Hello, I did not get response to my private mail address. So I'm subscribed now. Bye Markus -------- Original-Nachricht -------- Betreff: Discard is not working Datum: Wed, 05 Feb 2014 23:53:56 +0100 Von: chickenmarkus@xxxxxxxxxx An: kvm@xxxxxxxxxxxxxxx Hello, after reading the "invitation" for some one-off questions without subscribing excuse my disturbing, please. At first my setup of host: * in general Debian Wheezy * Kernel: 3.11-0.bpo.2-amd64 (http://packages.debian.org/wheezy-backports/linux-image-3.11-0.bpo.2-amd64) * LVM 2.02.98 (http://packages.debian.org/jessie/lvm2) * thin-provisioning-tools 0.2.8-1 (http://packages.debian.org/jessie/thin-provisioning-tools) * Qemu-KVM: 1.7.0 (http://packages.debian.org/jessie/qemu-kvm) The new kernel and dirty things from Jessie are for working thin volumes with discard on my ssd. Everything's fine up to this point. Afterwards I start a guest (also Debian Wheezy) over the following command (over libvirt) as root (for test only): kvm [...] -drive file=/dev/ssd0/sarabi,if=none,id=drive-scsi0-0-0-0,format=raw,discard=unmap -device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=2 [...] Neither lsblk -D nor the try of fstrim ends positive. Both say that discard is not supported. I read that guests need at least kernel 3.4 to support discard (and virtio-scsi). But the same backports kernel 3.11 did not changed anything. Did I understand something wrong? Is the command wrong? Are any requirements not met? Bye Markus -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
