From mboxrd@z Thu Jan  1 00:00:00 1970
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From: Zdenek Kabelac <zkabelac@redhat.com>
Message-ID: <54d81d24-576e-17d4-8092-aa3d99eb69ff@redhat.com>
Date: Tue, 10 Apr 2018 17:01:03 +0200
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Subject: Re: [linux-lvm] "Data alignment must not exceed device size."
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To: linux-lvm@redhat.com, "Richard W.M. Jones" <rjones@redhat.com>

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