SCSI Drives / Large Memory Kernel Panic

[Shawn Badger]

I wonder then if the SCSI card that doesn't work has a fixed IO address that
happens to fall within a memory address above 2 gig and you start having
problems when ever that space is touched. I am just totally shooting in the
dark, but it may be just that.

On 7/16/07, Steven Wagner <digital9ja at gmail.com> wrote:
>
> Shawn Badger wrote:
> > I am guessing it may be some bad memory. I know that CentSO can
> > support much more than 4 Gig of memory. Get something like the system
> > rescue cd and do a memory test to see if it makes it through.
> >
> > Also, remove the old 2 gig of memory and see if it works in that
> > configuration. If it does, then you may even try to mix and match the
> > chips. It is possible they sent you the wrong memory.
> When we install CentOS to a SATA drive everything works fine and it sees
> all 4 GB RAM and there aren't any problems. I think it's the SCSI card.
> The card in the broken server is an Adaptec 2940W/2940UW. I found out
> tonight that this same client has another server with us that is running
> CentOS with 4 GB RAM, but the SCSI card in that system is an Adaptec
> 2940UW. hmmmm... I asked her if she could afford the downtime (15-20
> minutes) for me to borrow that card and swap with the one in the broken
> server. I'm still waiting to hear back on that.
>
> At this point I am 98.9% sure it's something to do with the SCSI card.
> Still, it's kind of weird that that card and those drives work perfectly
> with 2 GB RAM, no? Maybe a firmware issue with the drives? Or the card?
> >
> >
> >
> > On 7/15/07, *Steven Wagner* <digital9ja at gmail.com
> > <mailto:digital9ja at gmail.com>> wrote:
> >
> >     Technomage-hawke wrote:
> >     > this may be a linux specific problem (I cannot be sure unless
> >     the results can
> >     > be duplicated with other linux distros).
> >     >
> >     > perhaps trying openBSD or OpenSolaris would work (fully
> >     supported for that
> >     > much ram and that hardware).
> >     >
> >     I've tried FreeBSD (and several other Linux distros) and it didn't
> >     even
> >     see the drives. I'm pretty sure that the problem is the card, but
> it's
> >     still odd that it works fine with 2 GB RAM. Also, CentOS worked fine
> >     with the SATA drive and all 4 GB RAM.
> >     >
> >     >
> >     > TMH
> >     >
> >     > On Sunday 15 July 2007 21:57, Steven Wagner wrote:
> >     >
> >     >> I'm trying to upgrade a server from 2 GB of registered ECC RAM
> >     to 4 GB.
> >     >> The extra RAM was specifically purchased from the manufacturer
> >     to be
> >     >> identical to the existing modules. After installing the extra
> >     RAM the
> >     >> server panic'ed so we tried installing some other kernels, even
> >     enabling
> >     >> huge mem (64 bit) to no avail.
> >     >>
> >     >> I rebuilt the server with CentOS 4.4 Server CD with all 4 GB of
> RAM
> >     >> installed. It panics when I try to boot with the full 4 GB
> >     installed,
> >     >> but boots fine when I remove 2 GB.
> >     >>
> >     >> The panic seems to happen when the SCSI card driver, aic7xxx,
> >     tries to
> >     >> enable the disc drives. The console error says:
> >     >>
> >     >> aic7xxx_dump returns 0x2002
> >     >> Device offlined
> >     >>
> >     >> then a slew of SCSI I/O errors, the exec of init failed, then
> >     the panic.
> >     >> It seems weird that the card and the drives work fine with the
> >     2 GB of
> >     >> RAM...Anybody have any thoughts?
> >     >>
> >     >> TIA,
> >     >>
> >     >> Steve
> >     >>
> >     >> BTW, I installed CentOS 4.4 on this machine to a SATA drive and
> >     it sees
> >     >> all 4 GBs and works fine.
> >     >> ---------------------------------------------------
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