TL;DR
Is there a way to run trim / discard on an OSD?
Long story:
I have a Proxmox-Ceph cluster with some OSD as storage for VMs. Discard
works perfectly in this cluster. For lab and testing purposes I deploy
Proxmox-Ceph clusters as Proxmox VMs in this cluster using nested
virtualizacion, each with a few disks acting as OSD. Then a few VMs are
configured in the nested Proxmox cluster using the nested Ceph as
storage. Hope I've explained myself.
The problem I'm facing is that the nested Ceph OSD's are not sending the
trim/discard command to the upstream Ceph OSDs, so thin provisioning is
not kept. Somehow the discard chain is broken at some point.
I've tried using this on the nested ceph OSD:
ceph config set global bdev_enable_discard true
ceph config set global bdev_async_discard true
That somewhat helps, but it does not discard all the used space when
data is deleted from the VM or the VM is fully removed, it maybe
recovers like 20%. This is why I wonder if there is a way to run trim /
discard in an OSD.
Thanks in advance
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