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.
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