Date: Sat, 31 Jan 2004 15:29:22 +0100 From: Bjorn Eikeland <bjorn@eikeland.info> To: cpghost@cordula.ws, "freebsd-multimedia@freebsd.org" <freebsd-multimedia@freebsd.org> Subject: Re: Transferring the root filesystem to a ramdisk? Message-ID: <opr2m868m9omdbx5@localhost> Resent-Message-ID: <opr2m9aphqomdbx5@localhost> In-Reply-To: <20040131140833.69B9540823@fw.farid-hajji.net> References: <20040131140833.69B9540823@fw.farid-hajji.net>
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I'm probably in over my head here, but; chroot should change the root filesystem for you. (look in the manpages for more details) As for powering down the hdd I did find a page for this, but havent had time to play with it yet: http://www.cran.org.uk/bruce/software.php best of luck! > Hello, > > in an attempt to save power on FreeBSD servers, I'm > trying to replace the hdd with a ramdisk. The idea is to: > > 1. boot from the hdd (or netboot from an NFS server) > 2. configure a ram disk (md(4)) > 3. copy everything that's needed to ram disk > 4. transfer kernel root to ramdisk (*) > 5. turn off the hdd (**) > > (*) is the hairy question. > (**) How can that be done? > > I won't need paging, because there'll be enough ram for > everything (ramdisk, kernel and userland). > > Now the questions are: > > * How to "attach" the root filesystem to the ram disk? > > Can this be done only through pxe/netboot before the > kernel starts, or is there some kind of system call > that can transfer root on a running system? > > * How to power off (and on) the hdd (both for ATA and SCSI)? > > * Will the power consumption decrease (no hdd) or will > it increase (more ram)? Anybody measured this before > with regular diskless machines? > > Thanks, > -cpghost. > _______________________________________________ freebsd-multimedia@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-multimedia To unsubscribe, send any mail to "freebsd-multimedia-unsubscribe@freebsd.org"
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