[7425] in linux-scsi channel archive
Re: Devices limit
daemon@ATHENA.MIT.EDU (irish@n2h2.com)
Tue Oct 26 17:05:11 1999
From: <irish@n2h2.com>
Date: Tue, 26 Oct 1999 21:27:02 GMT
Message-ID: <19991026.21270200@ballista.bess.net>
To: <catfish@alltel.net>
CC: linux-scsi@vger.rutgers.edu
In-Reply-To: <Pine.LNX.4.04.9910261523290.645-100000@jesse.crash.net>
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Argh, I knew I wouldn't be clear :(
I understand the physical limit of SCSI3, what I'd like to do is
create more than 15 logical devices.
Thank you,
Irish
>>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<<
On 10/26/99, 12:24:29 PM, <catfish@alltel.net> wrote regarding Re:
Devices limit:
> Hello,
> SCSI 3 protocol has a limit of 16 the controller being one.
> Scsi 2 was 8 If I remember right.
> It's not a driver issue it's the hardware limit.
> Terry.
> On Tue, 26 Oct 1999 irish@n2h2.com wrote:
> > I've searched for this information in several places, but was unable
> > to find a satisfactory answer. If this is in a FAQ somewhere that I've
> > missed, please feel free to redirect me.
> >
> > Why is there a limit of 15 SCSI devices per drive? Can it (will it) be
> > increased ever?
> >
> > The motivation for asking: We are using Sybase, and it has a limit of
> > 2GB on raw devices. When we put together a RAID array larger than 30
> > GB, we will be unable to utilize all the space this way and still have
> > it spread across as many drives as possible (7 in our case). We could
> > format the devices and Sybase then has no limit (it will create 2GB
> > virtual devices on the filesystem), but we then take a performance
> > hit.
> >
> > What we'd like to do is be able to create more than 15 2GB raw devices
> > per array.
> >
> > Thank you for any information you can provide,
> > Irish@N2H2.com
> >
> >
> >
> >
> > -
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> >
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