[4777] in linux-scsi channel archive
Re: disks and file size
daemon@ATHENA.MIT.EDU (Jakub Jelinek)
Thu Oct 1 12:55:49 1998
From: Jakub Jelinek <jj@sunsite.ms.mff.cuni.cz>
To: hwb@nlanr.net (Hans-Werner Braun)
Date: Thu, 1 Oct 1998 18:11:51 +0200 (MET DST)
Cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <19981001082709.50495@nlanr.net> from "Hans-Werner Braun" at Oct 1, 98 08:27:09 am
>
> I looked around for documentation, but could not find answers to the
> following questions. May be you can help me? I am using 2.0.35 in a new
> Debian release.
>
> 1. I have a machine with 18 SCSI hard drives. The boot process finds
> them, but I cannot use them beyond sdp (which is documented), i.e.,
> when it runs out of the 16 disks times 16 paritions minor numbers. Is
> there some workaround for me to see all disks?
Yes. Get linux-2.1.122-ac2 or any other 2.1 kernel with my and Jirka
Hanika's patch allowing up to 128 SCSI disks (or find it in some
linux-kernel conference archive).
There is no such patch for 2.0 and probably won't ever be.
>
> 2. The documentation I found gives no indication to file size limits,
> but it seems that I can only create files up to 2GB. Is that so, or am
> I doing something wrong?
Yes, you are doing something wrong. You're using bad architecture :)
If you switch to UltraSPARC or Alpha, you can create much larger files.
There are some people who want to look at that issue for 2.3, but there are
several problems with support for large files on 32bit platforms, especially
page cache and kernel interface problems. And it is not the best solution to
slow down all 32bit platforms by using long long internaly just about
everywhere when most of the files don't need that.
Cheers,
Jakub
___________________________________________________________________
Jakub Jelinek | jj@sunsite.mff.cuni.cz | http://sunsite.mff.cuni.cz
Administrator of SunSITE Czech Republic, MFF, Charles University
___________________________________________________________________
Ultralinux - first 64bit OS to take full power of the UltraSparc
Linux version 2.1.121 on a sparc64 machine (498.80 BogoMips).
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