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12 Introduction

Server Modules

Depending on the PowerEdge blade server module you choose for your

cluster, the number of available expansion ports and dual inline memory

modules (DIMMs) varies. Table 1-1 provides details about the supported

PowerEdge server modules and PowerEdge server enclosures.

In a Dell PowerEdge high availability cluster configuration, each server

module requires at least one expansion card. Expansion cards for either Fibre

Channel or Ethernet (for iSCSI) are available, and allow the server module to

communicate with the shared storage system for the cluster. The expansion

cards, also known as daughter cards or mezzanine cards, are installed on the

server module and contain two I/O ports. These I/O ports are internally

connected to two separate I/O modules in the server enclosure. By attaching

to two separate I/O modules, an expansion card can provide redundant paths

and load balance the I/O from the server module to the shared storage

system(s) for the PowerEdge cluster solution. Table 1-1 outlines the number

of expansion cards that are available on each supported server module.

Each server module is also configured with two additional Ethernet ports for

cluster interconnects. These are internally connected to two separate

Ethernet pass-through or Ethernet switch modules in the server enclosure.

With certain server modules, it is also possible to configure additional

Ethernet ports, which can enable the use of NIC teaming on the cluster

public network.

Table 1-1. PowerEdge Blade Server Features

Server Enclosure 1855/1955 M1000e

Supported blade server

modules

PowerEdge 1855, 1955 See the Support Matrix at

dell.com/ha for

information on supported

blade server types.

Maximum number of server

modules per server enclosure

10 16

Number of mezzanine card

slots per server module

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