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Remove device mappers from disk

If you need to get rid of device mapper entries, e.g. because the disc-device you are using was formerly an ceph-OSD.

sudo fdisk -l

...
Disk /dev/mapper/ceph--3bfa653f--0d9d--4d70--8b06--c09efde3b1f8-osd--block--5ba5209f--4c50--495c--a061--d6456321a84b: 233.3 GiB, 250446086144 bytes, 489152512 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
...

To get rid of this you can use dmsetup. If you don#t have it installed yet: ' sudo apt-get install dmsetup ' is your friend.

dmsetup info # check mapping

> Name:              ceph--7ae25770--3171--466d--ab5c--7c1baa6bf8eb-osd--block--eaf63452--31c6--42af--b8cd--4a8265c1739b
> State:             ACTIVE
> Read Ahead:        256
> Tables present:    LIVE
> Open count:        0
> Event number:      0
> Major, minor:      252, 1
> Number of targets: 1
> UUID: LVM-DbOk82x1IjzzDnudve307QUBys9bLSUj8a5Yrcfv00Z3LjDTi1JLGxECSTd021Wa

dmsetup remove ceph--7ae25770--3171--466d--ab5c--7c1baa6bf8eb-osd--block--eaf63452--31c6--42af--b8cd--4a8265c1739b# remove it

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