** Description changed: On the host machine, a disk is configured with 4k sector sizes: --- sudo fdisk /dev/sdd Disk /dev/sdd: 4000.6 GB, 4000627818496 bytes 255 heads, 63 sectors/track, 60797 cylinders Units = cylinders of 16065 * 4096 = 65802240 bytes Sector size (logical/physical): 4096 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0xf8eabb69 --- ... and when fdisking the lvm parition, also reports properly: --- Disk /dev/VMsVG/mail: 21.0 GB, 20971520000 bytes 255 heads, 63 sectors/track, 318 cylinders Units = cylinders of 16065 * 4096 = 65802240 bytes Sector size (logical/physical): 4096 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x6a3bdb21 --- - However, within a VM using the LVM parition as a raw disk, its fdisk reports a 512 block size: + However, within a guest VM using the LVM parition as a raw disk, its fdisk reports a 512 block size: --- Disk /dev/vda: 21.0 GB, 20971520000 bytes 16 heads, 63 sectors/track, 5079 cylinders Units = cylinders of 1008 * 4096 = 4128768 bytes Sector size (logical/physical): 4096 bytes / 4096 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x915c306a using cache=none, which is established practice for best performance on - raw devices, the host system repeatedly fails to write to the disk, due + raw devices, the guest system repeatedly fails to write to the disk, due to it trying to write 512 byte sectors while the backing is 4096. + + Both systems are using Ubuntu 11.04 server.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/802081 Title: qemu raw/nocache fails to operate on LVM partition with 4k sector size To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/802081/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
