• Unmount the disk:

umount /dev/sdb 

• Remove the disk and replace it with a new one (verify that the OS recognized the disk)

dmesg | tail 

• Format the disk

mkfs.xfs /dev/sdb 

• Mount the disk

mount -a 

• Ensure that the folder where the drive is mounted is owned by the account used by the swift demons

chown -R swift:swift /srv/node/sdb 

That's it! Swift notices that the new disk is empty and begins the replication process. Check the logs to make sure everything is ok.

tail /var/log/syslog -n 50