BUILDING HIGHLY AVAILABLE CLUSTERED SOLUTIONS FOR MISSION CRITICAL APPLICATIONS
GFS-enabled high availability cluster implements allows a number of server nodes sharing data among themselves to provide continuity of service in the event that one or more nodes are failing. This advanced technology implements a shared filesystem between all the nodes involved in this cluster. The Global File System is a clustered filesystem that permits a cluster to maintain a single copy of data at all time for read and write operation. The benefit is that for any given number of failing nodes in the cluster, the nodes remaining operational will continue services while using the same sets of data as maintained by the GFS.
THE LINUX VIRTUAL SERVER AND LOAD BALANCING
Implementation of load-balancing capabilities for clusters of computer systems is a very effective way to maintain availability of services and adequate performance in the event of excessive load. The Linux Virtual Server project uses a very wide variety of routing algorithms in order to attribute load among cooperating servers.
BUILDING REDUNDANT SERVICES IN THE EVENT OF DISRUPTION
Providing fail-over across remote geographical location. Various high available deployment scenarios require the fail over capability to be implemented remotely. In the event of a server failure at one location, server(s) located at a different geographical location (across the street, in another continent..) would be able to immediately start service to mitigate for the initial loss of availability. This contingent requirement is mainly envisioned as part of continuity of services in the event of a disaster. Using Linux extensive networking resources along with server replication services, our professional implementation services will allow you to build redundant services availability over widely dispersed location.
ADDING MISSION CRITICAL TO SAMBA
CTDB is a feature that allows Samba to deliver highly available fail-over file storage NAS system leveraging on a shared cluster filesystem across all the nodes in the cluster to provide mission critical high availability.
The CTDB nodes in a cluster designates one node as a recovery master through an election process. If the recovery master node fails a new election is initiated so that the cluster will always guarantee there will be a recovery master. The setup requires a recovery master that monitor the cluster nodes contain for inconsistent configuration leading to the recovery process. The recovery process takes less than 3 seconds to reset the TDB database into a consistent stage.
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