How to Remove an SSD Disk from MooseFS (MFS) Configuration

This guide explains how to safely remove an SSD that was mistakenly added as a data disk in MooseFS by unmounting the MFS directory, editing the mfshdd configuration, restarting the chunkserver, cleaning up fstab entries, and verifying the removal.

Step 1: Unmount the MFS mount point

# umount /mnt/mfs/

Step 2: Edit the mfshdd configuration file

# vim /etc/mfs/mfshdd.cfg

Comment out or remove the entry that references the SSD to be removed.

Step 3: Restart the MFS chunkserver service

# mfschunkserver restart

Step 4: Remove the automatic mount entry from /etc/fstab

# vim /etc/fstab

Delete or comment out the line that mounts the SSD.

Step 5: Verify the removal

# mfsmount -H mfsmaster /mnt/mfs/

After completing these steps, the SSD is removed from the MooseFS configuration; any further removal of the physical disk can be done with a standard umount command.