[Discuss] How do you backup "/" with rsync?

[John Blomfield]

Alan W. Irwin wrote:
> On 2007-12-11 19:07-0800 Steven Kurylo wrote:
>
>> Its quite possible for the BIOS to see the internal drive as the first
>> boot device, which then loads grub.  Grub loads the menu.lst and then
>> the kernel from the internal drive.  Once the kernel is running, it
>> could then load eSata controller, making the external drive sda, then
>> load the ICH9 controller, making the internal drive sdb.  Then once
>> the kernel starts mounting your fstab, it uses the sda like you've
>> specified - but sda is the external drive.
>>
>> That would explain what you saw.
>
> I think you must be right.  That grub menu refers to hd0 and hd1 but 
> at grub
> time the kernel is not loaded yet so hd[01] must correspond to the 
> BIOS idea
> of what are the first and second disk devices, and not the kernel's 
> idea of
> what are the first and second disk devices.  This conclusion seems to be
> confirmed by
Coincidentally, we seem to have had similar thoughts.  See my earlier email.

John
> http://blogs.sun.com/jerrysblog/entry/svm_root_mirroring_and_grub 
> where he
> refers to the BIOS's idea of drive order when considering grub's disk 
> order.
> Presumably, there must be a more official grub reference on this 
> question,
> but I cannot find it.
>
> It sure complicates Linux life when the BIOS and grub sometimes have a
> different disk order convention than the Linux kernel, but I guess we are
> stuck with this complication (at least until all MB manufacturers go with
> LinuxBIOS rather than proprietary BIOS's).
>
> Alan
> __________________________
> Alan W. Irwin
>
> Astronomical research affiliation with Department of Physics and 
> Astronomy,
> University of Victoria (astrowww.phys.uvic.ca).
>
> Programming affiliations with the FreeEOS equation-of-state 
> implementation
> for stellar interiors (freeeos.sf.net); PLplot scientific plotting 
> software
> package (plplot.org); the libLASi project (unifont.org/lasi); the 
> Loads of
> Linux Links project (loll.sf.net); and the Linux Brochure Project
> (lbproject.sf.net).
> __________________________
>
> Linux-powered Science
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