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Date: Fri, 28 May 2010 21:13:16 +0300
From: Andriy Gapon <avg@icyb.net.ua>
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To: Dave Hayes <dave@jetcafe.org>
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Cc: freebsd-stable@freebsd.org, Clifton Royston <cliftonr@lava.net>
Subject: Re: Locking a file backed mdconfig into memory
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on 28/05/2010 20:57 Dave Hayes said the following:
> Clifton Royston <cliftonr@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.

No. Contents of mfsboot is loaded into physical memory and always stays there.

-- 
Andriy Gapon