CN114079616A - Database redundancy method for non-hot standby disk array server - Google Patents
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- 230000006870 function Effects 0.000 claims abstract description 5
- 230000001360 synchronised effect Effects 0.000 claims description 7
- 238000013500 data storage Methods 0.000 abstract description 3
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- 238000004519 manufacturing process Methods 0.000 description 6
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0803—Configuration setting
- H04L41/0823—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability
- H04L41/0836—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability to enhance reliability, e.g. reduce downtime
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1446—Point-in-time backing up or restoration of persistent data
- G06F11/1448—Management of the data involved in backup or backup restore
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/17—Details of further file system functions
- G06F16/174—Redundancy elimination performed by the file system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0803—Configuration setting
- H04L41/0823—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability
- H04L41/0826—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability for reduction of network costs
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0893—Assignment of logical groups to network elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
Abstract
The invention aims to provide a database redundancy method of a non-hot standby disk array server, which comprises the following steps: configuring the initial RAID0 program server system to be consistent with the data server system; performing IP setting on a client and connecting to a program server; establishing a database table, and specifying rows and columns of the database; when writing the script, simultaneously connecting the database of the program server, and writing the information to be stored into the database of the program server for storage; self-checking the database, making the copy-distribution-merging release of the server data, and finishing the functions of self-checking, mutual checking and synchronization at specific time; and the data server is used as a slave station of the program server to complete program redundancy. The invention can utilize the high-performance RAID0 array to finish the storage of more data, meets the hot standby and switching of the data on the premise of high performance and high utilization rate, reduces the economic cost, and can be more widely popularized in the practical application of self-control data storage.
Description
Technical Field
The invention relates to a control method of an industrial control program, in particular to a redundancy method.
Background
The pharmaceutical industry, the food and beverage industry, the refrigeration industry, the monitoring industry and the automatic production line have new requirements on the intellectualization and the informatization level of the system. The historical curve of the instrument equipment is used for monitoring the change of the production state, the operation records are used for tracing whether the operation rules of field staff meet requirements, the production report is used for recording whether the automatic control standardization meets the regulations, the alarm records are used for verifying the faults of key equipment, and the faults can not leave the support of a large amount of data, the traditional solution mode ensures the stability of the data through a disk array RAID1 mode, but the problem is very large, namely, the system calling cost is overlarge, the utilization rate of a disk is poor, the utilization rate is only 50%, the random/continuous read-write performance can be reduced, the cost is extremely high, except for the current RAID1 solution mode, the hard disk has three common modes, but the work which cannot be completed by RAID1, and the following three modes are introduced as follows:
1.RAID 0
also known as Stripe or Striping, represents the highest storage performance across all RAID levels. The principle of improving storage performance of RAID0 is to distribute continuous data to multiple disks for access, so that a system with data requests can be executed by multiple disks in parallel, each disk executing its own portion of the data request. The parallel operation on the data can fully utilize the bandwidth of the bus, obviously improve the overall access performance of the disk, has the lowest redundancy and the best performance and cost, but cannot realize the data intercommunication in the method.
2.RAID 5
A storage solution is provided that is compatible with storage performance, data security, and storage cost. RAID5 does not back up the stored data, but stores the data and corresponding parity information on the individual disks making up RAID5, and the parity information and corresponding data are stored on different disks, respectively. When a disk of RAID5 is corrupted, the remaining data and corresponding parity information are used to recover the corrupted data. RAID5 may be understood as a compromise between RAID0 and RAID 1. RAID5 may provide data security for the system, but the security level is lower than that of Mirror and the utilization rate of disk space is higher than that of Mirror. RAID5 has a data read rate similar to RAID0, but with one more parity information, and writes data at a slower rate than a single disk write operation. Meanwhile, as a plurality of data correspond to one parity check information, the utilization rate of the disk space of RAID5 is higher than that of RAID1, and the storage cost is relatively low. The method is a solution which is most consistent with the method in terms of hardware implementation, but the cost is higher than that of RAID0 storage, and the number of hard disks is more.
