EP2198369A1 - Mit redundanz ausgestattetes verteiltes computersystem mit serverfunktionalitäten - Google Patents
Mit redundanz ausgestattetes verteiltes computersystem mit serverfunktionalitätenInfo
- Publication number
- EP2198369A1 EP2198369A1 EP08785632A EP08785632A EP2198369A1 EP 2198369 A1 EP2198369 A1 EP 2198369A1 EP 08785632 A EP08785632 A EP 08785632A EP 08785632 A EP08785632 A EP 08785632A EP 2198369 A1 EP2198369 A1 EP 2198369A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- redundant
- server
- services
- functionality
- service
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; 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
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
- G06F11/202—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where processing functionality is redundant
- G06F11/2035—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where processing functionality is redundant without idle spare hardware
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; 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 operations
- G06F11/1479—Generic software techniques for error detection or fault masking
- G06F11/1482—Generic software techniques for error detection or fault masking using middleware or operating system [OS] functionalities
- G06F11/1484—Generic software techniques for error detection or fault masking using middleware or operating system [OS] functionalities involving virtual machines
Definitions
- the invention relates to a distributed computer system with a plurality of physical computers, each having the functionality of a server. Such computer servers are each equipped with the functionality for at least one particular service. Furthermore, the invention relates to a method for installing redundant server functionalities in a distributed computer system.
- Computer servers have a certain probability of failure, conditionally e.g. through the wear of their included hardware.
- other types of computers such as clients, may be included in the distributed computer system, however, as the invention focuses on servers, it will not discuss other types of computers here.
- the servers can be designed to be redundant in a distributed computer system.
- a known concept of a redundant system is shown in FIG.
- a non-redundant output system with a number n of servers Si, S 2 , S 3 to S n is shown in the upper part of the drawing, which are each set up for one of n services D a , D b , D c to D n .
- a redundant target system is shown, whereby those servers whose services are implemented redundantly in the system are present twice in the system.
- the servers S ( n + 1 ) to S ( n + n ) installed in addition to the primary servers Si to S n are set up for the redundantly installed services D 3 1 to D n "The redundant services D a " to D n 1 are in such a system z. B. logically involved according to a fail-over concept, so that in case of server failure automatically a transition to the appropriate server.
- the invention is therefore based on the object of specifying a redundant server system that can be implemented with less effort.
- the invention proposes a distributed computer system which contains at least two physical computers. At least one of the computers is equipped with the functionality of two servers, with one of the two servers being installed as a virtual machine in the computer.
- the two servers of each computer designed in this way are set up for two different services. In each case one of the two services is a service installed redundantly in the computer system. If a redundant server is to be present for all services, a virtual machine must be installed in all computers.
- the prerequisite for the feasibility of the invention is that the physical computers used for redundant functions are each sufficiently powerful to additionally operate a virtual machine.
- the computer system according to the invention has a number of advantages:
- the proposed solution for creating redundancy by means of virtual machines makes it possible to reduce the probability of failure for installed services without having to install additional physical computers.
- the improved probability of failure thus achieved is higher in the redundant system according to the invention than in the known redundant systems described above, in particular if additional physical computers are to be dispensed with.
- redundancy will be created for all installed services by means of virtual - or additionally physical - machines, but depending on the importance of the services, it may also provide redundancy for only some of the services.
- a preferred method for installing redundant services in virtual machines uses so-called service cloning. It goes without saying, however, that alternatively a service can also be installed from scratch in a virtual machine.
- FIG. 1 shows an embodiment of a redundant server system according to the prior art
- FIG. 2 shows an embodiment of a redundant server system according to the invention
- Fig. 3 is a comparative representation of the probability of failure for a service in differently designed server systems.
- FIG. 2 shows in the upper drawing area a non-redundant output system with servers S 1, S 2 , S 3 to S n , which corresponds to the representation in FIG are each set up for one of the services D a , D b , D c to D n .
- the letter n also stands for the number of existing servers or services.
- the servers S 1 , S 2 , S 3 to S n are additionally each a virtual machine in addition to one of the original services D 3 , D bl D c to D n to provide redundancy V with a redundant service installed therein, namely one of the services denoted by D a ', D b 1 to D n 1 services.
- FIG. 2 also shows three steps for explaining a preferred procedure for installing the redundant services between the systems shown in the drawing above and below-and already explained above.
- a virtual machine V is initially installed on another server, in this case the second server S 2 , in step 1.
- a clone D a 'of the first service D 3 is created and migrated to the virtual machine V of the second server S 2 .
- "Cloning" here means that a copy is created, the copy D 3 1 having the same functionality as the first service D 3.
