Re: [SCSI] SCSI block devices larger then 2TB

[David Lang]

On Mon, 12 Dec 2005, David Lang wrote:

> On Wed, 7 Dec 2005, Christoph Hellwig wrote:
>
> > On Wed, Dec 07, 2005 at 11:21:09AM +0100, Michal Feix wrote:
> > > Greetings!
> > >
> > > Current aic79xxx driver doesn't see SCSI devices larger, then 2TB. It
> > > fails with READ CAPACITY(16) command. As far as I can understand, we
> > > already have LBD support in kernel for some time now. So it's only
> the
> > > drivers, that need to be fixed? LSI driver is the only one I found
> > > working with devices over 2TB; I couldn't test any other driver, as I
> > > don't have the hardware. Is it really so bad, that only LSI chipset
> > and
> > > maybe few others are capable of seeng such devices?
> >
> > I definitly works fine with Qlogic parallel scsi and fibrechannel and
> > emulex
> > fibre channel controllers aswell as lsi/engenio megaraid controllers.
> >
> > It looks like aci79xx is just broken in that repsect. Unfortunately
> the
> > driver doesn't have a proper maintainer, we scsi developers put in
> fixes
> > and cleanups but we don't have the full documentation to fix such
> > complicated
> > issue.  If you have a support contract with Adaptec complain to them.
>
> I was at a BOF at LISA last week on this subject, the guy running it
> said
> that the common ultra320 chip used for parallel scsi doesn't implment
> READ
> CAPACITY(16), but instead implemnets a propriatary READ CAPACITY(12)
> which
> allows you to break the 2TB limit.
>
> I asked him to send the patch that he's been maintaining seperatly (and
> providing to his customers, he's a storage hardware vendor) to the list
> to
> get integrated.
>
> I'll see if I have any notes with his address on them, or you could
> check
> the BOF schedule online to see if it got listed there.

here is the BOF listing, hopefully someone will recongnise the names and 
be able to contact them directly

Large Filesystems: Breaking 2TB Limitation
Organizer: Sergey Sviridov, AC&NC
Wednesday, December 7, 9:00 p.m.10:00 p.m., Hampton

How to address more than 2TB Storage Volume as a single LUN. Windows and 
Linux experience. Doug Hughes will talk about Solaris and Veritas Volume 
Manager.

David Lang
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