[Casper] Disk identifier order at boot

[Miles Leacy]

Do you know in what order Open Firmware and EFI scan the buses to build the
device tree?

----------
Miles A. Leacy IV

 Certified System Administrator 10.4
 Certified Technical Coordinator 10.5
 Certified Trainer
Certified Casper Administrator
----------
voice: 1-347-277-7321
miles.leacy at themacadmin.com
www.themacadmin.com




On Mon, Dec 22, 2008 at 11:53 AM, Patrick Gallagher <
patrick at digitalpeaks.com> wrote:

> Hi, Miles.
> On Dec 19, 2008, at 10:01 AM, Miles Leacy IV wrote:
>
> Hi All,
> I'm stumped by the following question...
>
> In what order are disks assigned disk identifiers at boot time?
>
> I know that disk identifiers are assigned in the order in which the disks
> are attached to the system.  If you had an iMac with an internal SATA and
> booted from that SATA, it would be disk0.  If you then inserted an optical
> disc, the optical would be disk1.  Finally, if you attached a firewire
> drive, that drive would be disk2.
>
> The question is, what happens at boot if you have three internal SATA
> disks, an optical disk inserted (ATA) and a USB drive attached?
>
> I assume there is an order in which the buses are scanned for disks, and
> therefore an order to disk identifier assignment.  Does anyone know what
> that order is?
>
>
> AFAIK, this is hardware dependent.  Nearly as I've been able to tell, the
> order is determined by the order set in the device tree built by the
> firmware.
>
> PG
>
>
> Thanks,
>
> ----------
> Miles A. Leacy IV
>
>  Certified System Administrator 10.4
>  Certified Technical Coordinator 10.5
>  Certified Trainer
> Certified Casper Administrator
> ----------
> voice: 1-347-277-7321
> miles.leacy at themacadmin.com
> www.themacadmin.com
>
>
>
> --
>
> Patrick Gallagher
>
> Digital Peaks Corporation
>
> 303-284-4972
>
>
>
>
>
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