Now with the advent of ZFS, it is becoming less important, but it is still a really "good to know" thing. And, oddly, it is difficult to find the information with a google search. So I thought I'd better preserve it here.
First, boot into your emergency boot device of choice: cdrom, network boot, or whatever. (In theory, you might even be able to follow this information when booted off your regular disks in single user mode, but I havent tested that)
The idea is to force the in-memory disk suite driver to take on your "normal" disksuite configuration, which we do as follows (edit as appropriate for your rootdisk):
mount -o ro /dev/dsk/c0t0d0s0 /a cp /a/kernel/drv/md.conf /kernel/drv/ umount /a update_drv -f md # (wait a min, and dont worry about the following expected error) # devfsadm: mkdir failed for /dev 0x1ed: Read-only file system metasync d0 # (If it whines about "No such file or directory", just wait a little # longer, or try running metastat to wake it up) mount /dev/md/dsk/d0 /a # dont forget to sync and mount any other filesystems, ie: /usr
This material is copyrighted by Philip Brown