[3672] in linux-scsi channel archive
FW: PCI changes -- SCSI reordering question
daemon@ATHENA.MIT.EDU (Brian Schau)
Fri Apr 10 06:56:29 1998
From: Brian Schau <bsc@fleggaard.dk>
To: "'linux-scsi@vger.rutgers.edu'" <linux-scsi@vger.rutgers.edu>,
"'linux-kernel@vger.rutgers.edu'" <linux-kernel@vger.rutgers.edu>,
"'jlewis@inorganic5.fdt.net'" <jlewis@inorganic5.fdt.net>,
"'drew@colorado.edu'" <drew@colorado.edu>
Date: Fri, 10 Apr 1998 12:51:32 +0200
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Hi,
I have been in exactly the same situation as the two gentlemen below.
I (and my colleagues at Fleggaard) tried to add an extern disk-array to
an onboard controller (aic7xxx) in a machine which had to boot on
devices connected to a DPT card .... (that was a long sentence!).
A look into linux/drivers/scsi/hosts.c reveals that the scsi-codes tries
to register the hosts in a strict order. Too bad for us ...
eata_dma (DPT) is detected after the aic7xxx --- bye, bye root disk!
Solution: Apply the attached hack/patch. It patches cleanly
against 2.0.33.
How to patch:
1) cd /into/dir/where/linux/is/stored
# ie. if the path to your linux-source tree is /usr/src/linux,
you should cd into /usr/src
2) copy the osd_patch.diff.gz into this 'base-linux-source'
directory
3) gunzip osd_patch.diff.gz
4) patch -p0 < osd_patch.diff
5) now recompile your kernel (2.0.33) as usual
What files have been touched?
1) linux/init/main.c (a couple of lines)
2) linux/drivers/scsi/hosts.c (a lot of lines)
3) linux/drivers/scsi/hosts.h (a couple of lines)
4) linux/drivers/scsi/scsi_syms.c (a couple of lines)
What will it give you?
You can now specify the 'scsi_order' option in lilo:
append = "scsi_order=eata_dma,aic7xxx"
The 'scsi_order' tells the kernel the order it should register the
hosts. This should guarantee that disks on 'eata_dma' at any time
will be named /dev/sdaX, and that disks on 'aic7xxx' will be named
/dev/sdbX.
Other examples.
Consider the following setup. (in the following, 'advansys-card' is a
card driven by the advansys-driver. Likewise for 'aic7xxx-card' and
'eata_dma-card'). A server is equipped with three scsi-cards:
1) Advansys-card. Attached: Flatbed-scanner.
2) Aic7xxx-card. Attached: Nothing.
3) Eata_dma-card. Attached: Bootdisk.
The boot disk is on the eata_dma card. Under normal circumstances
the eata_dma-card will be detected last (list order is advansys,
aic7xxx, eata_dma). Here it doesn't matter as there are no disks on
the other cards. Now add a disk to the aic7xxx-card:
1) Advansys-card. Attached: Flatbed-scanner.
2) Aic7xxx-card. Attached: Disk.
3) Eata_dma-card. Attached: Bootdisk.
Kaboom?!?! The aic7xxx-card is detected before the eata_dma-card.
Normally this would mean "Bye, bye, root/boot disk!". Write one of
these in lilo.conf:
1) append = "scsi_order=eata_dma,aic7xxx,advansys"
2) append = "scsi_order=eata_dma,advansys,aic7xxx"
3) append = "scsi_order=eata_dma,aic7xxx"
4) append = "scsi_order=eata_dma,advansys"
5) append = "scsi_order=eata_dma"
If the kernel is compiled with, say, support for 3 scsi-cards, and
they're not all listed as argument to the 'scsi_order' option, the
detection-order will be:
1) cards listed as arguments to the 'scsi_order' option
2) the rest, from the start of the 'builtin' scsi-list
What cards can be specified & what are their names?
Have a look at linux/drivers/scsi/hosts.c (2.0.33, line 222). This is
the 'builtin' list. It starts like this:
scsi_list builtin_scsi_hosts[] =
{
#ifdef CONFIG_AMIGA
#ifdef CONFIG_A3000_SCSI
{ "a3000", 0,
A3000_SCSI },
#endif
...
First entry ("a3000") is the name of the card. This is also the name
you should supply to 'scsi_order'. Scroll down to line 332
("eata_dma") or line 352 ("ppa") --- you get the idea.
What platforms have the patch been tested on?
Linux-i586 (Suse 5.0): eata_dma & aic7xxx NO_SMP!
Linux-i686 (Unifix 2.0): eata_dma & aic7xxx SMP!
... both platforms runs 2.0.33.
Todo.
1) It would be nice if the patch went into the kernel source
tree ( :o).
2) It would be nice if the Scsi_Host_Template were extended
with the following two fields:
char scsi_name[40];
int position;
# (this would place the responsibility of naming the cards
at the developers of these cards. 'builtin_scsi_hosts[]' would then
look as in the older days ...)
Last words.
I don't think/hope this is considered a 'final' solution. The only
'right' thing to do, is to implement what is described below (HP-UX &
Solaris works this way --- why shouldn't linux?). But until then,
I think my solution will keep the crowd happy?
Thank you for your time & have a nice easter-holiday! (... I will!)
Sincerely,
Brian Schau
> -----Original Message-----
> From: Jon Lewis [SMTP:jlewis@inorganic5.fdt.net]
> Sent: Friday, April 10, 1998 6:18 AM
> To: Manuel J. Galan
> Cc: Linux Kernel List
> Subject: Re: PCI changes -- SCSI reordering question
>
> On Thu, 9 Apr 1998, Manuel J. Galan wrote:
>
> > New SCSI reordering can be a real mess, I was lucky not having
> > disks on second adapter, else sde -> sda, sda -> sdb, etc.
> > Nice cycle ;-), mad /etc/fstab, and panic on boot.
>
> I've not kept up with the talk on devfs...but has it been considered
> that
> a naming scheme sort of like the following be used?
>
> /dev/scsi/ncr53c8xx/0/d0l0s0
>
> i.e. controler / number / id lun partition
> type within
> type
>
> That would remove the ambiguity of having a controller0, controller1,
> etc...since SCSI host probing order can change, but the driver name is
> less likely to, and you wouldn't have to worry about device names
> changing
> just because you add a device or controller.
>
> Adding 2 disks to separate controllers on a 2.0.x system that already
> had
> several disks on each, I managed to really confuse myself.
>
> ------------------------------------------------------------------
> Jon Lewis <jlewis@fdt.net> | http://noagent.com/?jl1 for cheap
> Network Administrator | life insurance over the net.
> Florida Digital Turnpike |
> ______http://inorganic5.fdt.net/~jlewis/pgp for PGP public key____
>
>
> -
> To unsubscribe from this list: send the line "unsubscribe
> linux-kernel" in
> the body of a message to majordomo@vger.rutgers.edu
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