ProxMox - Clearing disks for use

[macrules34]

I have a cluster of 4 servers, 3 out of the 4 have the disk usage type as "Device Mapper", thus not allowing me to create any type of usable disk in proxmox.

What happened was that I had the cluster set-up and then I installed Ceph, and started adding the disks as OSD devices. Something went wrong and I went to remove the disks from the OSD status and that messed things up. So then I decided to re-install proxmox from scratch. Know the disks show up as Device Mapper and when I run lsblk --ascii I get the following:


How do I clear /dev/sda and /dev/sdb so I can use them again?

 

[vl1969]

Not 100% sure but pull them and use gparted on other machine to create new gpt table . Should clear everything from the disk.

 

[Wolvez]

Proxmox comes with gdisk installed. Just do:

gdisk /dev/sda
'x' for extra commands
'z' for zap

That will clear the GPT partition table.
Just double/triple check which disk you are zapping or you will have another problem.

 

[vl1969]

Proxmox comes with gdisk installed. Just do:

gdisk /dev/sda
'x' for extra commands
'z' for zap

That will clear the GPT partition table.
Just double/triple check which disk you are zapping or you will have another problem.

And that is why a said take it to another PC .

 

[macrules34]

I tried the gdisk function but even after I "Zap" it its still shows as Device Mapper. Any ideas?

 

[Wolvez]

You could try some of these options:

zap — Ceph Documentation

docs.ceph.com

I just started experimenting with Ceph this week. I'm not very familiar with it.

 

[PigLover]

sgdisk --zap-all <device>

 

[macrules34]

Thanks @ PigLover

That seemed to do the trick, I just had to reboot the server for it to show up in Proxmox.

 

[PigLover]

There is a way to re-trigger on your devices and get it to show up without reboot. But I can never recall what it is and, being lazy and overconfident in the redundancy I have set up, I just reboot too.

 

[Goose]

parted's disk scan seems to prompt the kernel to refresh the partition table cache

EDIT - Specifically partprobe

hdparm also works

Try googling reread partition table linux if you have issues again in the future