Clearing Ceph OSD partition

[Fred Saunier]

Hi everyone

I removed and destroyed all of my OSDs, in order to re-add them differently. Some OSDs got destroyed properly and are available to be added back into a new CEPH. Other disks are not available, due to a partition remaining on the drive :

$ sudo lsblk /dev/sdb
NAME                                                                                 MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sdb                                                                                    8:16   0  7,3T  0 disk
└─ceph--8dbbdc67--44af--4410--8982--43bd4d103e3f-osd--block--3d571414--57b7--4b62--9210--3298f7e3ef69
                                                                                     253:6    0  7,3T  0 lvm

The partition is not showing in gdisk, so I was not able to remove it with this tool.
I also tried dd if=/dev/zero of=/dev/sdb bs=512 count=1 -- to no avail.

How can I clear the remaining data on the disk, so I can add the OSD back?

Thanks

 

[ermanishchawla]

Follow this
https://docs.ceph.com/docs/master/ceph-volume/lvm/zap/

 

[Jeff Wadsworth]

Or even better:

gdisk /dev/sd*
* for drive letter /dev/sdf for example
'x' for extra commands
'z' for zap