Chapter 8. MetroCluster 105
MetroCluster technology is an important component of enterprise data protection strategies.
In a failure in one location (the local node or the disks are failing), MetroCluster provides
automatic failover to the remaining node. This failover allows access to the data copy
(because of SyncMirror) in the second location.
A MetroCluster system is made up of the following components:
Two N series storage controllers, HA configuration: These controllers provide the nodes
for serving the data in a failure. N62x0 and N7950T systems are supported in
MetroCluster configurations, whereas N3x00 is not supported.
MetroCluster VI FC HBA: Used for cluster interconnect.
SyncMirror license: Provides an up-to-date copy of data at the remote site. Data is ready
for access after failover without administrator intervention. This license includes Data
ONTAP Essentials.
MetroCluster/Cluster remote and CFO license: Provides a mechanism to fail over
(automatically or administrator driven).
FC switches: Provide storage system connectivity between sites and locations. These
switches are used for fabric MetroClusters only.
FibreBridges if you use EXN3000 or EXXN3500 SAS Shelves.
Cables: Multimode fiber optic cables (single-mode cables are not supported).
MetroCluster allows the Active/Active configuration to be spread across data centers up to
100 km apart. During an outage at one data center, the second data center can assume all
affected storage operations that are lost with the original data center.
SyncMirror is required as part of MetroCluster to ensure that an identical copy of the data
exists in the second data center. If site A goes down, MetroCluster allows you to rapidly
resume operations at a remote site minutes after a disaster. SyncMirror is used in
MetroCluster environments to mirror data in two locations, as shown in Figure 8-2 on
page 106. Aggregate mirroring must be like-to-like disk types.
Remember: Since the Data ONTAP 7.3 release, the cluster license and SyncMirror license
are part of the base software bundle.
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