1 Front panel
For information about the controls, connectors, and status LEDs on the front panel, see “Front panel” on
page 18.
2 Optical-drive bay 2
The 5.25-inch optical-drive bay 2 is for a secondary optical drive or a tape drive. Some models have a
secondary optical drive or a tape drive installed.
3 Optical-drive bay 1
Depending on the model, your server might come with an optical drive installed in the 5.25-inch optical-drive
bay 1.
4 Drive activity LED
5 Drive status LED
Each hot-swap drive has two LEDs.
Drive LED
Status
Description
4 Drive activity LED (left) Solid green The drive is powered but not active.
Blinking green The drive is active.
5 Drive status LED (right) Solid yellow
The drive has an error.
Blinking yellow (blinking slowly, about one
flash per second)
The drive is being rebuilt.
Blinking yellow (blinking rapidly, about four
flashes per second)
The RAID adapter is locating the drive.
6 Foot stands
For tower-form-factor models, your server comes with four foot stands. To help the server stand steadily,
ensure that you install the foot stands correctly as shown. See “Install the foot stands” on page 104.
7a 7b 7c 7d Drive bays
The drive bays are used to install 3.5-inch or 2.5-inch storage drives. When you install drives, follow the order
of the drive bay numbers. The EMI integrity and cooling of the server are protected by having all drive bays
occupied. The vacant drive bays must be occupied by drive bay fillers or drive fillers. Depending on the
model, your server supports one of the following drive bay configurations:
• Four 3.5-inch-drive bays
• Eight 3.5-inch-drive bays
• Eight 2.5-inch-drive bays
• Sixteen 2.5-inch-drive bays
Note: For the 2.5-inch-drive-bay models that support NVMe drives, you can install up to four NVMe drives in
bays 4–7.
8 Optical-drive status LED
The optical-drive status LED is blinking in green when the optical drive is working or in the POST process.
16
ThinkSystem ST550 Setup Guide
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