WO2005093573A2 - Verfahren zur redundanten datenhaltung in computernetzwerken - Google Patents
Verfahren zur redundanten datenhaltung in computernetzwerken Download PDFInfo
- Publication number
- WO2005093573A2 WO2005093573A2 PCT/EP2005/050980 EP2005050980W WO2005093573A2 WO 2005093573 A2 WO2005093573 A2 WO 2005093573A2 EP 2005050980 W EP2005050980 W EP 2005050980W WO 2005093573 A2 WO2005093573 A2 WO 2005093573A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- network
- application programs
- computers
- address
- computer
- Prior art date
Links
Classifications
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/35—Network arrangements, protocols or services for addressing or naming involving non-standard use of addresses for implementing network functionalities, e.g. coding subscription information within the address or functional addressing, i.e. assigning an address to a function
Definitions
- the invention relates to a method for redundant data storage in a computer network, in which data are stored consistently on at least two computers in a network.
- Computer networks have developed in recent years into an important communication medium through which a multitude of services are offered.
- the world's best-known computer network is the Internet, as the totality of all interconnected networks that use the Internet Protocol IP as the transport protocol is called.
- the Internet Protocol IP is responsible for the connectionless transport of data from a sender - possibly over several networks - to the recipient, whereby neither error detection nor error correction takes place.
- Transport protocols such as the Transmission Control Protocol TCP or User Datagram Protocol UDP are based on the Internet protocol.
- the Transmission Control Protocol TCP is a connection-oriented transport protocol that enables a logical, secure full-duplex point-to-point connection. It ensures that data packets are error-free and in the desired order underlying network can be transmitted according to the Internet Protocol IP.
- the User Datagram Protocol UDP enables connectionless point-to-point communication.
- the individual data packets (datagrams) are independent of each other.
- the transfer is not secured. This means that data packets can be lost and that the order of reception does not have to match the order of transmission. A possible backup of the
- UDP is generally used for simple services that expect a simple response (a datagram) to a simple request (a datagram).
- World Wide Web WWW World Wide Web WWW
- Audio sequences, still images and films can include ⁇ s using WWW browser, a local front-end software.
- the World Wide Web is based on the client / server principle, on which all important applications on the Internet, in addition to the WWW, FTP or news are based.
- applications designed according to the client-server principle use a client program that exchanges data with a specific service computer in the network - the server.
- the server is usually for the
- the Internet servers are operated either by commercial or non-commercial organizations, such as universities, which offer various online services, i.e. information services (weather reports, train schedules, news services) and communication services (e-mail, chat, forums), which are implemented using appropriate application programs.
- information services weather reports, train schedules, news services
- communication services e.g., chat, forums
- An essential criterion for the quality of a service offered is the probability with which a potential user can also use the service, the corresponding measure - which results from the downtime during a certain observation period - the so-called availability of this service has a significant influence on the service User satisfaction and thus the success of the respective service.
- the invention has for its object to provide an improved method for redundant data storage in computer networks. According to the invention, this is done with a method for redundant data storage in computer networks, in which data are stored consistently on at least two computers, the data storage provided
- Application programs of the at least two computers have a matching address identifier, which these application programs have as part of a virtual subnet of a computer network, and the mutually independent computers have routing functions via which the application programs are accessed.
- Transport protocols the Transmission Control Protocol TCP or the User Datagram Protocol UDP are used.
- the addressing in the computer network N shown is carried out according to the Internet Protocol Version 4 by the so-called IP (Internet Protocol) address, which uniquely identifies each network participant on level 3 of the OSI layer model, that is to say on a logical level.
- IP Internet Protocol
- the IP address is a 32-bit word which has a first area which is used for addressing the network and a second area by means of which the computer in the network is identified.
