the present embodiment, the intensity level of receiving terminal node equipment B received signal is 200MV.
Step 314, node device B is according to the intensity level of the received signal determined, sends the intensity level discrimination flag in the predetermined strength scope whether that is used to show received signal to node device A;
For example, the intensity that sign " N " shows received signal is not in the predetermined strength scope, and sign " Y " shows that the intensity of received signal is in the predetermined strength scope.
In the present embodiment, the intensity level 200MV of received signal is in predetermined strength scope [150MV, 500MV], so node device B sends the discrimination flag of intensity level in the predetermined strength scope that is used to show received signal to node device A;
Step 315, the discrimination flag of node device A decision node equipment B feedback shows that the intensity level of received signal is in the predetermined strength scope, or not in the predetermined strength scope, if not in the predetermined strength scope, according to cable length order from long to short, select and the last interval corresponding transmission parameter values of the interval adjacent cable length of cable length of having selected, transmission parameter values according to new selection sends transmission signals to node device B, by that analogy, till intensity that the discrimination flag that node device A determines node device B feedback shows received signal is in the predetermined strength scope; If the intensity level that the discrimination flag of node device A decision node equipment B feedback shows received signal enters step 316 in the predetermined strength scope;
In the present embodiment, the intensity level 200MV that the discrimination flag of node device A decision node equipment B feedback shows received signal enters step 316 in predetermined strength scope [150MV, 500MV];
Step 316, node device A with the transmission parameter values of current selection as with the transmission parameter values of node device B transmission The data; In the present embodiment, node device A with current selection 1111 as with the transmission parameter values of node device B transmission The data.
In addition, alternatively, after step 305, node device A can also be according to the transmission parameter values of each length of interval correspondence of the intensity level of the received signal of the transmission parameter values that sends the transmission signals foundation, receiving terminal node equipment feedback and storage, determine the residing length of interval of cable length between this sender node equipment and the receiving terminal node equipment, and the cable length block information between memory node device A and the node device B is checked in order to the keeper.For example in the present embodiment node device A according to [5 meters, 8 meters] when the transmission parameter values 1111 of length of interval correspondence sends transmission signals to node device B, the intensity of node device B received signal is in predetermined strength scope [150MV, 500MV] in, then between declarative section point device A and the node device B length of stube cable in [5 meters, 8 meters] length of interval.
Embodiment three
Accompanying drawing 4 is the schematic flow sheet of the embodiment of the invention, present embodiment is a sender node equipment with node device A in the accompanying drawing 2, node device C is a receiving terminal node equipment, and node device A and node device C are placed in respectively in the different frames in the same room, connect by 3 meters long cables.
Step 401, node device A determines the transmission parameter values with node device C transmission The data, from the corresponding respectively transmission parameter values of each length of interval as shown in table 3 of storage, select the transmission parameter values of the longest length of interval correspondence of cable length, the i.e. transmission parameter values 1111 of [5 meters, 8 meters] length of interval correspondence;
Step 402, node device A is according to the transmission parameter values of selecting 1111, and sending intensity level to node device C is the transmission signals of 1200MV;
Step 403 after node device C receives the transmission signals that node device A sends, is determined the intensity level of received signal;
In the present embodiment, node device C determines that the mode and the step 303 among the embodiment one of intensity level of received signal is similar, here repeats no more, and the intensity level of the received signal that node device C determines is 600MV.
Step 404, node device C sends to node device A with the intensity level 600MV of the received signal determined;
Step 405, whether the intensity level of the received signal of node device A decision node equipment C feedback is in the predetermined strength scope, because the intensity level 600MV [150MV, 500MV] not in the predetermined strength scope of the received signal of node device C feedback enters step 406 in the present embodiment;
Step 406, node device A selects from the correspondence table shown in the table 3 and the interval corresponding transmission parameter values 0111 of interval adjacent [0.5 meter, the 5 meters] cable length of [5 meters, 8 meters] cable length according to cable length order from long to short;
Step 407, node device A is according to the transmission parameter values of selecting 0111, and sending intensity level to node device C is the transmission signals of 800MV;
Step 408, after node device C received the transmission signals that the sender node device A sends, the intensity level of determining received signal was 200MV, concrete mode and the step of determining 303 among the embodiment one is similar;
Step 409, node device C feeds back to node device A with the intensity level 200MV of the received signal determined;
Step 410, whether the intensity level of the received signal of node device A decision node equipment C feedback is in the predetermined strength scope, because intensity level 200MV [150MV in the predetermined strength scope of the received signal of node device C feedback in the present embodiment, 500MV], with the transmission parameter values 0111 of current selection as with the transmission parameter values of node device C transmission The data.
