Date: Sat, 31 Jan 2004 19:54:02 +0100 (CET) From: Cordula's Web <cpghost@cordula.ws> To: bjorn@eikeland.info Cc: freebsd-questions@freebsd.org Subject: Re: Transferring the root filesystem to a ramdisk? Message-ID: <20040131185402.F120040824@fw.farid-hajji.net> In-Reply-To: <opr2m868m9omdbx5@localhost> (message from Bjorn Eikeland on Sat, 31 Jan 2004 15:29:22 %2B0100) References: <20040131140833.69B9540823@fw.farid-hajji.net> <opr2m868m9omdbx5@localhost>
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> > 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'm probably in over my head here, but; > chroot should change the root filesystem for you. > (look in the manpages for more details) Nope, chroot(2) affects only the calling process, not the whole system. > 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 ATAidle is great. Just tried it successfully on a 5.2-RELEASE with two drives. powering down the inactive drive (not the one with swap and root-fs) is possible this way. Thanks, -cpghost. -- Cordula's Web. http://www.cordula.ws/
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