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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