SCSI geometry calculation?

[Scott Long]

Nate Lawson wrote:
> On Wed, 14 May 2003, Scott Long wrote:
> 
>>>Most drivers use >1G: 255/63, else 64/32.  Exceptions are:
>>>* aac - >=2G: 255/63, >=1G 128/32, else 64/32
>>>* aha - same
>>>* bt - same as aha
> 
> 
> Why are aha and bt using an extra 2G step instead of the normal 1G step?
> They're not RAID controllers.  Did you use that geometry for aac
> intentionally or was it just a cut/paste?
> 

The aac definition was taken from the aac spec.  The aac spec
coincidentally is similar to other adaptec products, though Justin
can speak definitively on aic7xxx/aic79xx.

> 
>>I'm really not sure what to say
>>about the boundary cases other than if they are buggy, few people
>>notice.
> 
> 
> Would it be ok to move them all to > and not use >=?
> 

Probably yes, though it might be useful to get build some experimental
evidence first.

Scott