Re: 1.1.0rc2: device-mapper: remove ioctl failed: Device or resource busy

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Peter Rajnoha wrote:
> Maybe some important notes and problems we already know about and track:
>  
>  - these rules change the layout in /dev a little:
>      - the nodes are created in /dev directly with the name of dm-X
>        (this is internal kernel name that is not the same as actual DM name)

Is this really necessary? I tried to find out what the motivation is for
that, and I came across a posting from you where you state:
  "The reason for doing so is that creating nodes root /dev directory is
considered to be the "standard way"."

I'm currently on Ubuntu 9.04 and I don't have any /dev/dm-* devices,
only /dev/mapper/* (eg. "raid5-root"), which have much more meaning for
humans. The system works, so there seems to be no actual need for
/dev/dm-* devices.

Maybe it's time to loosen the "standard way". I have the strong feeling
that we're going backwards with respect to usability if eg. df reports
meaningless /dev/dm-* names, so the human has to look up what this
actually means.

Yours, Uwe

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