Solved! > -----Original Message----- > From: Jason Pyeron > Sent: Wednesday, August 27, 2014 0:43 > > > -----Original Message----- > > From: Jason Pyeron > > Sent: Wednesday, August 27, 2014 0:09 > > > > > -----Original Message----- > > > From: John R Pierce > > > Sent: Tuesday, August 26, 2014 20:11 > > > > > > On 8/26/2014 5:03 PM, Jason Pyeron wrote: > > > > What am I doing wrong here? > > > > > > A) you don't create anything in /dev, the driver should be > > > using devfs > > > to create its own devnodes on the fly as needed. > > > > I assumed such, but it did not work. > > > > > > > > B) you apparently never loaded the driver. see > > > http://www.atcomputing.nl/Tools/cowloop/loadunload.html > > > > > > > 3.2.0.1 says: > > > > root at localhost ~/cowloop-3.2.0.1 > > # cat RELEASENOTES.3.2.0 > > This is version 3.2 of the Copy on Write loop driver 'cowloop' > > by ATComputing in Nijmegen, The Netherlands. > > Release date: September 2009. > > ---- > > > > Cowloop wil be part of the 2.6.31 kernel. This has lead to some > > changes in the cowloop utils. Obviously the kernel module has > > been removed from the distribution, only the utilities remain. > > > Per http://en.wikipedia.org/wiki/Cowloop > > Cowloop (copy-on-write loop driver) was a Linux kernel driver > ... Cowloop is now largely deprecated in favor of the > device-mapper snapshot target which provides the same functionality. > > On to learning device mapper, > https://www.kernel.org/doc/Documentation/device-mapper/snapshot.txt IMGLOOP=$(losetup -fr --show /root/oldhd.img) dd if=/dev/zero of=/root/oldhd.cow bs=1 count=0 seek=$(wc -c < /root/oldhd.img) COWLOOP=$(losetup -f --show /root/oldhd.cow) echo 0 `blockdev --getsz $IMGLOOP` snapshot $IMGLOOP $COWLOOP p 4 | dmsetup create cowimg kpartx -av /dev/mapper/cowimg -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - Jason Pyeron PD Inc. http://www.pdinc.us - - Principal Consultant 10 West 24th Street #100 - - +1 (443) 269-1555 x333 Baltimore, Maryland 21218 - - - -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This message is copyright PD Inc, subject to license 20080407P00.