- the size of the two areas is standardized, we differentiate between 5 classes of IP addresses: - Class A networks with 7 bit network addressing and 24 bit for the subscriber address, - Class B networks with 14 bit network addressing and 16 bit subscriber addressing, - Class C networks with 21 bit network addressing and 8 bit subscriber address. - Class D for addressing within the network with 28 bit subscriber addresses and the class E reserved for research purposes
- the class of the IP address is shown in the leading bits, addresses of class A can be recognized by the fact that the leading bit has the value 0, class B by the value 10 of the two leading bits, class C by 110 of the first three bits, etc ,
- the routers of a network need the information about the address class in order to filter out the information about the address of the target network from the IP address of a target subscriber using the so-called netmask. While the network addresses are managed globally, the subscriber addresses are managed locally by the respective network operator. The latter also has the option of structuring his network by dividing it into subnets by assigning the subscriber addresses without using additional network numbers. To do this, the subscriber portion of the IP address is divided into a - subnetwork address and the - actual participant address divided.
- the IP address is then structured in three parts, it includes the network address, the subnet address and the actual subscriber address.
- a network of address class B is given as a simple example, in which the IP address has the binary number 10 in the leading two bits and a further 14 bits for the address of the network.
- the subscriber addressing part of 16 bits provided for this network class is in turn divided into an 8 bit part for addressing the subnets SN1, ... SN 25, ..., SN 255 and an 8 bit element for addressing the subscribers TN in the subnets.
- IP address In the generally used 4 octet notation of the IP addresses, in which the individual bytes (8 bits) are represented by decimal numerical values and separated by dots, a typical IP address looks as follows:
- the address of the network N itself is 172.16.0.0.
- the 254 possible nodes TN in the subnet SN 25 with the address 172.16.25.0 then have the following addresses: 172.16.25.1, ..., 172.16.25.254
- the data to be kept redundant are now stored on two mutually independent computers R1, R2 of the network N. stored consistently, with data matching between the redundant units being ensured using known methods. It is possible that the two computers R1, R2 belong to a network N of an operator or different interconnected networks of different operators.
- the associated application programs of the two computers are assigned a matching address identifier, which these application programs are part of a virtual one
- subnet SN 25 of a computer network N such as the number 172.16.25.0.
- the application program runs on a computer in this subnet SN 25, for example on a computer with the address 172.16.25.1.
- This virtual subnet SN 25 is logically connected to the overall network via two routers.
- the two mutually independent computers R1, R2, which, among other things, contain the application programs provided for the redundant and consistent storage of the data, are designed as routers, via which only the application programs - the virtual subnet - are accessed.
- the other routers of the networks contain in their entirety
- Routing tables therefore indicate that addresses of type 172.16.25.XXX, which relate to the virtual subnet SN 25, can only be reached via one of the two routers mentioned.
- the entry in the routing table of the other routers contains the network address 172.16.25.0
- Network mask 255.255.255.0 the cost of the route to this subnet and the interface through which this network N can be reached.
- All data packets with these destination addresses therefore get to one of the two routers and are sent from this to the corresponding application program with the associated memory area forwarded.
- the network N is equipped with a dynamic routing method, when one of the two application programs is occupied, the next request is automatically routed to the cheapest free memory area. If the two routers, via which the virtual subnet SN 25 can be reached, can be reached via equally expensive routes, one router is selected at random and thus a load sharing is carried out.
