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BCC 1.1 SP2: Administration Guide for NetWare 6.5 SP8
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Stretch Clusters
A stretch cluster consists of a single cluster where the nodes are located in two geographically
separate data centers. All nodes in the cluster must be in the same Novell eDirectory
TM
tree, which
requires the eDirectory replica ring to span data centers. The IP addresses for nodes and cluster
resources in the cluster must share a common IP subnet.
At least one storage system must reside in each data center. The data is replicated between locations
by using host-based mirroring or storage-based mirroring. For information about using mirroring
solutions for data replication, see
Section 1.2.2, “Host-Based versus Storage-Based Data Mirroring,”
on page 14
. Link latency can occur between nodes at different sites, so the heartbeat tolerance
between nodes of the cluster must be increased to allow for the delay.
The split-brain detector (SBD) is mirrored between the sites. Failure of the site interconnect can
result in LUNs becoming primary at both locations (split brain problem) if host-based mirroring is
used.
In the stretch-cluster architecture shown in
Figure 1-1
, the data is mirrored between two data centers
that are geographically separated. The server nodes in both data centers are part of one cluster, so
that if a disaster occurs in one data center, the nodes in the other data center automatically take over.
Figure 1-1
Stretch Cluster
Cluster of Clusters
A cluster of clusters consists of multiple clusters in which each cluster is located in a geographically
separate data center. Each cluster can be in different Organizational Unit (OU) containers in the
same eDirectory tree, or in different eDirectory trees. Each cluster can be in a different IP subnet.
Server 6 Server 7
Server 5
Server 8
Fibre Channel
Switch
Server 2 Server 3
Server 1
Server 4
Fibre Channel
Switch
Fibre Channel
Disk Array
Disk blocks
WAN
Cluster
Heartbeat
SAN
Ethernet Switch
Ethernet Switch
Fibre Channel
Disk Array
Building A
Building B
8-node cluster stretched
between two sites
Site 2
Site 1
Содержание BUSINESS CONTINUITY CLUSTERING 1.1 SP2 - ADMINISTRATION
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