HP Cluster Platform Server and Workstation Overview

4.5 Server Blade Type vs Gigabit Ethernet Blade Switch with Bandwidth
Ratios
The following table provides the server blade type to gigabit Ethernet blade switch bandwidth
(BW) ratios. For more information on the gigabit Ethernet switch modules listed in the table
below, see the HP Cluster Platform Gigabit Ethernet Hardware Guide.
Two 4-Port HP
GbE2c Switch
Modules per HP
BladeSystem
c-7000
Enclosure
(410917-B21)
One 4-Port HP
GbE2c Switch
Module per HP
BladeSystem
c-7000
Enclosure
(410917-B21)
Two 8-Port
Cisco Switch
Modules per
HP
BladeSystem
c-7000
Enclosure
(410916–B21)
One 8-Port
Cisco Switch
Module per HP
BladeSystem
c-7000
Enclosure
(410916–B21)
Two 16-Port
Pass-Through
Modules Per
HP
BladeSystem
c-7000
Enclosure
(406740-B21)
One 16-Port
Pass-Through
Module Per HP
BladeSystem
c-7000
Enclosure
(406740-B21)
Server Blade
Type
N/A2:1 BWN/A1:1 BWN/A1:1 BW
Single density
full-height
N/A4:1 BWN/A2:1 BWN/A1:1 BW
Single density
half-height
4:1 BWN/A2:1 BWN/A1:1 BWN/A
Double
density
half-height
Note:
The part numbers listed in the table above are subject to change without notice.
4.6 HP 4x DDR InfiniBand Switch Module for c-Class BladeSystem
The HP 4x DDR InfiniBand switch module is inserted in a double-wide module bay in the back
of the HP c-Class BladeSystem enclosure. The 4x DDR InFiniBand switch module is based on
the Mellanox 24-port InfiniScale III 4x DDR InfiniBand switch chip. The 4x DDR InfiniBand
switch module provides 24 InfiniBand 4x DDR ports with 20 Gb/s port-to-port connectivity. The
ports are arranged as 16 downlinks to connect up to 16 server blades in the enclosure, and eight
uplinks to connect to external InfiniBand switches to build an InfiniBand fabric. The 4x DDR
InfiniBand switch module is designed to fit into the double-wide switch bays in the c-Class
enclosure. Section 4.6.1 describes the installation procedures for the 4x DDR InfiniBand switch
module.
4.6.1 HP 4x DDR InfiniBand Switch Module Removal and Installation Procedure
Depending on the mezzanine connectors used for the 4x DDR InfiniBand Mezzanine HCA, the
4x DDR IB switch module has to be inserted into switch bays 3 and 4, 5 and 6, or 7 and 8. The
default 4x DDR InfiniBand double-wide switch module (24 ports w/16 DDR links down, and 8
DDR links up) will occupy I/O Bay Row-3 (Bays 5 and 6) of the c-Class (c7000) enclosure for both
half-height (HH) and full-height (FH) server blades. A full-height server blade can support an
additional InfiniBand mezzanine option in mezzanine slot 3, along with a second double-wide
4x DDR InfiniBand switch module installed in I/O bay row-4 which corresponds to bays 7 and
8 in the rear of the c-Class enclosure. In this configuration, a full-height server blade configuration
can be viewed as having a 1:1 I/O ratio.
For the bandwidth ratios for different server blade mezzanine HCA to interconnect module bays
in HP Cluster Platform BladeSystem configurations, see Table 4-4.
172 Server Blades