Date: Fri, 28 May 2010 10:57:29 -0700 From: Dave Hayes <dave@jetcafe.org> To: Clifton Royston <cliftonr@lava.net> Cc: freebsd-stable@freebsd.org Subject: Re: Locking a file backed mdconfig into memory Message-ID: <201005281757.o4SHvTwq020905@hugeraid.jetcafe.org> In-Reply-To: <20100528043006.GA18560@lava.net> References: <201005272348.o4RNmgWh014243@hugeraid.jetcafe.org> <20100528043006.GA18560@lava.net>
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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. > 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@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.
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