If your servers are failing over randomly, a heartbeat interruption could be the cause.
Mount Points
New to SQL Server 2005 clustering are mount points. Actually, mount points existed in
Windows Server 2000 but were not supported for clustering. Windows Server 2003 and
SQL Server 2005 mount points are finally supported for SQL Server features.
Mount points are far more common in Unix-based systems; in Windows, a mount
point refers to the area of a disk drive that is bound to a drive letter. (Yes, I know this definition
isn??™t exactly right, but it??™s close enough for discussion purposes.)
CHAPTER 7 n CLUSTERING 179
Each drive letter has to have a base drive letter and directory location, but this base
location can be bound to any point on the disk. Imagine you have a C: partition on a
RAID 10 array. You could create additional partitions that are simply locations on C:, as
shown in Table 7-1.
Table 7-1. Drive Letters Bound to Various Mount Points on a Single Disk
Drive Letter Points To
E: C:\Exchange
F: C:\SQL2005
G: C:\UserData
Each drive acts as if it were a completely separate drive partition as far as both the
user and the clustering service are concerned.
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