Re: udev causing data loss?

[Florian Kulzer <florian.kulzer+debian@icfo.es>]

On Fri, Nov 14, 2008 at 18:42:54 -0700, ghe wrote:
> Florian Kulzer wrote:
> > On Fri, Nov 14, 2008 at 05:01:26 -0700, ghe wrote:
> > 
> > [...]
> > 
> >> particularly hated; massive nuisance causing data loss and grief:
> >>
> >> 	UDEV!!! (not the idea; the implementation)
> > 
> > How does udev cause data loss?
> > 
> 
> I was working on a system where sda is the system disk, and sdb was to
> get a new partition map; powered down for something; connected an
> external USB disk; rebooted; partitioned sdb...
> 
> The names of internal disks change without notice. This, IMHO, is an
> extremely lame idea. I know better now, but it was an expensive lesson.

If that is your only example, then you should change your vote to:

| particularly hated; massive nuisance causing data loss and grief:
|       the modern Linux kernel!!! (asynchronous device discovery)

Here is a simple test to demonstrate that udev takes over the name that
the kernel chooses:

$ udevadm test $(udevadm info --query=path --name /dev/sda) | grep get_name
udev_rules_get_name: add symlink 'disk/by-path/pci-0000:00:1f.2-scsi-0:0:0:0'
udev_rules_get_name: no node name set, will use kernel name 'sda'

(This example is for Lenny and Sid, on Etch you have to replace "udevadm
 test" with "udevtest" and "udevadm info" with "udevinfo".)

-- 
Regards,            | http://users.icfo.es/Florian.Kulzer
          Florian   |