can I change probe order of mpt controllers?

[Scott Long]

Vivek Khera wrote:
> I have a shiny new Sun X4100 here and it works pretty well (except that 
> there is a bug in the ILOM bios that refuses to let the serial port 
> console run at 115200!!!)
> 
> I attached an external RAID array using an LSI fibre channel card, and 
> now the boot disk is not found after the kernel boots.  Ie, it can't 
> find the root volume.  This is because the fibre channel card is probed 
> as mpt0 and the on-board disks are connected to mpt2.  (Where's mpt1?  
> no idea.)  Once the RAID volume was initialized, the ordering of the 
> disk device names changed.
> 
> Is there some way to force the boot drive controller to be probed first 
> and be mpt0?  Or is there some way to force the boot drive to be a fixed 
> device name?
> 
> I'm planning to play with the RAID configuraitons and change partitions 
> and add logical drives, etc., so this will be painful to reconfigure the 
> OS every time I reconfigure the RAID.  Any advice will be appreciated.  
> Thanks!
> 
> I'm running 6.2/amd64 from a fresh CD install.
> 

Look in /sys/conf/NOTES for a long discussion on wiring SCSI device order.

Scott