Re: Fusion MPT Ultra320 disks detected as Ultra2

[Uprooter <uprooter@gmail.com>]

On Sunday 13 December 2009 13:50:42 James Bottomley wrote:
> On Sun, 2009-12-13 at 12:58 +0200, Uprooter wrote:
> > Hello James and thanks for trying to help.
> >
> > Unfortunately changing min_period  didn't solve anything.
> > # pwd
> > /sys/class/spi_transport/target2:0:1
> >
> > localhost target2:0:1 # echo 25 > min_period
> > localhost target2:0:1 # echo 1 > revalidate
> > I did it for both disks.
> > #dmesg | tail -10
> > target2:0:0: Beginning Domain Validation
> >  target2:0:0: Domain Validation skipping write tests
> >  target2:0:0: Ending Domain Validation
> >  target2:0:0: Beginning Domain Validation
> >  target2:0:0: Domain Validation skipping write tests
> >  target2:0:0: Ending Domain Validation
> >  target2:0:1: Beginning Domain Validation
> >  target2:0:1: Domain Validation skipping write tests
> >  target2:0:1: Ending Domain Validation
> >  target2:0:1: Beginning Domain Validation
> >  target2:0:1: Domain Validation skipping write tests
> >  target2:0:1: Ending Domain Validation
> >
> > # cat min_period
> > 25
> > # cat period
> > 50
> 
> OK, so I'd suspect a cabling problem.  50ns is the minimum period for a
> single ended bus.  You have to move to LVD to get anything beyond.  I'd
> say something in your SCSI cable chain is keeping the bus SE.
> 
> James
> 

Well I opened the server. nothing much to play with everything is tied up and 
I don't think anything except maybe disks has been changed since this server 
was bought.
Can It be related to disk jumper settings ? Anything else you can think of ?