RE: Problem with random disks mount sequence

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Alan Cox wrote:
>Tim <ignored_mailbox@xxxxxxxxxxxx> wrote:
>
>> On Wed, 2007-12-12 at 09:36 +0100, wwp wrote:
>> > That still doesn't explain why the order of mounting (and of scsi
>> > discovering?) is shuffled 
>> 
>> I'm sure it was explained somewhere in this thread.  The device names
>> are named in the order that the BIOS discovers them.  If it 
>checks the
>> USB ports first, they get the names first.
>
>The kernel order depends on the load order of drivers not the 
>BIOS order.
>The BIOS order information is there via the EDD interface and could in
>theory be used to make links but afaik nobody uses it.
>
>BIOS order is also far weaker than labels as it may change when a drive
>fails or you swap a card.
>
>Alan
>

Well, I have an old VA Linux Systems 504, and in my case there
was absolutely nothing I could do to force the Bios/load order
as it appeared that the drives were being loaded scsi first then
the IDE drives.

I had one helluva time trying to install Fedora 8 in this way,
and I have tried many times to try to get Grub right.  I gave up
relying on the F8 LiveCD to define the drive order so I basically
disconnected all of my SCSI and IDE drives sans IDE-0 PM drive.

I was then able to install F8 LiveCD on the *right* drive and then
once I got that one drive working, I proceeded to fold in the other
drives one-by-one and built up each drive/partition so that I was
able to spread the files around evenly across drives/partitions.

I did notice in F8-LiveCD that there was this one place in Grub
Advanced configuration that *seemed* to allow me to change the
drive order to which I could apply the MBR but the device names
(sda-sdd) remained the with the physical drive (IDE-SCSI) so that
did not help much. F8-LiveCD sees drives much *differently* than
when booting directly off the MBR HD drive itself, or so it seems.
For example: In F8 LiveCD, it sees drives:

sda = scsi drive 3
sdb = scsi drive 4
sdc = IDE-0 PM
sdd = IDE-0 PS

But when I completed installation and booted off the drives directly,
it sees:

sda = IDE-0 PM
sdb = IDE-0 PS
sdc = scsi drive 3
sdd = scsi drive 4

See the "flip"? That is why I had to get the IDE-0 PM drive ALONE during
install so that when it came to booting off the target boot drive - all the
other drives fall in proper order.

Yeah, that was a pain - but I got it to work.  The last update before
F8 was FC4 - which is why I do not do Fedora installs too often.  Brings
back very painful memories. ;)

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