Thanks Oliver, useful checks!
-----Original Message-----
To: ceph-users
Subject: Re: [ceph-users] ceph-volume lvm cannot zap???
Hi,
we have also seen such cases, it seems that sometimes (when the
controller / device is broken in special ways), device mapper keeps the
volume locked.
You can check as follows:
1) Check if lvs / pvs / vgs show some undefined device. In that case,
you may have to flush the lvmeta cache:
pvscan --cache
Check again if zapping works after this, if not, continue.
2) Check major and minor number of the device:
$ ls -la /dev/sdi
brw-rw----. 1 root disk 66, 96 13. Jan 18:14 /dev/sdi
=> In this case, it would be 66:96
3) Check if device mapper still has it locked:
$ dmsetup ls --tree
...
ceph--1f6780e6--b120--4876--b674--aa3337847114-osd--block--1325f49b--fea
d--40ba--957e--ec6b2968d456 (253:1)
└─ (66:96)
...
=> In this case, it is still mapped!
4) Attempt to remove it:
$ dmsetup remove
ceph--1f6780e6--b120--4876--b674--aa3337847114-osd--block--1325f49b--fea
d--40ba--957e--ec6b2968d456
=> If this fails, you may have to use --force (if the disk does not
accept any read/write anymore, this might happen).
Please make absolutely sure this is the correct disk before using
force.
5) If after this, lvs / pvs / vgs show some undefined device, you may
have to flush the lvmeta cache:
pvscan --cache
Latest after these steps, zapping should work, at least we never
encountered anything worse (apart from hangs with a broken RAID
controler firmware, where we needed to eject and reinsert the disk and
rescan devices to make the controller lock go away).
Cheers,
Oliver
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