In another example, node device A is a sender node equipment, node device D is that the situation of receiving terminal node equipment is similar with embodiment one and embodiment two: node device A selects the interval corresponding transmission parameter values of the longest cable length of length, promptly [5 meters, 8 meters] intensity level 1111 of the interval corresponding transmission signal of cable length, and to send intensity level according to the transmission parameter values of selecting 1111 to node device D be the transmission signals of 1200MV; Node device D confirms that the intensity level of the received signal of feedback is 1100MV and sends to node device A; The intensity level 1100MV that node device A judges the received signal that node device D feeds back for the first time is [150MV in the predetermined strength scope not, 500MV], select and [5 meters again, 8 meters] interval adjacent [0.5 meter of cable length, 5 meters] the interval corresponding transmission parameter values 0111 of cable length, sending intensity level according to the transmission parameter values of selecting for the second time 0111 to node device D is the transmission signals of 800MV; Node device D confirms that the intensity level of the received signal of feedback is 600MV and sends to node device A; The intensity level 600MV that node device A judges the received signal that node device D feeds back for the second time is [150MV in the predetermined strength scope not, 500MV], select and [0.5 meter once more, 5 meters] interval adjacent [0 meter of cable length, 0.5 rice] the interval corresponding transmission parameter values 1011 of cable length, sending intensity level according to the transmission parameter values of selecting once more 1011 to node device D is the transmission signals of 400MV; Node device D confirms that the intensity level of the received signal of feedback is 300MV and sends to node device A; Node device A judges the intensity level 300MV [150MV, 500MV] in the predetermined strength scope of the received signal of node device D feedback, then with 1011 as transmitting the transmission parameter values of The data with receiving terminal node equipment D.
As long as the intensity level of the received signal of node device D feedback is not in the predetermined strength scope, just need reselect interval corresponding transmission parameter values of different cable lengths and node device D consults, intensity level up to the received signal of node device D feedback drops in the predetermined strength scope, in this explanation one by one no longer for example.
The scheme of definite storage nodes equipment room transmission parameter values that the embodiment of the invention provides is selected first transmission parameter values by sender node equipment from the corresponding respectively transmission parameter values of each length of interval of cable of storage, and, send transmission signals to receiving terminal node equipment according to first transmission parameter values of selecting; And determine transmission parameter values with the employing of receiving terminal node equipment transmission data according to the intensity level of the received signal of the receiving terminal node equipment that receives feedback, rather than the universality transmission parameter values that corresponding transmission signals can satisfy the demand of the longest cable that storage system supports and stub cable simultaneously is set in each node device of storage system, saved and tested the workload of seeking the universality transmission parameter values repeatedly, and according to this scheme can in the storage system in twos the cable length between the node device carry out transmission parameter values setting targetedly, cause occurring problems of Signal Integrity thereby avoid being provided with the universality parameter, energy waste and electromagnetic radiation.
Need to prove that the technical scheme that the embodiment of the invention provides also can be simplified the flow process that transmission parameter values is set between the node device in the storage system in execution mode.For example, if the length of actual stube cable between known two node devices, then can directly from correspondence table as shown in table 3, find the interval corresponding transmission parameter values of cable length at actual stube cable length place, send transmission signals according to this transmission parameter values that finds then, as long as determining this transmission parameter values according to the receiving terminal node feedack meets the demands, can be with the transmission parameter values of this transmission parameter values as transmission The data between described two node devices.
Correspondingly, the embodiment of the invention also provides a kind of node device, and as shown in Figure 5, this node device comprises selected cell 501, first transmitting element 502, receiving element 503 and determining unit 504, and is specific as follows:
First transmitting element 502 is used for first transmission parameter values selected according to selected cell 501, sends transmission signals to other node devices;
Receiving element 503 is used to receive the transmission signals feedack that described other node devices send according to first transmitting element 502;
This feedack is the intensity level of received signal, and whether the intensity level that perhaps is used to show received signal discrimination flag in the predetermined strength scope.
