[8335] in linux-scsi channel archive
Re: Problem
daemon@ATHENA.MIT.EDU (Matthew Jacob)
Thu Mar 9 12:02:44 2000
Date: Thu, 9 Mar 2000 08:35:41 -0800 (PST)
From: Matthew Jacob <mjacob@feral.com>
Reply-To: mjacob@feral.com
To: Eric Youngdale <eric@andante.org>
Cc: sjbuller@us.ibm.com, Eric Lee Green <eric@estinc.com>,
linux-scsi@vger.rutgers.edu
In-Reply-To: <007601bf89e2$c7ee9860$4d0310ac@fairfax.datafocus.com>
Message-ID: <Pine.BSF.4.10.10003090831290.29280-100000@beppo.feral.com>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
> But worth mentioning - I can fix this the next time I am in the code,
> and we won't have to worry about it any longer. No point in allowing these
> silly little things to stand in the way of progress.
Can you do this before 3.4, please?
>
> > In terms of adding extra devs- this is a quantity only pertinent
> > for allocating extra space for loadable HBA rescans- this doesn't have
> > anything to do with boot time probing with static linking, or if it does,
> you
> > can always change the SD_EXTRA_DEVS to something reasonable (like 512).
>
> We still have an effective limit of 128 disks. 8 majors * 16
> disks/major.
>
> Now that devfs is in, I am wondering whether it would make sense to
> allow the disk driver to dynamically allocate as many majors as it needs
> above and beyond the 8 majors. All of the hardcoded assumptions about major
> numbers should be gone from ll_rw_blk.c. In there would be the nasty problem
> of somehow getting the /dev tree - with devfs, that becomes a non-issue as
> the /dev entries are automatically created.
[ he hops up and down chanting yes yes yes yes ! !!! ]
>
> There is still a limit of 256 majors * 16 disks/major or 4096 disks (an
> over-estimate as some majors are unavailable). We won't worry about that
> for now... :-).
>
Well, maybe we should. It's not so much that 4096 is large, very soon it won't
be with a fabric- it's whether or not the lack of anything larger will force a
fabric midlayer to have to do a pick-n-choose policy for binding disks to ids.
-matt
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