Re: 64-bit kdev_t - just for playing

From: Joel Becker (Joel.Becker@oracle.com)
Date: Mon Mar 31 2003 - 18:55:44 EST


On Mon, Mar 31, 2003 at 03:41:50PM -0800, Badari Pulavarty wrote:
> I have been playing with supporting 4000 disks on IA32 machines.
> There are bunch of issues we need to resolve before we could
> do that.

        That's the conversation I'm trying to kickstart.

> I am using scsi_debug to simulate 4000 disks. (Ofcourse, I had
> to hack "sd" to support more than 256 disks). Anyway, I noticed
> that I lost almost 350MB of my lowmem, when I simulated 4000 disks.
> We are working on most of these. But there are userlevel issues
> to be resolved. Here is the list ...

        Wow, this is cool. Thanks for telling me about this.

> I have not done any IO on these yet. When I mount all of these and do
> IO on them, we might see new issues. So with all these, I will be doubtful
> if we can ever reach 16k disks on IA32.

        We're going to have to find a way. IA32 is going to be around
for long enough, I think. Easily 8k disks, as soon as the folks who are
doing 4k disks today want to multipath.

Joel

-- 

Life's Little Instruction Book #226

"When someone hugs you, let them be the first to let go."

Joel Becker Senior Member of Technical Staff Oracle Corporation E-mail: joel.becker@oracle.com Phone: (650) 506-8127 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/



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