How we Understand a Cluster

This is the good one I found on one of the MVP blog:

Clustering terms made easy
Clusters are Highly Available and should never be considered Fault Tolerant.

Highly Available = is when I come anytime my wife calls me.

Fault Tolerant = Marriage.

You don't want to be married to you SQL/Exchange Cluster :)

You do want it around whenever you need it though.
Active/Active = when your cluster is too busy for its own good.

Active/Passive = one worker, one manager, you decide which is which.

Node = Clustered computer, could also be the worker who sits in a cube, not to be confused with Dude.

Virtual Server = this is kind of like be on a telecom at work, only you are calling in from Hawaii and nobody knows.

Quorum = Cluster=Quorum, Quorum=Clustering.

Failover = the only time at work that you can fail and still be a hero.

Failback = great way to get fired, let your server failover without you controlling it (Don't confuse with the above term).

Cluster = when it fails, also known as a Cluster Fork, only fork is spelled funny - u c what I mean?


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