On Wed, Dec 28, 2016 at 08:14:36PM +0100, Edgar Fu? wrote: > > You must be misremembering something. > Looks like it. > > So disklables are a BSD thing, not a DEC thing?
Ultrix has a disklabel format, and I've moved drives from VAX to MIPS Ultrix systems, so the answer really is "it depends". I have also booted Ultrix kernels on systems installed with plain 4.2BSD, however, and I didn't lose access to my drives, so I assume (new-enough) Ultrix had both the DEC disklabel support and the old compiled-in partitioning as a fallback. For non-boot drives, you can use disktab, right? In that case I can't recall how the partition boundary information actually gets to the kernel. Do our VAX disk drivers for Unibus/Massbus hardware retain the compiled in partitioning as a fallback? Without it, it'd be tough to even read old Unix filesystems without modifying the disk contents (to write either an Ultrix or 4.4BSD label into place). -- Thor Lancelot Simon [email protected] Ring the bells that still can ring.
