Novell BUSINESS CONTINUITY CLUSTERING FOR NETWARE 1.1 - ADMINISTRATION, Руководство пользователя, Страница: 14 / 98

14 Novell Business Continuity Clustering 1.1 for NetWare Administration Guide
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Implementation Comparison
Table 1-1
Disaster Recovery Implementation Comparison
Stretch Cluster Cluster of Clusters
Advantages
Š
It automatically fails over.
Š
It is easier to manage than
separate clusters.
Š
The chance of LUNs at both
locations becoming primary is
minimized.
Š
eDirectory partitions don't need
to span the cluster.
Š
Each cluster can be in a
separate eDirectory tree.
Š
IP addresses for each cluster
can be on different IP subnets.
Š
It accommodates more than two
sites and cluster resources can
fail over to separate clusters
(multiple-site fan-out failover
support).
Š
SBD partitions are not mirrored
between sites.
Disadvantages
Š
Failure of site interconnect can
result in LUNs becoming primary
at both locations (split brain
problem) if host-based mirroring
is used.
Š
An SBD partition must be
mirrored between sites.
Š
It accommodates only two sites.
Š
All IP addresses must reside in
the same subnet.
Š
The eDirectory partition must
span the cluster.
Š
Resource configurations must be
kept in sync manually.