I am running Windows 2008 R2 and want to cluster two physical servers with a SAN for storage.
I read the following from: http://technet.microsoft.com/en-us/library/ff182359(WS.10).aspx
"The disk witness is a disk in the cluster storage that is designated to hold a copy of the cluster configuration database. A disk witness is part of some but not all quorum configurations, and it is recommended for most clusters with an even number of nodes."
I have not been able to get any meaningful detail on the second sentence.
Do I need a separate physical disk on my SAN if I want to setup failover clustering?
I've seen references to quorum disk and witness disk in this context? Are they the same thing?
I've also seen references to "file share witness' as an alternative to a quorum or witness disk. What exactly is this? Does this substitute in some way for the quorum/witness disk?
Is it that I ultimately need at least one of these alternatives to have a cluster?
I did set up a cluster to the point where everything seemed to be working but I do not recall ever dedicating a disk to be a quorum or a disk witness or a file share witness or anything else - there was one disk in the SAN and all I recall doing was formatting it.