[clug] achieving persistent device (disk) names

[Kim Holburn]

I was talking to Michael about this before and I mentioned using  
labels in fstab.  Does anyone know how to read and write partitions  
labels?



Here is an example from a redhat system:

# more /etc/fstab
LABEL=/        /               ext3    defaults        1 1
LABEL=/boot    /boot           ext3    defaults        1 2
LABEL=/boot2   /boot2          ext3    defaults        1 2
LABEL=/usr     /usr            ext3    defaults        1 2
LABEL=/var     /var            ext3    defaults        1 2
none            /dev/pts        devpts  gid=5,mode=620  0 0
none            /proc           proc    defaults        0 0
none            /dev/shm        tmpfs   defaults        0 0
/dev/cdrom      /mnt/cdrom      udf,iso9660 noauto,owner,kudzu,ro 0 0
/dev/cdrom1     /mnt/cdrom1     udf,iso9660 noauto,owner,kudzu,ro 0 0
/dev/fd0        /mnt/floppy     auto    noauto,owner,kudzu 0 0
/dev/hde        /mnt/floppy1    auto    noauto,owner,kudzu 0 0

On 2005 Dec 14, at 4:38 PM, Michael James wrote:

> As the names  /dev/sda,  sdb,  sdc, etc are allocated,
>  the system disk keeps getting pushed to the end of the list.
>
> This is a pain as I have to boot a rescue system
>  and edit  /etc/fstab and /boot/grub/menu.1st
>
> I'd like to offer the system some hints
>  so it will always find it's system disk.
> The data disks can be fixed up later.
>
> Is udev the way to do this?
>
> If it is, what udev rules will ensure a particular SYSFS disk
>  ALWAYS comes out as /dev/sda?
>
> Or if asking for  "sda"  is unwise, (it will probably already exist)
>  is there a convention?  Something like  "/dev/root"  or  "/dev/ 
> system"?
>
> I tried this in  "/etc/udev/udev.rules"  but nothing happened.
> BUS="scsi", SYSFS{model}="PERCRAID Mirror ", NAME="root"
>
> TIA,
> michaelj
> -- 
> Konqueror has gotten so clever for its own boots
>   that it has forgotten what a web browser is for.
> -- 
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Kim Holburn
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