Replacing USB Storage Devices

USB storage devices are optional components on J Series Services Routers. If installed, a USB storage device provides secondary storage for the router. It can accommodate software images, configuration files, and microcode. If the internal compact flash fails on startup, and the external compact flash is not installed or fails, the router boots from the USB storage device.

For information about configuring the USB storage device, see the JUNOS Software Interfaces and Routing Configuration Guide.

Note: For a list of supported USB storage devices, see the JUNOS Software Release Notes at http://www.juniper.net.

To remove and install a USB storage device, perform the following procedures:

• Removing the USB Storage Device
• Installing the USB Storage Device

Removing the USB Storage Device

Note: Depending on your configuration, the Services Router might not have a USB storage device. If no USB storage device is installed, proceed directly to Installing the USB Storage Device.

The USB storage device is installed into the USB port on the front panel of the Services Router. To remove the USB storage device:

1. Verify the device that the router used to boot, by running the show system storage command from the CLI. For example:
   
   

   user@host> show system storage

   Filesystem        512-blocks       Used      Avail Capacity Mounted on
   /dev/ad0s1a           218254     175546      40526     81%  /
   ...

   The boot device is mounted on /. The internal compact flash is located at ad0. The external compact flash is located at ad2. The USB storage device is located at da0. This example shows that the router booted from the internal compact flash.

   If the show system storage output indicates that the router booted from the external compact flash, you need to power off the router before replacing the compact flash.

2. Place an electrostatic bag or antistatic mat on a flat, stable surface.
3. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to the ESD point on the chassis, or to an outside ESD point if the router is disconnected from earth ground. For more information about ESD, see Preventing Electrostatic Discharge Damage.
4. Press and release the power button to power off the router. Wait for the POWER LED to turn off before you remove the compact flash.

   Skip this step, if the router did not boot from the external compact flash (see Step Step 1).

5. Gently grasp the USB storage device and slide it out of the USB port.
6. Place the USB storage device on the antistatic mat or in the electrostatic bag.

Installing the USB Storage Device

To install the USB storage device:

Note: For a list of supported USB storage devices, see the JUNOS Software Release Notes at http://www.juniper.net.

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and connect the strap to the ESD point on the chassis, or to an outside ESD point if the router is disconnected from earth ground. For more information about ESD, see Preventing Electrostatic Discharge Damage.
2. Orient the USB storage device with the USB port on the front panel of the router.
3. Insert the USB storage device into the USB port. If the USB storage device does not easily slide into the port, it might not be oriented correctly. Turn the USB storage device upside-down and try again.
4. To configure the USB storage device with the request system snapshot command, see the JUNOS Software Administration Guide.