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Additional Considerations
Compaq recommends connecting each FC HBA of the dual FC HBA servers to a different switch, if
possible. Cabling in this manner ensures that a loss of an FC switch does not result in a dual FC HBA
server losing access to its storage.
Compatibility with Other Operating Systems
Servers running other operating systems, such as Compaq Tru64 UNIX, Compaq OpenVMS, or Sun
Solaris, require the presence of at least two FC HBAs. Within this document, they are considered to be
dual FC HBA servers. They can be connected to the same SAN and controllers as used by the single
FC HBA servers. However, the configuration remarks and requirements detailed in the section titled
"Dual FC HBA Servers Running Microsoft Windows NT 4.0 / 2000" also apply to servers from other
operating systems. Refer to the SANworks Data Replication Manager by Compaq HSG80 ACS Version
8.6-4P Configuration Guide for information on configuring servers running other operating systems.
Intersite Links
The single FC HBA server configuration has no effect on the type of ISL used. Therefore, as of the
writing of this document, the following types of intersite links are supported:
•
Multimode fiber (up to 500 m; up to 300 m at 2 Gb/s)
•
Single mode fiber (up to 10 km or 100 km with very long distance GBICs)
•
Wave division multiplexing (WDM)
•
Asynchronous transmission mode (ATM)
•
Fibre Channel over Internet Protocol (FC-IP)
Contact your local Compaq representative for more information on certified vendors of WDM, ATM,
and FC-IP equipment, or refer to the SANworks Data Replication Manager by Compaq Application
Notes - HSG80 ACS Version 8.6-4P Design Guide.
There is a relationship between the single/dual FC HBA servers and the number of HSG80 controllers
that can be put on an ISL. During a full site resynchronization, each controller in an HSG80 controller
pair can transmit up to 32.5 MB/s to the other site. For one HSG80 controller pair, this means 65 MB/s
Because single FC HBA server configurations typically have one or two intersite links, and both
controllers share the same ISL, it can be expected that in larger configurations the bandwidth available
on the ISL will become a bottleneck. Furthermore, dual FC HBA servers have the tendency to
statically load balance their units over both controllers in an HSG80 controller pair. Typically, this
means that a dual FC HBA server can deliver twice the amount of I/O as a single FC HBA server. As
always in DRM configurations, and in single FC HBA servers in particular, it is important to have an
understanding of the I/O profile of the applications when sizing the total solution.
Automated Failover/Failback scripts
The failover/failback scripts detailed in the SANworks Data Replication Manager by Compaq HSG80
ACS Version 8.6-1P Scripting User Guide operate normally in a single FC HBA server configuration.
If you are using the SANworks Management Appliance, as of the writing of this document, it will
interfere with the running of the standard scripting tools. To prevent this interference, you must remove
the SANworks Management Appliance from the SAN so that it cannot see the controllers. It can be
removed either by a temporary zone setup, by unplugging it from the SAN, or by powering it down.
16
Application Notes – Data Replication Manager Windows-Based Server with Single Host Bus Adapter
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