Disaster Tolerance and Recovery in a Serviceguard Cluster
Understanding Types of Disaster Tolerant Clusters
Table | Comparison of Disaster Tolerant Cluster Solutions | |||
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Attributes | Extended Distance |
| CLX | Continentalclusters |
Cluster |
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Key Benefit | Excellent in “normal” | Two significant benefits: | Increased data | |
| operations, and partial | • | Provides maximum | protection by |
| failure. Since all hosts | supporting unlimited | ||
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| data protection. | ||
| have access to both |
| distance between data | |
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| State of the data is | ||
| disks, in a failure |
| centers (protects | |
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| determined before | ||
| where the node is |
| against such disasters | |
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| application is | ||
| running and the |
| as those caused by | |
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| started. | ||
| application is up, but |
| earthquakes or violent | |
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| the disk becomes |
| If necessary, data | attacks, where an |
| unavailable, no failover |
| resynchronization is | entire area can be |
| occurs. The node will |
| performed before | disrupted). |
| access the remote disk |
| application is |
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| to continue processing. |
| brought up. |
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| • | Better performance |
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| than Extended |
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| Distance Cluster for |
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| resynchronization, |
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| as replication is done |
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| by storage |
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| subsystem (no |
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| impact to host). |
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Chapter 1 | 31 |
