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

==> /sys/block/sda/queue/optimal_io_size <==
0

(all other settings were the same).  I suppose this accounts for it,
and it could therefore be a problem with qemu rather than LVM.

Working: qemu-2.11.0-4.fc28.x86_64
Broken:  qemu-2.12.0-0.5.rc1.fc29.x86_64

Alasdair Kergon asked me to run the lvm command with -vvvv and I've
attached those results.


Hi

Could you please retest first with official final release of 4.16 kernel.

There were some 'min()/max()' macro problems - maybe your rc4 build was 
affected.


Regards


Zdenek

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