Re: Backup using dump and restore from dvd - restore cd loaded to ram ?drive?
- From: John Nielsen <lists@xxxxxxxxxxxx>
- Date: Mon, 19 Feb 2007 10:47:39 -0500
On Monday 19 February 2007 10:29, Oliver Fromme wrote:
knizek@xxxxxxxx wrote:
> [...]
> The restore method will then require to boot from a bootable CD. The
> rescue CD system should load itself into RAM drive, so that I can
> dismount it and replace it with the CD/DVDs with the backup files.
>
> The rescue CD should provide basic commands and programs like mount*,
> newfs, bsdlabel, fdisk, vi, restore, gzip, ...
>
> I have tried the installation CD with FreeBSD 6.2, but its "holographic"
> shell does not have the commands needed and the FixIt shell depends
> on the CD.
Building such a bootable CD is possible (I've done it),
but it's not easy.
Bascially you have to do it similar to the FreeBSD
install CD. I suggest you have a look at it. What
you have to do is prepare a kernel for the CD which
has the MD_ROOT option, so it can use an "mfs image"
as the root file system. The create such an image
and put it onto the cd. On the FreeBSD install CD
it is located in /boot/mfsroot.gz (you can uncompress
it and then mount it via mdconfig). Actually you
should be able to make a bigger mfsroot image and
add the tools that you need. However, be aware that
the image will eat up physical RAM, so don't be too
wasteful.
A simpler solution for your restore problem would be
to simply use a standard FreeBSD installation CD,
then make a minimal installation on your hard disk
so you have all the tools that you need, then restore
your actual backups.
There's a ready-made FreeBSD bootable CD called Frenzy that has an option to
load itself into memory. I'd suggest getting the "lite" (smaller) version so
the memory requirements aren't so great. Check it out:
http://frenzy.org.ua/eng/
I've used it to do DVD operations under a "real" OS on a computer that wasn't
running one (namely my wife's laptop). Works like a treat. I believe FreeSBIE
is planning on adding such a feature as well but I don't think they have it
yet.
JN
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