Determining unit 504 is used for the information that receives according to receiving element 503, determines the transmission parameter values with described other node devices transmission The data.
Alternatively, the node device in the accompanying drawing 5 also comprises second transmitting element 505, is used for the transmission parameter values that determining unit 604 is determined is sent to described other node devices.
Alternatively, when if other node device feedacks are the intensity level of received signal, please refer to accompanying drawing 6, in the accompanying drawing 5 really order unit 504 comprise that specifically judgment sub-unit 601, first determines that subelement 602, the first indication subelement 603, the second indication subelement 604 and second determine subelement 605, wherein:
Whether judgment sub-unit 601, the intensity level of the received signal that is used to judge that receiving element 503 receives be in the predetermined strength scope;
First determines subelement 602, and the intensity level that is used for judging received signal as if judgment sub-unit 601 is not in the predetermined strength scope, and then second transmission parameter values is selected in triggering selection unit 501 from described correspondence table;
The first indication subelement 603 is used to second transmission parameter values of indicating first transmitting element 502 to select according to selected cell 501, sends transmission signals to described other node devices;
The second indication subelement 604 is used to indicate receiving element 503 to receive the intensity level of the received signal that described other node devices feed back once more;
Second determines subelement 605, be used for if the intensity level that judgment sub-unit 601 is judged received signal in the predetermined strength scope, then first transmission parameter values that selected cell 601 is selected is as transmitting the transmission parameter values of The data with described other node devices.
Accompanying drawing 5 and accompanying drawing 6 described node devices can implementation method embodiment in the function of sender node equipment.
The embodiment of the invention also provides a kind of node device, and as shown in Figure 7, this node device comprises receiving element 701, determining unit 702 and feedback unit 703, wherein:
Receiving element 701 is used to receive the transmission signals that other node devices are sent;
Determining unit 702, the intensity level of the signal that is used for determining that receiving element 701 receives;
Accompanying drawing 7 described node devices can implementation method embodiment in the function of receiving terminal node equipment.
The embodiment of the invention also provides the system of the transmission parameter values between a kind of definite node device, comprises sender node equipment and receiving terminal node equipment, wherein:
Sender node equipment, the correspondence table that is used for and transmission parameter values interval from the cable length of storage is selected first transmission parameter values, according to first transmission parameter values of selecting, sends transmission signals to receiving terminal node equipment; Receive receiving terminal node equipment feedack, and determine to transmit the transmission parameter values of The data according to described feedack with described receiving terminal node;
Receiving terminal node equipment is used for the transmission signals that the receiving end/sending end node device is sent, and determines the intensity level of received signal, and according to the intensity level of the received signal of determining, to sender node equipment feedback information.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, this program can be stored in the computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. the method for the transmission parameter values between a definite node device is characterized in that, comprising:
From the correspondence table of cable length interval and transmission parameter values, select first transmission parameter values;
According to first transmission parameter values of selecting, send transmission signals to receiving terminal node equipment;
Receive receiving terminal node equipment feedack, and the transmission parameter values in the described correspondence table of determining to adopt with described receiving terminal node equipment transmission data according to described feedack.
2. the method for claim 1 is characterized in that, also comprises:
At least two cable length intervals of storage in the described correspondence table, and the interval corresponding respectively transmission parameter values of described at least two cable lengths, gap between the intensity level of the transmission signal that different transmission parameter values characterized in the described correspondence table is greater than predetermined value, and described predetermined value is used to make the difference that received signal produces to be enough to distinguish.
3. the method for claim 1 is characterized in that, described receiving terminal node equipment feedack is:
The intensity level of received signal, or
Whether the intensity level that is used to show received signal discrimination flag in the predetermined strength scope.
