Patrick: > Yup .. didnt see them in the first place .. it's "aufs > parse_opts:540:mount[2056]: lookup failed /real_root (-2)
This is one of the most important message. The value -2 means ENOENT, and you were right. aufs could not find /real_root. Currently, you cannot change your branch mode. ---------------------------------------------------------------------- > just digged through the strace log myself .. seems as if it was > /etc/fstab related .. now that I changed one fstab entry from "unionfs / > unionfs 0 0" to "aufs / aufs 0 0" there's another error: > > mount: / not mounted already, or bad option > failure bad /proc/mounts 1 > > + another strace log which is again attached. I thought /etc/fstab was > not related but /etc/mtab was? while I only adapted /etc/fstab (without > rebooting) mount acts totally different. Thank you for your two strace logs. The first one shows, - mount(8) searches /sbin/mount.unionfs and fails - mount(2) returns EINVAL because aufs returns "lookup failed /real_root (-2)" The second shows, - mount(8) searches /sbin/mount.aufs and executes it - /sbin/mount.aufs returns an error "failure bad /proc/mounts 1" because of an mis-match between /etc/mtab and /etc/fstab, probably. You showed me your /proc/mounts, and there were aufs entries. none / aufs rw,xino=/new/.aufs.xino,br:/new=rw:/real_root=ro 0 0 none /dev/.static/dev aufs rw,xino=/new/.aufs.xino,br:/new=rw:/real_root=ro 0 0 Assuming your /proc/mounts is unchagned, your modification to fstab is wrong. aufs / aufs 0 0 should be none / aufs 0 0 since you mounted as 'none.' - If you modified fstab correctly, the result "lookup failed /real_root (-2)" would not change since your /real_rool is hidden. If you mount your root filesystem manually with specifying both of "dev" and "mntpnt", the root entry in /etc/fstab is unnecessary, usually. If you really need to remount your aufs, I will try addning new remount options which handle the branch index instead of branch path. It may work, but I am not sure. You seem to be just trying aufs, and don't need the new options actually, do you? Junjiro Okajima ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV