Lenovo ThinkSystem SR950 Setup Manual page 227

3. If you have no additional options to install in the upper compute tray or storage tray, install it into the
chassis. See "Install a compute tray" on page 307 or "Install the storage tray (fully removed)" on page
377.
4. Install any hard disk drives that you removed from the upper compute tray or storage tray. Each drive
should be installed in its original location. See "Install a hard disk drive" on page 324.
5. If you have no additional options to install in the upper or lower compute tray or in the storage tray,
install the front cover. See "Install the front cover" on page 227.
Install a hard disk drive backplane (lower tray)
Hard disk drive backplanes in the lower compute tray are accessed from the front of the server. There are
several types of hard disk drive backplane. Steps that are backplane specific are noted in each procedure.
S002
CAUTION:
The power-control button on the device and the power switch on the power supply do not turn off the
electrical current supplied to the device. The device also might have more than one power cord. To
remove all electrical current from the device, ensure that all power cords are disconnected from the
power source.
"
CAUTION:
Make sure that all server power cords are disconnected from their power sources before performing
this procedure.
Note: If you are installing a system board, processor, memory module, as options in the lower compute tray,
perform these tasks first. See "Install the system board" on page 211, "Install a processor-heat-sink module"
on page 213, or "Install a memory module" on page 216.
Before you install the hard disk drive backplane:
1. If the front cover is installed, remove it. See "Remove the front cover" on page 322.
2. Determine the location of the backplanes to be installed. Backplanes are installed in the following order:
• For SAS-only drive backplanes, backplanes should be populated from left to right, when viewed from
the front of the server (backplane for drives 0-3 first; then, 4-7 and 8-11).
• For NVMe/SAS drive backplanes, backplanes should be populated from right to left, when viewed
from the front of the server (backplane for drives 8-11 first; then, 4-7 and 0-3).
• These population orders allow a mix of drive backplane types to be installed in the server.
3. Apply new drive-bay labels based on the backplane locations determined in the previous step. Several
drive bay labels come with each type of the supported drive backplane. Install the labels that match the
label types used for your server.
4. Remove the lower compute tray. See "Remove a compute tray" on page 305.
5. Remove the fan cage. See "Remove a fan cage (lower tray)" on page 316.
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Chapter 3 Server hardware setup
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