[7424] in linux-scsi channel archive
Re: Devices limit
daemon@ATHENA.MIT.EDU (catfish@alltel.net)
Tue Oct 26 17:03:40 1999
Date: Tue, 26 Oct 1999 15:24:29 -0500 (CDT)
From: <catfish@alltel.net>
To: irish@n2h2.com
cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <19991026.19302900@ballista.bess.net>
Message-ID: <Pine.LNX.4.04.9910261523290.645-100000@jesse.crash.net>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
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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