On Wed, Jun 23, 2021 at 9:59 AM Matthias Ferdinand <mf+ml.ceph@xxxxxxxxx> wrote: > > 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. rbd-nbd is also susceptible to locking up in such setups, likely more so than krbd. Don't forget that it also has a kernel component and there are actually more opportunities for things to go sideways/lock up because there is an extra daemon involved allocating some additional memory for each I/O request. Thanks, Ilya _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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