大部分資料從 Wikipedia 查到的, 只是作筆記整理
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Cluster 的種類 :
1.High-availability (HA) clusters
2.Load-balancing clusters
3.Compute clusters
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Two-node cluster - A two-node cluster is the minimal high-availability cluster that can be built.
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Classification by role symmetry
1.Active/Passive
One node owns the services, the other one remains inoperative.
Should the primary node fail, the secondary or backup node takes the resources and reactivates the services, while the ex-primary remains in turn inoperative.
This is a configuration where only one node is operative at any point of time.
2.Active/Active
There is no concept of a primary or backup node: both nodes provide some service, should one of these nodes fail, the other must also assume the failed node's services.
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