- the present exemplary embodiment describes the use of the invention in a computer network N with addressing according to IP protocol version 4, but the invention can also be used advantageously, for example, with IP protocol version 6. Likewise, the application of the invention is possible for all common transport protocols based on IP, such as TCP or UDP.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Hardware Redundancy (AREA)
- Multi Processors (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/593,684 US20070136468A1 (en) | 2004-03-23 | 2005-03-04 | Method for redundant data management in computer networks |
EP05716920A EP1741258A2 (de) | 2004-03-23 | 2005-03-04 | Verfahren zur redundanten datenhaltung in computernetzwerken |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004014195A DE102004014195B3 (de) | 2004-03-23 | 2004-03-23 | Verfahren zur redundanten Datenhaltung in Computernetzwerken |
DE102004014195.9 | 2004-03-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005093573A2 true WO2005093573A2 (de) | 2005-10-06 |
WO2005093573A3 WO2005093573A3 (de) | 2006-04-27 |
Family
ID=34745453
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/050980 WO2005093573A2 (de) | 2004-03-23 | 2005-03-04 | Verfahren zur redundanten datenhaltung in computernetzwerken |
Country Status (4)
Country | Link |
---|---|
US (1) | US20070136468A1 (de) |
EP (1) | EP1741258A2 (de) |
DE (1) | DE102004014195B3 (de) |
WO (1) | WO2005093573A2 (de) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0865180A2 (de) * | 1997-03-14 | 1998-09-16 | Lucent Technologies Inc. | Lastverteilung zwischen Servern in einem TCP/IP-Netz |
WO2000052906A1 (en) * | 1999-03-05 | 2000-09-08 | At & T Corporation | System, method and apparatus for network service load and reliability management |
WO2001035601A1 (en) * | 1999-11-10 | 2001-05-17 | Rainfinity, Inc. | Distributed traffic controlling system and method for network data |
US6647427B1 (en) * | 1999-03-26 | 2003-11-11 | Kabushiki Kaisha Toshiba | High-availability computer system and method for switching servers having an imaginary address |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6618377B1 (en) * | 1999-03-30 | 2003-09-09 | Cisco Technology, Inc. | Flexible scheduling of network devices within redundant aggregate configurations |
JP2001211190A (ja) * | 2000-01-25 | 2001-08-03 | Hitachi Ltd | 通信管理装置及び通信管理方法 |
US6944662B2 (en) * | 2000-08-04 | 2005-09-13 | Vinestone Corporation | System and methods providing automatic distributed data retrieval, analysis and reporting services |
US20030154236A1 (en) * | 2002-01-22 | 2003-08-14 | Shaul Dar | Database Switch enabling a database area network |
US7062517B2 (en) * | 2002-08-14 | 2006-06-13 | Hitachi, Ltd. | Method and apparatus for centralized computer management |
US7334218B2 (en) * | 2002-09-02 | 2008-02-19 | International Business Machines Corporation | Method for adaptively assigning of data management applications to data objects |
JP2004173136A (ja) * | 2002-11-22 | 2004-06-17 | Fujitsu Ltd | ネットワーク管理装置 |
US7779368B2 (en) * | 2004-10-30 | 2010-08-17 | Hewlett-Packard Development Company, L.P. | Systems and methods for presenting managed data |
US20060095705A1 (en) * | 2004-10-30 | 2006-05-04 | James Wichelman | Systems and methods for data storage management |
US8886778B2 (en) * | 2005-04-29 | 2014-11-11 | Netapp, Inc. | System and method for proxying network management protocol commands to enable cluster wide management of data backups |
-
2004
- 2004-03-23 DE DE102004014195A patent/DE102004014195B3/de not_active Expired - Fee Related
-
2005
- 2005-03-04 EP EP05716920A patent/EP1741258A2/de not_active Withdrawn
- 2005-03-04 US US10/593,684 patent/US20070136468A1/en not_active Abandoned
- 2005-03-04 WO PCT/EP2005/050980 patent/WO2005093573A2/de not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0865180A2 (de) * | 1997-03-14 | 1998-09-16 | Lucent Technologies Inc. | Lastverteilung zwischen Servern in einem TCP/IP-Netz |
WO2000052906A1 (en) * | 1999-03-05 | 2000-09-08 | At & T Corporation | System, method and apparatus for network service load and reliability management |
US6647427B1 (en) * | 1999-03-26 | 2003-11-11 | Kabushiki Kaisha Toshiba | High-availability computer system and method for switching servers having an imaginary address |
WO2001035601A1 (en) * | 1999-11-10 | 2001-05-17 | Rainfinity, Inc. | Distributed traffic controlling system and method for network data |
Also Published As
Publication number | Publication date |
---|---|
DE102004014195B3 (de) | 2005-08-11 |
WO2005093573A3 (de) | 2006-04-27 |
EP1741258A2 (de) | 2007-01-10 |
US20070136468A1 (en) | 2007-06-14 |
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