[root@os004osd001 ~]# ceph-disk list
/dev/xvda :
 /dev/xvda1 other, ext4, mounted on /boot
 /dev/xvda2 other, crypto_LUKS
/dev/xvdb other, xfs, mounted on /var/lib/ceph/osd/ceph-0
/dev/xvdd :
 /dev/xvdd1 other, iso9660