3.RAID0+1
Just as its name implies, RAID 0+1 is a combination of RAID0 and RAID1, also known as RAID 10. RAID 0+1 is a solution that takes storage performance and data security into account. It provides similar storage performance to RAID0 while providing the same data security as RAID 1. Because RAID 0+1 also provides data security guarantee through 100% backup of data, the disk space utilization rate of RAID 0+1 is the same as that of RAID1, and the storage cost is high. The characteristic of RAID 0+1 makes it especially suitable for the fields that a large amount of data need to be accessed and the requirement on data security is strict, such as banks, finance, commercial supermarkets, warehouse warehouses, various file management and the like.
Disclosure of Invention
The invention aims to provide a database redundancy method of a non-hot standby disk array server, which can ensure that effective storage can be simultaneously completed in an environment with large storage capacity in an industrial control system.
The purpose of the invention is realized as follows:
the invention discloses a database redundancy method of a non-hot standby disk array server, which is characterized by comprising the following steps:
(1) configuring the initial RAID0 program server system to be consistent with the data server system;
(2) the method comprises the steps that IP setting is carried out on a client, the client is connected to a program server, a redundant server is added into the program server, configuration is reserved, a data server is reserved for redundancy configuration, and only the program server is changed during actual debugging;
(3) establishing a database table, and specifying rows and columns of the database, wherein each column is a dimension for storage;
(4) when writing the script, simultaneously connecting the database of the program server, and writing the information to be stored into the database of the program server for storage;
(5) the database is self-checked, the functions of self-checking, mutual checking and synchronization are completed at a specific time after the data of the server is copied, distributed, merged and issued, and the correct data written in the database is synchronized to the database with missing data according to the command of the last synchronization, so that redundant synchronization is completed;
(6) and the data server is used as a slave station of the program server to complete program redundancy.
The present invention may further comprise:
1. in the process of establishing a database table, after a complete data server data packet is established, data needing redundancy is exported and imported into a program server.
2. When the script is written, the Time of the server is uniformly configured, the CMD command enters a system command symbol, a uniform Time is obtained through a series of languages under the SET Time command, or the Time server performs uniform Time calling, and corresponding configuration is also made for the distributed client.
3. In the process of program redundancy, program redundancy configuration is carried out in a program script, redundancy configuration is carried out on a history curve and alarm information carried by the program script, the state of a current client reading server is read through the script, when the current reading program is detected to be not a program server, a data server program sends out an alarm, when any server has a problem, a background script detects in real time or at regular time to determine that the server has a normal state, and the alarm is operated circularly.
The invention has the advantages that: by means of database software distribution and subscription, the problems of high storage cost and low disk space utilization rate are solved, effective hot standby similar to a RAID1 mode is achieved in RAID0 configuration, storage of more data can be completed by means of a high-performance RAID0 array, hot standby and switching of the data are met on the premise of high performance and high utilization rate, economic cost is reduced, and the method can be widely popularized in the practical application of automatic control data storage.
Drawings
FIG. 1 illustrates a data recording manner of a conventional RAID data server;
FIG. 2 is a diagram illustrating a RAID redundancy server data recording method according to the present invention;
FIG. 3 is a flowchart illustrating a sequential implementation of RAID redundancy in accordance with the present invention;
FIG. 4 is a diagram illustrating the writing of device parameters;
FIG. 5 is a schematic diagram of a setup for redundant distribution;
fig. 6 is a schematic diagram of the recorded data of the server 1;
fig. 7 is a schematic diagram of the recorded data of the server 2.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
with reference to fig. 1-7, the present invention combines Wincc with SQL Server through VBS language, and regularly completes important data hot backup and verification through SQL data publishing and subscribing functions, thereby achieving high utilization rate, high performance, and low cost of completing redundancy work without RAID1 array, and achieving a solution of optimal solution through software under four traditional data backup situations, as shown in fig. 2.
