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Building an Extended Distance Cluster Using Serviceguard and Software RAID
Two Data Center and Quorum Service Location Architectures
Chapter 254
• Fibre Channel Direct Fabric Attach (DFA) is recommended over
Fibre Channel Arbitrated loop configurations, due to the superior
performance of DFA, especially as the distance increases. Therefore
Fibre Channel switches are recommended over Fibre Channel hubs.
• Any combination of the following Fibre Channel capable disk arrays
may be used: HP StorageWorks 1000 and 1500 series Modular
Storage Arrays, HP StorageWorks Enterprise Virtual Arrays, or HP
StorageWorks Disk Array XP.
• For disaster tolerance, application data must be mirrored between
the primary data centers. You must ensure that the mirror copies
reside in different data centers, as the software cannot determine the
locations.
NOTE When a failure results in the mirror copies losing synchronization,
MD will perform a full resynchronization when both halves of the
mirror are available.
• No routing is allowed for the networks between data centers. Routing
is allowed to the third data center if a Quorum Server is used in that
data center.
The following is a list of recommended arbitration methods for Extended
Distance Cluster solutions in order of preference:
• Quorum Server running in a Serviceguard cluster
• Quorum Server
For more information on Quorum Server, see the Serviceguard Quorum
Server Release Notes for Linux.
Figure 2-1 is an example of a two data center and third location
configuration using DWDM, with a quorum server node on the third site.