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The IBM eServer BladeCenter JS20 - IBM Redbooks

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Application subnet<br />

<strong>The</strong> primary reason you install <strong>BladeCenter</strong> <strong>JS20</strong>s is to support applications.<br />

Many applications have requirements to communicate with other systems. You<br />

use one or more application subnets for this purpose.<br />

<strong>The</strong> primary application subnet is implemented using a VLAN provided by the<br />

LAN Switch I/O Modules installed in I/O module bay 1 of each <strong>BladeCenter</strong><br />

chassis. <strong>The</strong> same LAN Switch I/O Module is used to support the SoL subnet<br />

and VLAN.<br />

Where different <strong>BladeCenter</strong> <strong>JS20</strong>s participate in different applications and there<br />

is a requirement to separate application traffic, you may need to define multiple<br />

application subnets and VLANs. Each <strong>BladeCenter</strong> <strong>JS20</strong> is connected to the<br />

appropriate application subnet based on the applications that are installed on the<br />

blade server.<br />

If application communication requirements with other systems are complex, you<br />

can install an additional pair of Gigabit Ethernet interfaces on each <strong>BladeCenter</strong><br />

<strong>JS20</strong>. You do this using the Gigabit Ethernet Expansion Card in conjunction with<br />

compatible I/O modules installed in I/O module bays 3 and 4.<br />

4.1.2 High-performance, low-latency network requirements<br />

Distributed memory parallel applications may require the installation of a<br />

high-performance, low-latency interconnection network between <strong>BladeCenter</strong><br />

<strong>JS20</strong>s. This requirement can be supported through the use of an optional<br />

Myrinet network.<br />

To install a Myrinet network, you must install a Myrinet Expansion Card on each<br />

<strong>BladeCenter</strong> <strong>JS20</strong> that requires connectivity to the high-performance,<br />

low-latency interconnection network. You must also install an Optical Pass-Thru<br />

I/O Module in I/O module bay 4 of each <strong>BladeCenter</strong> chassis that contains blade<br />

servers equipped with Myrinet Expansion Cards.<br />

<strong>The</strong>n connect the Optical Pass-Thru I/O Module to external Myrinet switches to<br />

complete the Myrinet network infrastructure. This is illustrated in Figure 4-2.<br />

58 <strong>The</strong> <strong>IBM</strong> Eserver <strong>BladeCenter</strong> <strong>JS20</strong>

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