The method can be configured according to the flow shown in the following diagram, as shown in fig. 3, and is described in detail according to each step of the flow diagram:
(1) the initial RAID0 program server system is configured consistent with the data server system: although the application of the Server is different, in actual use, in order to ensure the stability of the system, a system program can read and write a database account, the system configuration of the required Server (such as Windows Server series), the database system (such as SQL Server series), the system configuration of the automatic control engineering software (such as Step7 series), the system configuration of the human-computer interface (Wincc series) and the message queue of the Nestreamwork 3.5 and (MSMQ) Server are required to be installed before the system configuration.
(2) After the client installs the software, the IP setting can be carried out on the client, the client is connected to the program server, a redundant server is added in the program server and configuration is reserved (a data server is reserved for redundant configuration), and only the program server is changed during actual debugging; so far, the configuration of the non-redundant program is completed, and when the program server is required to complete the work of the redundant synchronous database, the operation is required to be carried out according to the following steps;
(3) taking microsoft's SQL Server as an example, when we read and write a data Server, we need to establish a database table according to requirements, and specify rows and columns of the database, each column is a dimension that we need to store, for a conventional autonomous system, we only need to compile the table according to User Requirements (URS) to complete conventional data reading operation, but when a major problem occurs in the data Server, which causes damage to a hard disk, a RAID0 disk cannot complete data protection, which causes huge economic loss, and therefore after we establish a complete data Server data packet, important data that needs redundancy is exported and imported to a program Server, so far, the redundancy configuration of us has been initially established.
(4) When a daily program works, such as login operation of a user, a system records information of a user name, login Time and the like currently logged in through a script in the background, the user needs to be connected with a database of a program server at the same Time in the writing process (the user name of the computer is recommended to be regular and can be circulated, and the configuration is the same), the same important information is written into the database of the program server for storage, and the Time of the server needs to be uniformly configured when being written, because the Time has important influence on rigor and reality of data, the user needs to enter a system command symbol through a CMD command, obtain a uniform Time through a series of languages under an SET Time command, or purchase a Time server (such as Beidou) for uniform Time calling, and corresponding configuration should be made for a distributed client.
(5) After the database reading and writing are completed by using the script, the server is successfully used for completing the distribution of the data packet, but an important problem needs to be solved, namely the self-verification of the data is completed. In actual use and production, information loss occurs during reading and writing due to reading and writing Bug of the system along with network instability, if two scripts execute writing simultaneously, the commands are carried out under the same frame with extremely low probability, the commands are lost, at the moment, if copying, distributing, merging and issuing of server data are carried out, self-checking, mutual checking and synchronization functions can be completed at specific time, and the system can synchronize correct data written in a database to the database of the missing data according to the last synchronous command to complete real redundant synchronization.
(6) Finally, a data server is taken as a slave station of the program server to complete program redundancy, firstly, a program redundancy configuration is made in a program script, a redundancy switching configuration is made for the program in the human-computer interface software of Siemens, some settings are needed, the settings carry out redundancy configuration on a history curve and alarm information carried by the data server, although the program is internally synchronized, the offline detection cannot be completed, for this reason, the current client machine reading state of the server is required to be read through the script, when the current read program is detected not to be the program server, the data server program can send out an alarm sound, here, the data server can be connected with a section of alarm audio, when any server has a problem, the background script detects in real time or at regular time to determine that the server is in a normal state, and the voice alarm audio is circularly operated, the system problem can be solved at the first time, and the loss is reduced to the minimum.
Introduction to examples
An automatic system for extracting Chinese medicine from Guilin pharmaceutical company is composed of 26 typical 6T extracting pots, 6 effective concentrators and 4 double-effect concentrators. Each device comprises a history curve of a plurality of instruments needing temperature, pressure, liquid level and the like, the production start and end time of a key process can be recorded in each production, and taking the water adding of the device as an example, when an automatic control system starts to add water, the automatic control system links a database, is connected to a data server, and writes a group of data. As shown in fig. 3.
According to fig. 3, only one server writes a program, and if the RAID1 mode is not established, when a system fails or equipment is maintained, the data cannot be read, so that the previous record can be linked to other data servers through VBS software, and the same piece of data is written, the method is similar to copy and paste, but actually different, there is a very small probability that time is out of synchronization or other bugs occur in the actual running process of the script, which cannot be avoided in the debugging process, and at this time, a data check needs to be performed on the script, that is, the data is merged and issued in the database.
