[gentoo-user] lilo device-mapper & udev

[gentoo-user] lilo device-mapper & udev

[Francesco Talamona]

I was going to add a new entry in lilo boot:

aemaeth ~ # lilo -v
LILO version 22.7, Copyright (C) 1992-1998 Werner Almesberger
Development beyond version 21 Copyright (C) 1999-2005 John Coffman
Released 12-Apr-2005 and compiled at 10:36:57 on Jan  3 2006

Warning: '/proc/partitions' does not match '/dev' directory structure.
    Name change: '/dev/dm-0' -> '/dev/vg/homelv'
    Name change: '/dev/dm-1' -> '/dev/vg/usrlv'
    Name change: '/dev/dm-2' -> '/dev/vg/varlv'
    Name change: '/dev/dm-3' -> '/dev/vg/optlv'
    Name change: '/dev/dm-4' -> '/dev/vg/tmplv'
    Name change: '/dev/dm-5' -> '/dev/vg/bulklv'
    Name change: '/dev/sdd' -> '/dev/sdd'
    Name change: '/dev/sdd1' -> '/dev/sdd1'
Fatal: open /dev/sdd: No such file or directory

sdd{,1,2} belong to a removable device and are listed 
in /proc/partitions but remapped to /dev/mobile%n 
via /etc/udev/rules.d/10-local.rules; /dev/mobile1 is a partition 
encrypted by dm-crypt as /dev/mapper/hidmo.
Lilo encounter this fatal error even before /dev/mapper/hidmo is 
created.
LVM mapping stems just warnings, so this problem has definitely to do 
with cryptography, never had a blocking problem with lilo before.

Lilo fatal error is resolved unplugging the removable device, but i 
guess there's a "software" solution to this "double mapping" issue.
Any comments?

Thanks
	Francesco
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Linux Version 2.6.15-gentoo-r1, Compiled #1 PREEMPT Mon Jan 16 07:58:03 
CET 2006
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Re: [gentoo-user] lilo device-mapper & udev

[Richard Fish]

On 2/4/06, Francesco Talamona <ti.liame@email.it> wrote:
>     Name change: '/dev/sdd' -> '/dev/sdd'
>     Name change: '/dev/sdd1' -> '/dev/sdd1'
> Fatal: open /dev/sdd: No such file or directory
>
> sdd{,1,2} belong to a removable device and are listed
> in /proc/partitions but remapped to /dev/mobile%n
> via /etc/udev/rules.d/10-local.rules;

I've generally found it easier to keep the /dev/sd* names and just
SYMLINK the names I want.  Example:

BUS=="usb", KERNEL=="sd[a-z][0-9]", SYSFS{product}=="Flash Disk",
NAME="%k", SYMLINK="usbkey%n"

-Richard

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[gentoo-user] Re: lilo device-mapper & udev

[Francesco Talamona]

On Sunday 05 February 2006 02:44, Richard Fish wrote:
> On 2/4/06, Francesco Talamona <ti.liame@email.it> wrote:
> >     Name change: '/dev/sdd' -> '/dev/sdd'
> >     Name change: '/dev/sdd1' -> '/dev/sdd1'
> > Fatal: open /dev/sdd: No such file or directory
> >
> > sdd{,1,2} belong to a removable device and are listed
> > in /proc/partitions but remapped to /dev/mobile%n
> > via /etc/udev/rules.d/10-local.rules;
>
> I've generally found it easier to keep the /dev/sd* names and just
> SYMLINK the names I want.  Example:
>
> BUS=="usb", KERNEL=="sd[a-z][0-9]", SYSFS{product}=="Flash Disk",
> NAME="%k", SYMLINK="usbkey%n"

It really is more flexible than my configuration, I'll do some tests 
this evening. Thanks.
	Francesco
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Linux Version 2.6.15-gentoo-r2, Compiled #1 PREEMPT Wed Feb 1 07:51:02 
CET 2006
One 1GHz AMD Athlon 64 Processor, 2GB RAM, 2004.78 Bogomips Total
aemaeth
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Re: [gentoo-user] lilo device-mapper & udev

[Neil Bothwick]

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On Sat, 4 Feb 2006 18:44:20 -0700, Richard Fish wrote:

> I've generally found it easier to keep the /dev/sd* names and just
> SYMLINK the names I want.  Example:
> 
> BUS=="usb", KERNEL=="sd[a-z][0-9]", SYSFS{product}=="Flash Disk",
> NAME="%k", SYMLINK="usbkey%n"

The disadvantage of this is that pmount uses the real device name, not
the symlink, so you still end up with devices mounted on inconsistent
directory names in /media. that's why I prefer to do it the other way
round; NAME="somethingdescriptive", SYMLINK="%k".


-- 
Neil Bothwick

Velilind's Laws of Experimentation:
1. If reproducibility may be a problem, conduct the test only once.
2. If a straight line fit is required, obtain only two data points.

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Re: [gentoo-user] lilo device-mapper & udev

[Richard Fish]

On 2/5/06, Neil Bothwick <neil@digimed.co.uk> wrote:
>
> The disadvantage of this is that pmount uses the real device name, not
> the symlink, so you still end up with devices mounted on inconsistent
> directory names in /media. that's why I prefer to do it the other way
> round; NAME="somethingdescriptive", SYMLINK="%k".

Ah, I hadn't thought of that.  Thanks!

-Richard

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[gentoo-user] Re: lilo device-mapper & udev [SOLVED]

[Francesco Talamona]

On Sunday 05 February 2006 11:27, Neil Bothwick wrote:
> NAME="somethingdescriptive", SYMLINK="%k"

I'm back, in the end that's what I did:

I changed the line 
BUS="scsi",SYSFS{vendor}="vendorname",SYSFS{model}="modelname",NAME="mobile%n"
to:
BUS="scsi",SYSFS{vendor}="vendorname",SYSFS{model}="modelname",NAME="mobile%n",SYMLINK="%k"
in /etc/udev/rules.d/10-local.rules.

Now everything works as expected.

Many many thanks to Richard that pinpointed the culprit and to Neil, 
with his elegant solution.

	Francesco

-- 
Linux Version 2.6.15-gentoo-r2, Compiled #1 PREEMPT Wed Feb 1 07:51:02 
CET 2006
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Re: [gentoo-user] Re: lilo device-mapper & udev [SOLVED]

[Neil Bothwick]

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On Sun, 5 Feb 2006 21:21:15 +0100, Francesco Talamona wrote:

> BUS="scsi",SYSFS{vendor}="vendorname",SYSFS{model}="modelname",NAME="mobile%n",SYMLINK="%k"

That should be

BUS=="scsi",SYSFS{vendor}=="vendorname",SYSFS{model}=="modelname",NAME="mobile%n",SYMLINK="%k"

Tests should use ==. A single = currently works, but is incorrect and may
stop working at some time.


-- 
Neil Bothwick

"Bother" said Rue, when Eeyore called him a sellout

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[gentoo-user] Re: lilo device-mapper & udev [SOLVED]

[Francesco Talamona]

On Sunday 05 February 2006 21:47, Neil Bothwick wrote:
> Tests should use ==. A single = currently works, but is incorrect and
> may stop working at some time.

It makes sense, now it's perfect, thanks.
	Francesco
-- 
Linux Version 2.6.15-gentoo-r2, Compiled #1 PREEMPT Wed Feb 1 07:51:02 
CET 2006
One 1GHz AMD Athlon 64 Processor, 2GB RAM, 2004.78 Bogomips Total
aemaeth
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