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MCCS (Mantech Continuous Cluster Server) is a high-availability solution for mission-critical computing systems developed by Mantech.
 It is a highly available solution that resolves the problems with general failure such as natural disasters, or system failures, or unexpected service interruptions caused by terrors, forced occupation or an operator's mistakes and provides the system availability to maintain the service.
Normal business of companies in our current industries is conducted in computers, and most of the core information for this needs continuous service on a 24/7 basis. Mission critical systems require no downtime server infrastructure, but you will meet many types of service failures which bring in negative business impacts. 
MCCS solves these problems and provides a high-availability solution for missions-critical systems.

 

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In a generic application environment, data needed for service is not in the system that has cluster but exists in other system.
ㅇSince data does not exist, there is no need to configure disk resource. Only application program exists in general in this environment.

[Figure] Basic Application Environment

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Shared disk (SCSI or SAN) is connected to both servers physically. 
MCCS attaches the file system on shared disk to the only active server and lock to the standby server to prevent file system corruption.

[Figure] Shared Disk Environment

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SCSI-LOCK uses SAN protocol which is called SCSI-3 PR(Persistent Reservation). 
This is needed to prevent any data corruption which enable only one node can access a disk volume in environment where disk volumes are shared between nodes. 

Oracle database

This resource controls the Oracle database.
It detects the Oracle database installed on the system, controls the service and monitors the status.

Oracle Listener

This resource controls the listener process of the Oracle DB.


Resource Group

Resource group is a set of resources with dependency and MCCS failover the entire resources in a group. 
For example, to manage the ORACLE service by MCCS, IP address that is connected by client, network interface card, disks which database is stored, ORACLE listener and server service must be enclosed by a unit which is called as Group. 
Group should be configured as IP address dependent on network interface card, ORACLE server dependent on disk where database is stored, ORACLE listener dependent on ORACLE server to provide proper service.
IP address cannot be assigned without network interface card, process related to ORACLE can be bring online after disk completed online. If there is more than a group defined on a cluster, one group will failover without affecting the other groups.
There are two types, parallel and failover group, according to the service.
Please refer to "5. Resource Group of MCCS User Guide" for more details about parallel and failover group.