The merging and releasing of the data base do not have a real master server and a slave server, the distribution of the data base can carry out merging and verification according to the set time frequency, and finally complete records are synchronized to the servers on two sides, namely when the VBS is written into a certain server and a Bug appears, the last correct condition can be synchronized to each released server to complete a task, and the reliability is higher than that of RAID5 in terms of results.
The merging and publishing data server needs preparation work:
the server configuration is the same;
the hard disk spaces are the same;
the SQL Server versions are the same, and the Server systems are the same;
the server makes a RAID0 array.
After the following conditions are completed, the setting is made such that copy-publish-merge-publish is clicked under the database management, as shown in fig. 4.
The distribution setting can be seen in the SQL Server management library using description in detail, the Server 1 and the Server 2 are distributed in a peer-to-peer mode in the setting, and the distribution has the advantage that the database needing to be copied and distributed can be selected for distribution, so that the utilization rate of the system is greatly improved, and the problem of accumulation and storage of redundant or unimportant data is solved.
The use of server data is basically completed but there is a problem that when the main server is in maintenance state, the system cannot automatically identify and switch the cold standby machine as the main server, at this time, the special value or some special codes of the database can be read through the VBS script to identify the current server operation state, when the previous main server is in non-operation state, the system lists the current automatically read device as the main data server, and after the next time the main server is connected in parallel to the system, the linked main server is switched through the VBS script, taking the traditional Chinese medicine factory as an example, the computer of the factory is configured with 1 program server (RAID0), 1 data server (RAID0), 1 engineer station, 5 operator stations, through the scheme, the VBS script in the siemens automatic control software is written/read in real time into/from the server, and is combined and checked at an interval of one hour every day, the comparison between the program server (server 1) and the data server (server 2) is shown in fig. 5 and 6:
so far, data redundancy is realized through the method. By the mode, more data can be stored by using the high-performance RAID0 array, hot standby and switching of the data are met on the premise of high performance and high utilization rate, economic cost is reduced, and the method can be widely popularized in the practical self-control data storage.
Claims (4)
1. A method for redundancy of a database of a non-hot standby disk array server is characterized by comprising the following steps:
(1) configuring the initial RAID0 program server system to be consistent with the data server system;
(2) the method comprises the steps that IP setting is carried out on a client, the client is connected to a program server, a redundant server is added into the program server, configuration is reserved, a data server is reserved for redundancy configuration, and only the program server is changed during actual debugging;
(3) establishing a database table, and specifying rows and columns of the database, wherein each column is a dimension for storage;
(4) when writing the script, simultaneously connecting the database of the program server, and writing the information to be stored into the database of the program server for storage;
(5) the database is self-checked, the functions of self-checking, mutual checking and synchronization are completed at a specific time after the data of the server is copied, distributed, merged and issued, and the correct data written in the database is synchronized to the database with missing data according to the command of the last synchronization, so that redundant synchronization is completed;
(6) and the data server is used as a slave station of the program server to complete program redundancy.
2. The method of claim 1, wherein the method comprises: in the process of establishing a database table, after a complete data server data packet is established, data needing redundancy is exported and imported into a program server.
3. The method of claim 1, wherein the method comprises: when the script is written, the Time of the server is uniformly configured, the CMD command enters a system command symbol, a uniform Time is obtained through a series of languages under the SET Time command, or the Time server performs uniform Time calling, and corresponding configuration is also made for the distributed client.
4. The method of claim 1, wherein the method comprises: in the process of program redundancy, program redundancy configuration is carried out in a program script, redundancy configuration is carried out on a history curve and alarm information carried by the program script, the state of a current client reading server is read through the script, when the current reading program is detected to be not a program server, a data server program sends out an alarm, when any server has a problem, a background script detects in real time or at regular time to determine that the server has a normal state, and the alarm is operated circularly.
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