Hi, my first question is, what kind of ceph client version is used by libvirt? Regards, Joachim www.clyso.com Hohenzollernstr. 27, 80801 Munich Utting a. A. | HR: Augsburg | HRB: 25866 | USt. ID-Nr.: DE2754306 Eugen Block via ceph-users <ceph-users@ceph.io> schrieb am Mi., 11. Feb. 2026, 12:24:

Hi,

your question is a bit "thin", I'd say. A lot has changed in Tentacle [0], but nothing of the mentioned changes looks critical wrt libvirt from my perspective. Do you have any logs or more detailed descriptions what exactly fails? We haven't upgraded to v20 yet, at least not our prod cluster, we also use RBD heavily (OpenStack on Ubuntu), so this is quite relevant for us.

Thanks, Eugen

[0] https://ceph.io/en/news/blog/2025/v20-2-0-tentacle-released/#rbd

Am Di., 10. Feb. 2026 um 00:06 Uhr schrieb Piotr Pisz via ceph-users < ceph-users@ceph.io>:

...

Hello,

We upgraded Ceph to Tentacle, and everything went fine, but all hosts running Ubuntu 22 and 24 lost connectivity to RBD at the libvirt level.

What has changed in the tentacle?

Best regards,

Piotr

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