Well it's better to use three file system for R/O Linux Guest as described at IBM Redbook "Linux on IBM zSeries and S/390: Large Scale Linux Deployment" (file sg246824.pdf). The main idea is in using "bind" mounts introduced in 2.4 kernel. So IPL proccess of Linux guest looks like following: 1) IPL and take /ets/fstab from base root filesystem, mount new guest root somewhere in /mnt (or other place), bind mount (R/W) /mnt/guestvol/etc -> /etc, /mnt/guestvol/var -> /var/ and so on, then send SIGHUP to init proccess to restart. It takes new /etc and go on new init ... :)
-- With Best Regards Ivan D. Synytsyn HetNet LS company Russian Federation