4. method as claimed in claim 3, it is characterized in that, described receiving terminal node equipment feedack is the intensity level of received signal, and is described according to the transmission parameter values that described feedack is determined and described receiving terminal node equipment transmission data adopts, and specifically comprises:
Whether the intensity level of judging described received signal is in the predetermined strength scope;
If the intensity level of received signal is not in the predetermined strength scope, from described correspondence table, select second transmission parameter values, according to second transmission parameter values of selecting, send transmission signals to receiving terminal node equipment, the intensity level of the received signal that reception receiving terminal node equipment feeds back once more;
If the intensity level of received signal is in the predetermined strength scope, then with first transmission parameter values as with the transmission parameter values of receiving terminal node equipment transmission data employing.
5. method as claimed in claim 3, it is characterized in that, described receiving terminal node equipment feedack is the intensity level discrimination flag in the predetermined strength scope whether that is used to show received signal, described according to the transmission parameter values that described feedack is determined and the receiving terminal node equipment transmission data adopts, specifically comprise:
If the intensity level that described discrimination flag shows received signal is in the predetermined strength scope, with first transmission parameter values as transmitting the transmission parameter values of The data with receiving terminal node;
If described discrimination flag shows that the intensity level of received signal is not in the predetermined strength scope, from described correspondence table, select second transmission parameter values, according to second transmission parameter values of selecting, send transmission signals to receiving terminal node equipment, receive the discrimination flag that receiving terminal node equipment feeds back once more.
6. as claim 4 or 5 described methods, it is characterized in that, from correspondence table, select first transmission parameter values to be specially:
Selecting the interval corresponding transmission parameter values of the longest cable length of cable length is first transmission parameter values; Or
Selecting the interval corresponding transmission parameter values of the shortest cable length of cable length is first transmission parameter values; Or
Selecting the selected the highest transmission parameter values of probable value is first transmission parameter values.
7. method as claimed in claim 6, it is characterized in that, described second transmission parameter values of selecting from correspondence table is specially: selecting the interval corresponding transmission parameter values of the interval adjacent cable length of the cable length corresponding with first transmission parameter values is second transmission parameter values; Perhaps selecting the probable value corresponding transmission parameter values adjacent with the probable value of first transmission parameter values is second transmission parameter values.
8. a node device is characterized in that, comprising:
Selected cell, the correspondence table that is used for and transmission parameter values interval from cable length is selected first transmission parameter values;
First transmitting element is used for first transmission parameter values selected according to selected cell, sends transmission signals to other node devices;
Receiving element is used to receive the transmission signals feedack that described other node devices send according to first transmitting element;
Determining unit is used for the information that receives according to receiving element, determines the transmission parameter values with described other node devices transmission The data.
9. the system of the transmission parameter values between a definite node device is characterized in that, comprising:
Sender node equipment, the correspondence table that is used for and transmission parameter values interval from the cable length of storage is selected first transmission parameter values, according to first transmission parameter values of selecting, sends transmission signals to receiving terminal node equipment; Receive receiving terminal node equipment feedack, and according to the transmission parameter values in the described correspondence table of the definite and described receiving terminal node transmission of described feedack The data;
Receiving terminal node equipment is used for the transmission signals that the receiving end/sending end node device is sent; Determine the intensity level of received signal; According to the intensity level of the received signal of determining, to sender node equipment feedback information.
10. system as claimed in claim 9, it is characterized in that, affiliated storage system is a serial attaching SCSI storage system, described receiving terminal node equipment is to sender node equipment feedback information, be specially: receiving terminal node equipment by the serial attaching scsi controller to sender node equipment feedback information, or by out-band method to sender node equipment feedback information; Or
Affiliated storage system is an optical-fibre channel FC storage system, described receiving terminal node equipment is to sender node equipment feedback information, be specially: receiving terminal node equipment by the FC controller to sender node equipment feedback information, or by out-band method to sender node equipment feedback information.
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| CN102158255B (en) | 2013-11-06 |
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Effective date of registration: 20221008 Address after: No. 1899 Xiyuan Avenue, high tech Zone (West District), Chengdu, Sichuan 610041 Patentee after: Chengdu Huawei Technologies Co.,Ltd. Address before: 611731 Area D, Building 5, High-tech Park, University of Electronic Science and Technology of China, No. 88, Tianchen Road, Qingshuihe Area, Western Park, High-tech Zone, Chengdu, Sichuan Province Patentee before: HUAWEI DIGITAL TECHNOLOGIES (CHENG DU) Co.,Ltd. |