vinum problems

[Greg 'groggy' Lehey]

On Tuesday, 16 November 2004 at 23:10:22 -1000, Gary Dunn wrote:
> On Tue, 2004-11-16 at 08:51, Chris Smith wrote:
> [snip]
>> ... Can you boot off a striped volume and will it
>> benefit me at all making it a striped volume at all rather than a
>> concat?
>
> I don't think you can boot off a vinum partition, because you have to
> load vinum *after* the kernel is running. It usually loads early during
> the run through /etc/rc as the system goes multiuser, before visiting
> /etc/fstab with mount. Perhaps you have your root partition on another
> disk and just didn't mention it? Or is there a tricky way to do this
> that I am ignorant of?

There's a tricky was to do this; apparently you're ignorant of it :-)
It's described in the man page and at
http://www.vinumvm.org/cfbsd/vinum.pdf .

Basically, it involves overlaying the Vinum subdisk with a BSD
partition for booting.  This means that the plex must be concat.
Striped plexes have a layout that is incompatible with BSD partitions.

To answer Chris's other question: no, I can't see any particular
advantage.

Greg
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