> I was running something similar. Now I seem to have run out of loop
> devices ): Reboot time by the look of it.

cat /etc/modprobe.d/loop-dev
# Increase number of loop devices.
# Adding this to grub doesn't work any more for SUSE 10.1. Add it here and run
# mkinitrd. (#188242)
options loop max_loop=24

Even kernel command arg stage is too late, needs to go initrd.

> From what I've read, the offset is interpreted as blocks.

Check the source! Last time I did that it was definitely effectively in
bytes, but I don't recall when and what kernel version that was.

2.6.18, man losetup says

       -o offset
              The  data start is moved offset bytes into the specified file or
              device. Normally offset is included in IV  (initialization  vec-
              tor)  computations. If offset is prefixed with @ character, then
              offset is not included in IV computations. @ prefix  functional-
              ity  may  not  be  supported  on  some older kernels and/or loop
              drivers.

Volker

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