> Hi Mikulas > > I send to You (in attachment) files from both kernels.Thank You for help > > Best Thanks. Does your workload involve just one snapshot of a given volume, or do you have more snapshots of the same volume? Do you write only to origin or to both origin and the snapshot or only to the snapshot? I will send you some patch with more debug tests soon, just answer these questions first, so that I can make it. Mikulas -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel