This is a similar issue that we ran into, the root cause was that ceph-deploy doesn't set the partition type guid (that is used to auto activate the volume) on an existing partition. Setting this beforehand while pre-creating the partition is a must or you have you put entries in fstab.
What should it be?
root@host1:~# parted /dev/sda
GNU Parted 2.3
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) p
Model: ATA ST2000DM001-9YN1 (scsi)
Disk /dev/sda: 2000GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Number Start End Size File system Name Flags
1 20.5kB 1049kB 1029kB primary bios_grub
2 2097kB 21.0GB 21.0GB ext4 primary
3 21.0GB 21.5GB 536MB linux-swap(v1) primary
4 21.5GB 2000GB 1979GB xfs primary
Matthew
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