Question about cluster

Hi Experts,

I need an explanation about cluster.
Can you explain the special drives from a cluster ?
Quorum etc.

On the Cluster Fileserver we have these drives : Quorum, Config, Data
On the Cluster Exchange2007 we have these drives : Quorum, Volume, Data
On the Cluster SQL we have these drives : Quorum, Config, SQLData, Trans

What is very important with these drives ?
Maybe you have some easy explanations about cluster´s
Eprs_AdminSystem ArchitectAsked:
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Carl TawnSystems and Integration DeveloperCommented:
The Quorum is a drive that is shared between all of the nodes in the cluster. It is used by Clustering Services to manage which nodes are active and which resource groups currently belong to which node.

The rest of your drives I imagine are LUNs pointing to an area of space on a SAN somewhere. These should typically be owned by a resource in the cluster and should only be available to a single active node at a time.
Eprs_AdminSystem ArchitectAuthor Commented:
ok the other drives are several lun´s from our storage, right.

The Quorum drive, is it the only one , needed in a clustered environment ?
Carl TawnSystems and Integration DeveloperCommented:
Yes. It is the only one that is absolutely required for the cluster to work. It needs to be available to all of the nodes - but it doesn't need to be particularly big. Most Quorum drives i've seen in the wild tend to be around 10GB.
Seth SimmonsSr. Systems AdministratorCommented:
The Quorum drive, is it the only one , needed in a clustered environment ?

all the drives need to be accessible to the cluster; the quorum (as mentioned) is required for the cluster itself to function.  the drives are shared meaning the cluster controls which node has ownership over the resource at any given time

the whole point of clustering is for high availability.  if something happens to one node and it crashes, the cluster service on the other node will detect the first node is no longer available and take ownership of resources

this should explain everything you wanted to know about quorum configurations

failover clustering in general (additional links at the bottom of this page for further reading)

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