Re: /dev/disk/by-label/* not populated by initrd

[Greg KH <greg@kroah.com>]

On Wed, May 17, 2006 at 04:58:20PM +0200, Jens Dreger wrote:
> Hi!
> 
> A few days ago I installed debian/testing amd64 on one of our servers
> to test some 64bit stuff. Upon bootup the machine loaded the SAN
> modules (qla*) before the modules for the system disk, so it didn't
> make it. I could fix this by blacklisting the modules.
> 
> After reading up on udev I understood that I am supposed to write
> some rules which make sure the system disks get's a persistent
> name. So I gave the disk a label and udevtest shows that it would be
> assigned:
> 
>   root@zs11:~> udevtest /block/sda/sda1 | grep label
>   udev_rules_get_name: add symlink 'disk/by-label/zs11_system'
>   create_node: creating symlink '/dev/disk/by-label/zs11_system' to '../../sda1'
> 
> The problem is that this does not work inside initrd, but I obviously
> need that link for the rootfs. I unpacked the initrd and init has
> support for this:
> 
>   root@zs11:/boot/initrd.img-2.6.15-1-amd64-generic.unpack> grep LABEL init
>                 LABEL=*)
>                         ROOT="/dev/disk/by-label/${ROOT#LABEL=}"
> 
> Booting with kernel-commandline root=LABEL=zs11_system didn't work.
> 
> I copied udevtest to the initrd. It shows:
> 
> [...]
> main: looking at device '/block/sda/sda1' from subsystem 'block'
> udev_rules_get_name: no node name set, will use kernel name 'sda1'
> lookup_group: specified group unknown 'disk'
> create_node: creating device node '/dev/sda1', major = '8', minor = '1', mode = '0660', uid = '0', gid = '0' 
> main: run: 'socket:/org/kernel/udev/monitor'
> [...]
> 
> I know that this is probably a debian issue

Yes, it is.

> but I would like to know how to debug this further.

Try putting the rules and helper scripts that create the by-label/
symlinks into the initrd so that udev can create them.

good luck,

greg k-h


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