Dell EqualLogic PS4100E, Руководство по настройке

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March 2013 Dell EqualLogic Configuration Guide v14.1 9-94
9.2 Designing a SAN using blade Pass-through module
This SAN design include configurations where the blade server host ports are directly connected to
TOR switches using 1GbE pass-through IOM in the M1000e blade chassis. The storage ports are also
connected to the TOR switches,
Note that because an ISL stack is not a recommended configuration due to a lack of SAN availability
during stack reloads, only one single switch tier design with ISL stack was tested – Blade IOM switch
only – and the TOR switch only with ISL stack design was excluded.
This SAN design provides sufficient ISL bandwidth between the two switches by creating a LAG
between the external switches. Since there is only a single tier of switches, there is no uplink from the
blade IOM switches. The remaining ports on each switch can accommodate the connection of
multiple PS Series array members. The host/storage port ratio with the maximum number of array
members is 1:1.
The following diagram illustrates how to directly connect the two switches and how the two switches
are connected by an ISL LAG. Also note that the corresponding port on the passive controller is should
be connected to a different switch than the port on the active controller, ensuring that the port-based
failover of the array member will connect to a different switch upon port, cable or switch failure.
Management and host LAN networks are shown for reference.
Pass-Through modules are supported for use with EqualLogic SAN solutions. The Pass-Through
module provides a simple, direct path from each blade server’s optional Ethernet mezzanine card to
an externally accessible port. These ports can then be connected to one or more external switches
that are hosting PS Series arrays.