Without any spare space, you may be able to back up each /usr partition and then reconfigure and restore. You would need to plan carefully -- for example, during this procedure you would want to execute in single-user mode, or boot from another drive, as none of the libraries in /usr/lib or any utilities in /usr/bin, /usr/sbin, or /usr/libexec would be available during the time /usr was unmounted. Most applications will not run without /usr.
Your "df" output does not show the physical location of each partition on wd0; you will need to review the drive's disklabel(8) to properly plan such a reconfiguration.
If the system has a CD or DVD drive, you may find the link in my signature helpful for running an alternate system while reconfiguring your /usr partitions.
Last edited by jggimi; 20th August 2012 at 01:51 PM.
Reason: added /usr/lib.
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