this does not solve the issue of scaling to window size as window size is dynamically resized by dragging to new size

(Copying the 4tb did in fact work despite very slow copy. zfs import -d /dev -f poolname once /dev/loop0 was setup.)

Normally I should have gotten "/dev/sdf1: not a directory" from the -d option, not sure why. If one uses -d /dev, then the whole dev is scanned, /dev/sdd and sde are touched and things wedge. Could just mkdir ~/poolname; cd ~/poolname; ln -s /dev/sdf1; ln -s /dev/sdg1; zfs import -d . poolname newpoolname, but it says "cannot import poolname: no such pool available" - as in the pool is still mounted/imported. Exporting doesnt work because of processes stuck on the existing mountpoint for poolname (which also cant be killed with -9 or otherwise). So that's no help.

again, this doesn't work (on debian I havent found a solution, there's no /etc/sysconfig/bash-prompt-screen). Hitting enter at the prompt on a Centos box i'm ssh'd into resets the window title on me immediately. I can do a unset PROMPT_COMMAND on the system in question, but I'd have to do that on every system preemptively I share logins (as root... sigh) with others. There must be a way to have screen protect itself from modifications from client windows (if not I sense a security problem).