Working steps for anyone interested (based on Marek & Tomhet's posts:
https://groups.google.com/forum/#!topic/qubes-users/RogG5rXG_Pw/discussion)
> Use case: I want to store my Documents on a separate .img (on same Qubes SSD)
> so that only config files remain on my appVM. This should ease the upgrade
> process when I want to start with fresh appVMs and reduce chances of user
> error / corruption of frequently moving large existing files.
1. create sparse file in dom0:
truncate -s 10G /var/lib/qubes/storage/myfiles.img
2. create filesystem on sparse file:
mkfs.ext4 myfiles.img
3. set up Qubes-RPC in dom0:
add to /etc/qubes-rpc/attach-myfiles.img:
/usr/bin/qvm-block -A --force-root -f xvde myappVM
dom0:/var/lib/qubes/storage/myfiles.img
add to /etc/qubes-rpc/policy/attach-myfiles.img:
myappVM dom0 allow
$anyvm $anyvm deny
4. set up fstab in appVM:
add to /rw/config/fstab:
/dev/xvde /home/user/storage ext4 defaults,noatime,discard 0 0
5. set up rc.local in appVM:
add to /rw/config/rc.local
cat /rw/config/fstab >> /etc/fstab
qrexec-client-vm dom0 attach-myfiles.img
mount -a
6. umount & detach will happen automatically when appVM shuts down.
Thanks everyone for help!
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