am2 MBs - 4g + SCSI wipes out root partition

[JoaoBR]

On Saturday 11 October 2008 13:26:29 Adam McDougall wrote:
> Jeremy Chadwick wrote:
> > On Sat, Oct 11, 2008 at 04:45:29PM +0200, Gary Jennejohn wrote:
> >> On Sat, 11 Oct 2008 03:13:16 -0700
> >>
> >> Jeremy Chadwick <koitsu at FreeBSD.org> wrote:
> >>> On Sat, Oct 11, 2008 at 11:30:57AM +0200, Gary Jennejohn wrote:
> >>>> On Fri, 10 Oct 2008 14:29:37 -0300
> >>>>
> >>>> JoaoBR <joao at matik.com.br> wrote:
> >>>>> I tried MBs as Asus, Abit and Gigabyte all same result
> >>>>>
> >>>>> Same hardware with SATA works perfect
> >>>>>
> >>>>> Same hardware with scsi up to 3.5Gigs installed works perfect
> >>>>>
> >>>>> what calls my attention that all this MBs do not have the memroy hole
> >>>>> remapping feature so the complete 4gigs are available what normally
> >>>>> was not the case with amd64 Mbs for the Athlon 64 CPUs
> >>>>>
> >>>>> some has an opinion if this is a freebsd issue or MB falure or scsi
> >>>>> drv problem?
> >>>>
> >>>> It's a driver problem.  If you want to use SCSI then you'll have to
> >>>> limit memory to 3.5 GB.
> >>>
> >>> What you're saying is that Adaptec and LSI Logic SCSI controllers
> >>> behave badly (and can cause data loss) on amd64 systems which contain
> >>> more than 3.5GB of RAM.  This is a very big claim.
> >>>
> >>> Have you talked to Scott Long about this?
> >>>
> >>> Please expand on this, and provide evidence or references.  I need to
> >>> document this in my Wiki if it is indeed true.
> >>
> >> See the freebsd-scsi thread with Subject "data corruption with ahc
> >> driver and 4GB of memory using a FBSD-8 64-bit installation?" from Wed,
> >> 30 Jan 2008.
> >>
> >> This was for ahc, but the bit-rot which Scott mentions in his reply
> >> might also apply to the LSI Logic controllers.
> >>
> >> Basically the driver doesn't correctly handle DMA above 4GB.  Since the
> >> PCI hole gets mapped above 4GB it causes problems.  the (S)ATA drivers
> >> don't seem to have this problem.
> >
> > Thank you -- this is the exact information I was looking for.
> >
> > I will update my Wiki page to reflect this quite major problem.
>
> I am using some LSI (mpt driver) ultra4 (U320 scsi) and LSI SAS
> controllers in FreeBSD 7.x amd64 with 20G of ram, and Adaptec (aac
> driver) with a 5th generation RAID card with 8G of ram, both have no
> such corruption problems.  Providing this as a counter-example just to
> document some evidence of which products seem to work fine.
> _______________________________________________


well this for sure is NOT a AM2 MB but any server MB which indeed run fine as 
Tyans, SMs and others I guess




-- 

João







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