System for live-migration and automated recovery of applications in a distributed system
First Claim
1. A method of balancing load in a cluster of servers hosting a plurality of applications, the method comprising:
- determining the current load of each server;
determining an average load taking into account the loads at the servers in the cluster;
determining for a server whether its load is less or greater than the average load plus a damping factor (Q);
making a decision to migrate an application from the server when its load is greater than the average plus the damping factor.
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Accused Products
Abstract
A method and apparatus for distribution of applications amongst a number of servers, ensuring that changes to application data on a master for that application are asynchronously replicated to a number of slaves for that application. Servers may be located in geographically diverse locations; the invention permits data replication over high-latency and lossy network connections and failure-tolerance under hardware and network failure conditions. Access to applications is mediated by a distributed protocol handler which allows any request for any application to be addressed to any server, and which, when working in tandem with the replication system, pauses connections momentarily to allow seamless, consistent live-migration of applications and their state between servers. Additionally, a system which controls the aforementioned live-migration based on dynamic measurement of load generated by each application and the topological preferences of each application, in order to automatically keep servers at an optimum utilization level.
56 Citations
14 Claims
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1. A method of balancing load in a cluster of servers hosting a plurality of applications, the method comprising:
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determining the current load of each server; determining an average load taking into account the loads at the servers in the cluster; determining for a server whether its load is less or greater than the average load plus a damping factor (Q); making a decision to migrate an application from the server when its load is greater than the average plus the damping factor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Computer software which, when executed by appropriate processing means, causes the processing means to implement a method of balancing load in a cluster of servers hosting a plurality of applications, the method comprising:
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determining the current load of each server; determining an average load taking into account the loads at the servers in the cluster; determining for a server whether its load is less or greater than the average load plus a damping factor (Q); making a decision to migrate an application from the server when its load is greater than the average plus the damping factor. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification