Hello everyone!

I have next problem.
what done:
1. We deploy 2 physical hosts with SLES 12 SP1 and install XEN hypervizor on both.
2. On each host we provide few block devices via FC.
3. On each host we deploy fullvirt VM with SLES 12 SP1 guest system.
4. Block devices connected to each of VM as scsi or xendisk (virsh dumpxml above)
5. from one of VM, we create LVM on disks (1 VG per 1 PV) fs=ext3
6. after rescan another VM can see new VG

1. on vm1:
mount /dev/vg1/lv1 /srv/lv1
echo 'test from 1st vm' > /srv/lv1/1test.txt
umount /srv/lv1
vgchange -an vg1 && vgexport vg1
2. on vm2:
vgimport vg1 && vgchange -ay vg1
mount /dev/vg1/lv1 /srv/lv1
cat /srv/lv1/1test.txt
>>> test from 1st vm
echo 'answer from 2nd vm' >> /srv/lv1/1test.txt
echo 'test from 2nd vm' > /srv/lv1/2test.txt
umount /srv/lv1
vgchange -an vg1 && vgexport vg1
3. on vm1:
mount /dev/vg1/lv1 /srv/lv1
cat /srv/lv1/1test.txt
>>> test from 1st vm
cat /srv/lv1/2test.txt
>>> no such file

additional info:
1. no lock configured;
2. if i do same steps on physical hosts, all works good;
3. shared disk config :
<disk type='block' device='disk'>
<driver name='qemu' type='raw'/>
<source dev='/dev/mapper/360002ac0000000000000003200019bcc'/>
<target dev='sdd' bus='scsi'/>
<address type='drive' controller='0' bus='0' target='0' unit='1'/>
alse tried with different disk options, such as:
<driver name='qemu' type='raw' cache='none' io='native'/>

Any idea, how to resolve this issue?

Thank You!