Ultra-Dense Server Deployment in Racks

Compaq Ultra-Dense Server Deployment in Compaq Racks 59
128H-0400A-WWEN
Front of
Rack
4.3.2. Installing Multiple PDUs in a Rack
The following sections describe where to mount the necessary number of PDUs in a rack.
In all the installations, route the input power cord for each PDU either towards the top or the bottom of the
rack, depending on the power source outlets location.
Make sure that the rack grounding wires for all the PDUs are properly connected by following the
instructions came with the PDUs. Grounding accessories are described in Section 1.2 (Glossary).
Section 3 shows several rack configurations including the PDU locations. Note that these PDU locations
will vary depending on whether the sliding-rails or the fixed-rails are used.
4.3.2.1. Mounting 2 PDUs on One-Side
This installation applies to 36U and 42U Compaq 9000- and 7000-series racks. When mounting one or
two PDUs, mount the PDUs on the side where the cables exit the cable trays. This will allow the power
cords to be routed easily to the cable trays. If fixed-rails are used for the servers, then mount the PDUs on
the left side, viewing from the front. If sliding-rails are used, then mount the PDUs on the right side,
viewing from the front.
4.3.2.2. Mounting 1 PDU on Each Side
This procedure is primarily for 22U racks. It is not recommended to mount the PDU in these positions for
36U or 42U racks.
4.3.2.3. Mounting 3 PDUs
This installation applies to 36U and 42U Compaq 9000- and 7000-series racks. When mounting three
PDUs, mount two PDUs on the side where the cable trays are closest to the rear frame of the rack, and
mount the third PDU in the upper half of the other side. This will allow the power cords to be routed
relatively easily. If fixed-rails are used, then mount the two PDUs on the left side, viewing from the front.
If sliding-rails are used, then mount the two PDUs on the right side, viewing from the front, as shown in
Figure 4-2.
Figure 4-2. Three PDUs installed in a 42U rack.