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MCCS is a high availability that can be configured with no distance limitation between nodes.
That means standby server can be easily configured on a remote site without extra charge.
Offers Offers Remote Management Web Console
MCCS allows user to use a web browser to control MCCS from a local server or remote server.
At each server, you can connect to the server where MCCS is configured. There is no need to configure an additional environment file.
(Default access URL is 'http://ipaddress:10080/main'.)
MCCS Configuration
MCCS Configuration is distinguished according to the disk configuration of data as listed below.
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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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Each local disk exists in each server and data is replicated real-time to the disk of another node.
Least unit of disk replication is in partition unit. (Recommended unit : LUN)
[Figure] Mirror Disk Environment
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It is similar to process. But this is more complicated. Application works with several application or scripts such as tomcat.
MCCS does only detect on execution file, but it also brings online/ take offline/monitor the process by using pre-defined script.
Shared Disk
MCCS monitors the status of I/O path for a node connected to the external shared storage.
Mirror Disk
When When there is no shared disk in a cluster, data is saved in local or the direct-connected storage.
In such an environment, TCP/IP based mirror components are used to copy the changed data.
Service
Service is a component that is managed by SCM (Service Control Management) of Window O.S.
Virtual Name
윈도우 기반 NetBIOS 이름을 관리합니다.
Linux Service Module.
SCSI-LOCK
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.