On Aug 12, 2014, at 10:32 AM, Barney Cordoba <barney_cord...@yahoo.com> wrote:

> A continuing issue (with 9.1 previously and now 10) is that FreeBSD 
> occasionally (or always) seems to boot from the 2nd installed drive
> rather than the first. I'd be happy to debug this, but I have no idea if it's 
> bootcode or a BIOS issue. Supermicro pleads innocent, but their bios
> guys are hard to work with and fairly arrogant if you don't specifically 
> isolate something.
> The scenario occurs when ada0 is upgraded and has an incompatible kernel with 
> other code on drive ada1.  (note that ada1 is a backup of the pre-upgrade 
> ada0, so it's fstab points to ada0 for mount points). The system will boot 
> and then modules will fail to load. It loads the kernel from
>  ada1 and then mounts partitions from ada0; old kernel and newer modules.
> The problem is resolved by popping the 2nd drive. So there is nothing wrong 
> with ada0 to cause it to bounce to ada1.
> My question: What would cause the system to boot from ada1 instead of ada0? 
> Bios or Bootcode?

BIOS, most likely. If the disk controller in question is onboard you should be 
able to specify which disk(s) and what order they will be booted from. If not, 
you'll need to just say <disk controller> in the BIOS boot order then go to the 
controllers BIOS to say which disk(s) to boot from and in what order. I have 
recent experience with a SuperMicro box and an LSI controller; the latter 
allows you to specify a (b)oot drive and an (a)lternate. Yes, b comes before a. 


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