Datasheet

Diagram #2
The SAN16B-2 Express Model can be
upgraded to 16 ports and is future-
ready to support 4 Gbps servers and
storage devices as they are introduced.
Its flexible design allows participation
with other SAN b-type switches in fab-
rics that evolve as requirements
change. And it supports advanced
functions to help enable participation in
complex fabrics including cascaded
switches and ISL trunks.
High availability SAN configuration
Many applications require continuous
operation. A common design approach
to achieve that objective is to run multi-
ple instances of the application across
a cluster of servers. When a server fails
or must be taken offline for mainte-
nance a backup server is available to
help continue operation with a minimum
of impact. Redundant paths to data are
usually configured in a clustered server
environment for the same reasons in an
effort to help maintain access to data.
Each server is configured with redun-
dant Host Bus Adapters. And each
Host Bus Adapter is connected to a dif-
ferent SAN switch, and each switch is
connected to both controllers in a disk
system. Every effort is made to help
maintain application access to data.
The SAN16B-2 Express Model is an
excellent switch to use in a clustered
server environment. Separate SAN
switches enable two separate SAN fab-
rics, which are desirable as a means to
help minimize or eliminate single points
of failure. The yellow and green clusters
shown in Diagram #2 above provide
redundant components at every level
and are designed to help minimize
application outages.
Business continuity solution
Many small and medium-size compa-
nies want to implement a business con-
tinuity or remote backup capability to
help address strict new regulatory
requirements. The SAN16B-2 Express
Model fabric switch is designed to pro-
vide SAN connectivity for these environ-
ments. Diagram #3 on the following
page is intended to represent two dif-
ferent sites. The blue side represents
the production site and the green side
represents the remote or backup site.
Many disk subsystems, including
IBM TotalStorage DS6000 and DS4000
systems, are capable of copying data
to a remote location. The data path for
the remote copy operation is repre-
sented by the red links in the diagram.
Two SAN16B-2 Express Model fabric
switches can be connected over metro