Well..

That dindn't helped..
still getting cmd_abort and
XFS: bad magic number
XFS: SB validate failed
attempt to access beyond end of device
dm-6: rw=0, want=354, limit=352
isofs_fill_super: bread failed, dev=dm-6, iso_blknum=88, block=176
UDF-fs: No VRS found
XFS: bad magic number
XFS: SB validate failed

looks like I'll trash Open-e and use GNBD, since I need a working solution..

cheers

Matthias