Re: Can not mount rbd device anymore

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On Tue, Jun 22, 2021 at 02:36:00PM +0200, Ml Ml wrote:
> Hello List,
> 
> oversudden i can not mount a specific rbd device anymore:
> 
> root@proxmox-backup:~# rbd map backup-proxmox/cluster5 -k
> /etc/ceph/ceph.client.admin.keyring
> /dev/rbd0
> 
> root@proxmox-backup:~# mount /dev/rbd0 /mnt/backup-cluster5/
>  (just never times out)


Hi,

there used to be some kernel lock issues when the kernel rbd client
tried to access an OSD on the same machine. Not sure if these issues
still exist (but I would guess so) and if you use your proxmox cluster
in a hyperconverged manner (nodes providing VMs and storage service at
the same time) you may just have been lucky that it had worked before.

Instead of the kernel client mount you can try to export the volume as
an NBD device (https://docs.ceph.com/en/latest/man/8/rbd-nbd/) and
mounting that. rbd-nbd runs in userspace and should not have that
locking problem.

Matthias
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