Sorry for resuming this tread after years (!).
I've the some problem.
HN1:~# dd if=nameserver.243.img of=/dev/iscsi-vg/vm-106-disk-1
12582912+0 records in
12582912+0 records out
6442450944 bytes (6.4 GB) copied, 615.338 s, 10.5 MB/s
Tried to set BS=1024:
HN1:~# dd if=vm-105-disk-1.raw...