Dne 10.4.2018 v 16:00 Richard W.M. Jones napsal(a):
On Tue, Apr 10, 2018 at 09:47:30AM +0100, Richard W.M. Jones wrote:
Recently in Fedora something changed that stops us from creating small
LVs for testing.
An example failure with a 64 MB partitioned disk:
# parted -s -- /dev/sda mklabel msdos mkpart primary 128s -128s
Warning: The resulting partition is not properly aligned for best performance: 128s % 65535s != 0s
# lvm pvcreate --force /dev/sda1
/dev/sda1: Data alignment must not exceed device size.
Format-specific initialisation of physical volume /dev/sda1 failed.
Failed to setup physical volume "/dev/sda1".
Interestingly the alignment properties of the virtio-scsi virtual disk
has changed. On the working system:
==> /sys/block/sda/queue/minimum_io_size <==
512
==> /sys/block/sda/queue/optimal_io_size <==
0
On the new / broken system:
==> /sys/block/sda/queue/minimum_io_size <==
33553920
What is actually this /dev/sda as device ?
scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-0-0
Is this some qemu emulated storage ?
This reported value (33553920) doesn't really make sense - and testing over
loop device doesn't seem to give same result either.
Regards
Zdenek
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