I am installing ceph in my lab box using ceph-ansible, i have two HDD
for OSD and i am getting following error on one of OSD not sure what
is the issue.



[root@ceph-osd-01 ~]# ceph-disk prepare --cluster ceph --bluestore /dev/sdb
ceph-disk: Error: Device /dev/sdb1 is in use by a device-mapper
mapping (dm-crypt?): dm-0


[root@ceph-osd-01 ~]# ceph-disk list
/dev/dm-0 other, xfs, mounted on /
/dev/sda :
 /dev/sda1 other, xfs, mounted on /boot
 /dev/sda2 swap, swap
/dev/sdb :
 /dev/sdb1 other, LVM2_member
/dev/sdc :
 /dev/sdc1 ceph data, active, cluster ceph, osd.3, block /dev/sdc2
 /dev/sdc2 ceph block, for /dev/sdc1
/dev/sr0 other, unknown
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