Can you provide the output from "rbd info <pool name>/volume-80838a69-e544-47eb-b981-a4786be89736"? On Tue, Mar 13, 2018 at 12:30 PM, Fulvio Galeazzi <fulvio.galeazzi@xxxxxxx> wrote: > Hallo! > >> Discards appear like they are being sent to the device. How big of a >> temporary file did you create and then delete? Did you sync the file >> to disk before deleting it? What version of qemu-kvm are you running? > > > I made several test with commands like (issuing sync after each operation): > > dd if=/dev/zero of=/tmp/fileTest bs=1M count=200 oflag=direct > > What I see is that if I repeat the command with count<=200 the size does not > increase. > > Let's try now with count>200: > > NAME PROVISIONED USED > volume-80838a69-e544-47eb-b981-a4786be89736 15360M 2284M > > dd if=/dev/zero of=/tmp/fileTest bs=1M count=750 oflag=direct > dd if=/dev/zero of=/tmp/fileTest2 bs=1M count=750 oflag=direct > sync > > NAME PROVISIONED USED > volume-80838a69-e544-47eb-b981-a4786be89736 15360M 2528M > > rm /tmp/fileTest* > sync > sudo fstrim -v / > /: 14.1 GiB (15145271296 bytes) trimmed > > NAME PROVISIONED USED > volume-80838a69-e544-47eb-b981-a4786be89736 15360M 2528M > > > > As for qemu-kvm, the guest OS is CentOS7, with: > > [centos@testcentos-deco3 tmp]$ rpm -qa | grep qemu > qemu-guest-agent-2.8.0-2.el7.x86_64 > > while the host is Ubuntu 16 with: > > root@pa1-r2-s10:/home/ubuntu# dpkg -l | grep qemu > ii qemu-block-extra:amd64 1:2.8+dfsg-3ubuntu2.9~cloud1 > amd64 extra block backend modules for qemu-system and qemu-utils > ii qemu-kvm 1:2.8+dfsg-3ubuntu2.9~cloud1 > amd64 QEMU Full virtualization > ii qemu-system-common 1:2.8+dfsg-3ubuntu2.9~cloud1 > amd64 QEMU full system emulation binaries (common files) > ii qemu-system-x86 1:2.8+dfsg-3ubuntu2.9~cloud1 > amd64 QEMU full system emulation binaries (x86) > ii qemu-utils 1:2.8+dfsg-3ubuntu2.9~cloud1 > amd64 QEMU utilities > > > Thanks! > > Fulvio > -- Jason _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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