am2 MBs - 4g + SCSI wipes out root partition

[JoaoBR]

On Saturday 11 October 2008 13:52:50 Jeremy Chadwick wrote:
> On Sat, Oct 11, 2008 at 12:26:29PM -0400, 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.
>
> Is your LSI SAS controller driven by mpt(4) or mfi(4)?
>
> Let's break down what we know for sure at this point:
>
> aac(4) - not affected
> aha(4) - unknown
> ahb(4) - unknown
> ahc(4) - affected
> ahd(4) - unknown; no one answered the OP's question in the thread
> asr(4) - unknown
> ips(4) - unknown
> mpt(4) - not affected
> mfi(4) - unknown
> sym(4) - unknown
>
> Could the problem be specific to certain firmware revisions on the
> cards?

no, I tried different card versions

AHD has the same problem
AHC also
AAC also
MPT as well

this is true for AM2 MBs

but not true S939 and S940 MBs



-- 

João







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