Yes, use everywhere virtio-scsi (via kvm with discard='unmap'). 'lsblk
--discard' also shows discard is supported. vm's with xfs filesystem
seem to behave better.
-----Original Message-----
Cc: lordcirth; ceph-users
Subject: Re: [ceph-users] Re: guest fstrim not showing free space
What driver did you use to mount the volumes? I believe only virtio-scsi
supports fstrim commands.