udev device naming

[Sannu K]

On Thu, Nov 29, 2012 at 11:43 AM, Mulyadi Santosa
<mulyadi.santosa at gmail.com> wrote:
> Hi...
>
> On Thu, Nov 29, 2012 at 9:04 AM, Prasad Joshi <prasadjoshi124 at gmail.com> wrote:
>> Hello All,
>>
>> I have a virtual machine to which I dynamically attach/detach disk
>> devices. On this VM the boot device is always '/dev/sda'.
>>
>> When a attach and detach different disk continuously to this virtual
>> machine, every-time, the same device file '/deb/sdb' is created. Is
>> there anyway I can tell udev subsystem to not to reuse the previously
>> used device names?
>
> IMHO that's understandable since the guest think the same disk is
> reinserted back.
>
> So, the key here is to use your virtual machine somehow to pass
> information to the guest that this is another disk.
>
> What virtual machine do you use anyway?
>
> --
> regards,
>
> Mulyadi Santosa
> Freelance Linux trainer and consultant
>
> blog: the-hydra.blogspot.com
> training: mulyaditraining.blogspot.com
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

You can use udev rules to create device node. If a device has serial
number "VMDISK123" then it is possible to give the device name
/dev/VMDISK123. Similarly if you use device serial number it will be
possible to create unique devices. Note: I am not sure whether it is
possible inside a VM.

Regards,
Sannu K