Compaq ProLiant 6500 Compaq Parallel Database Cluster Model PDC/O2000 for Orac - Page 51
Active/Active Configuration Examples for Redundant Fibre Channel Fabrics
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Cluster Architecture 2-27 Active/Active Configuration Examples for Redundant Fibre Channel Fabrics This section describes examples of active/active configurations when two, three, four, and five RA4000/RA4100 Arrays are present in one redundant Fibre Channel Fabric of a four-node PDC/O2000 cluster. These examples represent one method for configuring active/active configurations. They are presented here to provide a relatively simple and consistent method for building active/active configurations for redundant Fibre Channel Fabrics. IMPORTANT: Figures 2-11 through 2-14 show active/active configurations for a four-node cluster. Active/active configurations for clusters with two, three, five, or more nodes are not described here. However, the illustrated active/active configuration examples provided should supply sufficient information for building an active/standby configuration in any PDC/O2000 cluster. The active/active configuration examples shown in Figures 2-11 through 2-14 follow these configuration guidelines: I For every Fibre Host Adapter pair, the top or leftmost Fibre Host Adapter in each node is connected to the odd-numbered Fibre Channel SAN Switch (Fibre Channel SAN Switch #1). This is an active Fibre Host Adapter. I For every Fibre Host Adapter pair, the bottom or rightmost Fibre Host Adapter in each node is connected to the even-numbered Fibre Channel SAN Switch (Fibre Channel SAN Switch #2). This is also an active Fibre Host Adapter. I In each RA4000/RA4100 Array, the top (rack model) or right rear (tower model) array controller is always the active controller. I In each RA4000/RA4100 Array, the bottom (rack model) or left rear (tower model) array controller is always the standby controller. I The odd-numbered Fibre Channel SAN Switch (Fibre Channel SAN Switch #1) is connected to the active array controller in each odd-numbered RA4000/RA4100 Array (1, 3, and 5). I The odd-numbered Fibre Channel SAN Switch (Fibre Channel SAN Switch #2) is connected to the standby array controller in each even-numbered RA4000/RA4100 Array (2 and 4).