Re: SCSI speed for SGI O2 and additional controller

[Thiemo Seufer <ica2_ts@csv.ica.uni-stuttgart.de>]

Giuseppe Sacco wrote:
> Hi all,
> I am just starting using this O2 and I found the disk access is *very* 
> slow. The internal controllers seems to be adaptec AIC7880 and the speed 
> for each device is 3.3 MB/s as shown in /proc/scsi/aic7xxx/0:
> Target 1 Negotiation Settings
>        User: 3.300MB/s transfers
>        Goal: 3.300MB/s transfers
>        Curr: 3.300MB/s transfers

Which means the aic7xxx driver fails to handle faster SCSI transfer
modes than the (slowest) asynchronous one.

> Do you know if this is the maximum speed for this controller?

IIRC it can do 10MB/s.

> I have a 
> spare SCSI PCI card from Advansys, may I plug it into the SGI and use it 
> for all my harddisks? Should I leave one disk in the internal controller 
> in order to boot?

Might work, but I haven't tried something like that. Anyway, the
correct answer is to fix the kernel driver. :-)


Thiemo