Switch Modules
The BladeCenter supports a total of four switch modules, but two can only be used with Ethernet switches or Ethernet pass-though.
To be able to use the other switch module bays, a daughtercard needs to be installed on each blade that needs it, to provide the required SAN, Ethernet, InfiniBand or Myrinet function. Mixing of different type daughtercards in the same BladeCenter chassis is not supported.
Read more about this topic: IBM Blade Center
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