- the functionality of D 3 ' may also be installed from scratch in the virtual machine.
- step 3 the virtual machine V of the second server S 2 is added logically as a redundant server for the service D 3 , ie as a new computer with its own identity to the computer system. So that the copy of D a does not just exist twice in the distributed system, but rather works like a new computer with its own identity as a redundant part to its original, the copy here may still be configured or adapted accordingly.
- steps 1 to 3 are carried out for each service , so that, as a result, in the first server Si the services D 3 and D n 1 , in the second server S 2 the services D b and D a ⁇ in the third server S 3 the services D c and D b ⁇ and so on until finally in the n-th server S n the services D n and D (ni) 'are installed.
- a redundant server functionality D a 'to D n' can thus be installed on a respective other computer Si to S n for each service D a to D n .
- redundancies can be limited to only certain selected services.
- FIG. 3 shows a representation of the likelihood that one of the services installed in a system will fail, thereby affecting the overall functionality of the distributed system.
- the calculated example compares three different systems and it is assumed that both physical and virtual machines have a default probability of 20% per machine. To be compared:
- a redundant system with two physical computers S each having the server function for two primary services D a and D b , the computers S each containing a virtual machine V with an installed redundant service D a 'or Db 1 , and
- the illustration shows that for the non-redundant system a default probability for one of the services of 36.00% was calculated.
- the corresponding failure probability is only 7.84% in the known redundant system with four physical computers.
- the probability of failure with 10.84% is somewhat higher than in the known redundant system, but is to be regarded as a good compromise if it is to be dispensed with additional physical computer.
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Quality & Reliability (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Hardware Redundancy (AREA)
- Multi Processors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007041651A DE102007041651A1 (de) | 2007-09-03 | 2007-09-03 | Mit Redundanz ausgestattetes verteiltes Computersystem mit Serverfunktionalitäten |
| PCT/EP2008/006819 WO2009030363A1 (de) | 2007-09-03 | 2008-08-20 | Mit redundanz ausgestattetes verteiltes computersystem mit serverfunktionalitäten |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2198369A1 true EP2198369A1 (de) | 2010-06-23 |
Family
ID=40149755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08785632A Ceased EP2198369A1 (de) | 2007-09-03 | 2008-08-20 | Mit redundanz ausgestattetes verteiltes computersystem mit serverfunktionalitäten |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20100205474A1 (de) |
| EP (1) | EP2198369A1 (de) |
| CN (1) | CN101796490A (de) |
| DE (1) | DE102007041651A1 (de) |
| WO (1) | WO2009030363A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2787401B1 (de) | 2013-04-04 | 2016-11-09 | ABB Schweiz AG | Verfahren und Vorrichtung zur Steuerung einer physikalischen Einheit in einem Automatisierungssystem |
| JP7239828B2 (ja) * | 2019-08-02 | 2023-03-15 | 富士通株式会社 | システム管理方法、システム管理プログラム、およびシステム管理装置 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6609213B1 (en) * | 2000-08-10 | 2003-08-19 | Dell Products, L.P. | Cluster-based system and method of recovery from server failures |
| GB0112781D0 (en) * | 2001-05-25 | 2001-07-18 | Global Continuity Plc | Method for rapid recovery from a network file server failure |
| US7139925B2 (en) * | 2002-04-29 | 2006-11-21 | Sun Microsystems, Inc. | System and method for dynamic cluster adjustment to node failures in a distributed data system |
| JP4448719B2 (ja) * | 2004-03-19 | 2010-04-14 | 株式会社日立製作所 | ストレージシステム |
| US20060155912A1 (en) * | 2005-01-12 | 2006-07-13 | Dell Products L.P. | Server cluster having a virtual server |
| JP4544146B2 (ja) * | 2005-11-29 | 2010-09-15 | 株式会社日立製作所 | 障害回復方法 |
-
2007
- 2007-09-03 DE DE102007041651A patent/DE102007041651A1/de not_active Ceased
-
2008
- 2008-08-20 EP EP08785632A patent/EP2198369A1/de not_active Ceased
- 2008-08-20 WO PCT/EP2008/006819 patent/WO2009030363A1/de not_active Ceased
- 2008-08-20 CN CN200880105417.7A patent/CN101796490A/zh active Pending
-
2010
- 2010-03-02 US US12/715,814 patent/US20100205474A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009030363A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101796490A (zh) | 2010-08-04 |
| WO2009030363A1 (de) | 2009-03-12 |
| DE102007041651A1 (de) | 2009-03-05 |
| US20100205474A1 (en) | 2010-08-12 |
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| DAX | Request for extension of the european patent (deleted) | ||
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