Hello Ceph Users, Has anyone found a way to improve the speed of the rbd du command on large rbd images? I have object map and fast diff enabled - no invalid flags on the image or it's snapshots.
We recently upgraded our Ubuntu 16.04 KVM servers for Cloudstack to Ubuntu 18.04. The upgrades libvirt to version 4. When libvirt 4 adds an rbd pool it discovers all images in the pool and tries to get their disk usage. We are seeing a 50TB image take 25min. The pool has over 300TB of images in it and takes hours for libvirt to start. We can replicate the issue without libvirt by just running a rbd du on the large images. The limiting factor is the cpu on the rbd du command, it uses 100% of a single core. Our cluster is completely bluestore/mimic 13.2.4. 168 OSDs, 12 Ubuntu 16.04 hosts. Kind regards, Glen Baars This e-mail is intended solely for the benefit of the addressee(s) and any other named recipient. It is confidential and may contain legally privileged or confidential information. If you are not the recipient, any use, distribution, disclosure or copying of this e-mail is prohibited. The confidentiality and legal privilege attached to this communication is not waived or lost by reason of the mistaken transmission or delivery to you. If you have received this e-mail in error, please notify us immediately. _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
