Table 1: Primary Features of Exchange 2007 High-Availability Options
High-Availability Solution |
Redundancy Offered |
Failure Point |
Backups |
Additional Information |
SCC |
System only |
SG* |
Daily full backups |
Cluster solution with automatic failover |
CCR |
System and Data |
None |
Weekly full backups with daily incremental backups; backup on the passive side by using VSS |
Cluster solution with automatic failover |
LCR |
Data only |
The Exchange server |
Weekly full backups with daily incremental backups; backup on the passive side by using VSS |
Not a clustered solution; requires manual recovery |
*The belief that clustered systems running with NAS/SAN SGs are unstoppable has proven itself incorrect.
Your NAS/SAN storage solution can fail, and when it does you are left with restore from backups.