Locking a file backed mdconfig into memory

[Dave Hayes]

Clifton Royston <cliftonr at lava.net> writes:
> It sounds like what you really want is to load the contents of the
> specified file as a memory system?  That's not part of mdconfig's
> repertoire, to the best of my recollection.  

So if, in /etc/loader.conf, I do this:

 rootfs_load="YES"
 rootfs_type="mfs_root"
 rootfs_name="/mfsboot"
 vfs.root.mountfrom="ufs:md0"

and /mfsboot comes from a bootable DVD, am I to assume that this mount
is under the same constraint? Specifically, this constraint is that the
/mfsboot file (and hence the DVD) will be read repeatedly if the system
is under memory pressure.

> If that's what you want, you need to use a different tool; the purpose
> of mdconfig is to provide scratch disk.  The backing store is to
> specify a region its contents can be swapped out to if the system is
> under memory pressure (which certainly won't work with a DVD)

Heh. Certainly I am using tools for purposes which may not match the
original intention. If I wanted to run the rootfs on a memory device
which did -not- swap to the backing store of /mfsboot, how would I go 
about doing that?
-- 
Dave Hayes - Consultant - Altadena CA, USA - dave at jetcafe.org 
>>> The opinions expressed above are entirely my own <<<

Faith (n): The quality by which we believe what we would
otherwise think was false.