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13 Cards in this Set
- Front
- Back
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What is a cluster?
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A group of connected whole computers that work together as a unified computing resource.
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What is a node?
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Computers in a cluster are called nodes.
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What is a whole computer?
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A system that can run on its own, apart from the cluster.
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Benefit #1 of clustering?
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Absolute scalability as the cluster can have hundreds of machines, each as a multi-processor.
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Benefit #2 of clustering?
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Incremental scalability as its is possible to add new systems to the cluster in increments as needed.
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Benefit #3 of clustering?
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High availability as failure of one node is not critical to the system.
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Benefit #4 of clustering?
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Superior price and performance.
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List the five types of clustering
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1. Passive standby
2. Active secondary 3. Separate servers 4. Servers connected to disks 5. Servers share disks |
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Describe passive standby
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Secondary server takes over if primary fails
Easy to implement High cost |
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Describe active secondary
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Secondary server also used for processing tasks
Reduced cost Increased complexity |
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Describe separate servers
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Separate servers = separate disks
Data continuously copied from primary to secondary server High availability High network and server overhead due to constant copying of data |
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Describe servers connected to disks
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Servers are cabled to same disks; one server fails, other server controls its disks
Reduced network and server overhead Requires RAID in case of disk failure |
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Describe servers share disks
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Multiple servers share disks
Reduced risk of downtime in case of disk failure Requires lock manager software and RAID technology |
