On 12 October 2016 at 07:57, Giuliano Procida <giuliano.procida@gmail.com> wrote: >> array_position=4294967295 > > This should be 1 instead. This is 32-bit unsigned 0xf...f. It may be > that it has special significance in kernel or LVM code. I've not > checked beyond noticing one test: role < 0. http://lxr.free-electrons.com/source/drivers/md/dm-raid.c Now role is an int and the RHS of the assignment is le32_to_cpu(...) which returns a u32. Testing < 0 will *never* succeed on a 64-bit architecture. This is a kernel bug. If the code is changed so that role is also u32 and the test is against ~0, it's possible that different, better things will happen. Please try reporting this to the dm-devel people. I still don't know what wrote that value to the superblock though. _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/