Replacing a faulty hard drive

A Trellix DLP 8800 appliance is equipped with two Solid State Disks (SSDs). When a disk becomes faulty, you can replace it using the mdraid tool. The disks are partitioned and configured for RAID-1 using the Linux software RAID.

Caution
Use only the replacement hard drives provided by Trellix. Do not reseat hard drives unless directed to by Technical Support.

Log on to the appliance where you want to replace a disk from a local system console or remotely using SSH.
When connecting with SSH, consider using a terminal multiplexer to ensure that the replacement procedure does not fail due to an unstable or broken SSH connection.
Locate the disk that you want to remove.
The two disks on the appliance are named sda and sdb. Run this command to find out which disk is located where:
scm: mdraid-tool locate sd<x>, where <x> is either a or b.
The LED on disk sda or sdb starts blinking.
Run this command to remove the disk from the RAID configuration before removing it physically. In the command, specify sda or sdb depending on which disk you want to remove.
scm: mdraid-tool remove sd<x>
This removes the disk from all RAID volumes where it was a member. The LED on the disk turns to continuous red, as the disk status must be faulty before a disk can be physically removed.
Remove the old disk from the slot on the appliance hardware platform and insert the new disk.
Run this command to add the new disk to the RAID configuration scm: mdraid-tool add sd<x>.
The new disk is added to the RAID configuration. The content of the disk that was removed is mirrored on to the new disk. While this process is going on, the red LED blinks slowly.