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Dear all, I try to use ceph block device within my VM, and configure the vm following the steps in
http://ceph.com/docs/dumpling/rbd/libvirt/,
eventually I can see the logical device in the VM. Then I want to enabling the discard/trim for this logical device, and add the parameter discard_granularity just as
http://ceph.com/docs/master/rbd/qemu-rbd/ says. Within the VM, I mount this logical device with the option discard, but after I put and rm the file in it, then ftrim the mount point, the file
is still in ceph cluster, not be deleted. Is there anything I miss?? Thank you. PS: The info of the vm. 6 S 108 10693 1 0 80 0 - 860209 poll_s Mar04 ? 00:03:15 qemu-system-x86_64 -machine accel=kvm:tcg -name ceph -S -M pc-1.0 -m 1024 -smp 2,sockets=2,cores=1,threads=1
-uuid 110c2a64-959b-d1bb-7803-41bb83efd2ff -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/ceph.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2
-device lsi,id=scsi0,bus=pci.0,addr=0x6 -drive file=/var/lib/libvirt/images/precise-server-cloudimg-amd64-disk1.img,if=none,id=drive-ide0-0-0,format=qcow2 -device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -drive file=rbd:libvirt-pool/new-libvirt-image:id=libvirt:key=xxxxxxxxxxxxx==:auth_supported=cephx\;none:mon_host=10.4.3.202\:6789\;10.4.3.203\:6789\;10.4.3.204\:6789,if=none,id=drive-scsi0-0-0,format=raw
-device scsi-hd,bus=scsi0.0,scsi-id=0,drive=drive-scsi0-0-0,id=scsi0-0-0 -netdev tap,fd=24,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=52:54:00:e6:6e:fa,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0
-vnc 127.0.0.1:0 -vga cirrus -device intel-hda,id=sound0,bus=pci.0,addr=0x4 -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5
-set device.scsi0-0-0.discard_granularity=4096 The info of mount within the vm. /dev/sda on /mnt/ceph type xfs (rw,discard) I also try ext4, but fail to enable discard too. The version of relative SW in my platform. Qemu：1.4 Libvirt：1.0.2 Ceph: 0.72.2 Ubuntu：12.04，
kernel: 3.5.0 Thanks & Regards Li JiaMin System Cloud Platform 3#4F108 |
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