F7T4 DVD rescue mode question

[Jesse Keating]

On Friday 27 April 2007 16:39:30 John Reiser wrote:
> The "rescue image" is on the install CD/DVD that you just booted.
> The process is now general enough that you could have booted
> from boot.iso, pxeboot, usb stick or other image, which contain
> only enough to boot, and not enough to perform rescue operations.
> In those cases you need to find the rest of the rescue software,
> which might be on nfs, http, ftp, CD/DVD, harddisk, ...

Except that if the kernel can read your CD drive, anaconda will check there 
first for the rescue media.  If it can't find it is when you get asked, so 
something is up with this person's system in that the kernel may not be able 
to read the CD drive once booted.

> > If it's the former (which seems counterintuitive), selecting "Local
> > CDROM" at this point causes the DVD to eject.
>
> Re-load the install CD/DVD, which contains everything needed for
> rescue mode.  Rescue mode should proceed.  [You might have booted
> a boot.iso CD-ROM in order to get a recent Linux kernel, but still
> have the rescue software on another platter (which might be older,
> for instance.)]
>
> > If it's the latter, the program (Anaconda?) demands to know the
> > location of a Fedora iso somewhere on my /dev/sda1 (/boot) or /dev/sda2
> > (LVM /).
> >
> > This no longer seems to work like the rescue feature I'm accustomed
> > to.  
>
> The ability to use an install CD/DVD for rescue mode is new.

No it's not.  "Rescue" mode is achieved by passing "rescue" to the kernel 
argument line at boot time.  Anaconda will see that and launch into rescue 
mode.  ANY boot media can lead  you to rescue mode.

> The ability to use the rescue CD-ROM as an installer also is somewhat new.

No it's not.  You've just about always been able to just type "linux" at the 
rescue boot prompt to get to the full installer.  The default does "linux 
rescue" to invoke the rescue mode.  The rescue media just includes enough 
anaconda to run rescue, and defaults to passing "rescue" to the installer.

-- 
Jesse Keating
Release Engineer: Fedora
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