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Standalone Mode
필요성
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Necessity
MCCS intends to provide interruption-free service by dualizing the server.
However, during service operation, as some nodes experience physical failures or OS failures, nodes may be unable to perform heartbeat communication with each other.
MCCS agents works as a pair. If they don't work as a pair, all operation by MCCS such as web console access will be failed. As a result, stand alone execution will be done.
In this situation, only one server is used for MCCS service, and you need to switch to the stand alone mode.
How to use Standalone Mode
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If mirror resource is included, it is limited to auto action in one node for user data safety. Therefore, according to the situation, there are 2 actions according to the existence of mirror resource.
<When Mirror disk resources is not included> included>
| NO. | Circumstances | AutoStart group according to Auto Start setting value | Start Group Manually |
|---|---|---|---|
| 1 | When boot one node while both nodes are offline | Able | Able |
| 2 | When boot in one node configuration | Able | Able |
| 3 | When two servers are booted and running - When MCCS is started in only one node while MCCS is terminated in both nodes (Apply only when Standalone option is given) | Disabled | Able after remove auto disable function |
| 4 | When two servers are booted and running - When MCCS is terminated in one node while MCCS is executing in both nodes | N/A | Able after remove auto disable function |
| 5 | When two servers are booted and running - When one node is terminated with MCCS is executing in both nodes | N/A | Able |
<When Mirror disk resources is included>
| No. | Circumstances | AutoStart group according to AutoStart setting value | Start Group Manually |
|---|---|---|---|
| 1두 노드가 종료된 상태에서 한 노드만 부팅할 때 | When boot one node while both nodes are offline | Disabled | Able after remove auto disable function |
| 2 | 두 서버가 부팅되어 운영 중일 때 - 양 노드에서 MCCS 가 종료된 상태에서 한 노드에서만 MCCS 가 시작 될 때 (Apply only when Standalone option is given) | Disabled | Disabled |
| 3두 서버가 부팅되어 운영 중일 때 - 양 노드에서 MCCS 가 실행중인 상태에서 한 노드에서만 MCCS 가 종료되었을 때 | When two servers are booted and running - When MCCS is terminated in one node while MCCS is executing in both nodes | N/A | Able after remove auto disable function |
| 4두 서버가 부팅되어 운영 중일 때 - 양 노드에서 MCCS 가 실행중인 상태에서 한 노드가 종료할 때 | When two servers are booted and running - When one node is terminated with MCCS is executing in both nodes | N/A | Able |
스탠드얼론 모드의 해제 절차
문제가 있었던 서버가 정상 상태로 돌아오면 서버 관리자는 스탠드얼론 모드를 해제하고, 다음과 같이 서버 이중화 작업을 다시 진행해야 합니다.
MCCS 에이전트 서비스를 중지하거나 재시작해도 운영 중인 서비스에는 어떠한 영향도 없습니다.
스탠드얼론 모드의 해제 절차는 다음과 같습니다.
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Steps to remove Standalone Mode
When the server with problem is back to normal, server operator should remove Standalone mode and continue server redundancy process as shown below.
Operating services will not be affected by MCCS agent being stopped and restarted. Steps to remove Standalone mode are shown below.
- Stop the MCCS service on the server that had problem.
- Stop the MCCS service on server that had problem.
- Delete '-standalone' in MccsServer.ini file and save on active server.
- Start MCCS agent service on active server.
- Start the MCCS agent service on the server that had problem.
- Connect to MCCS console and check the state of MCCS service.