F10: something broken with lvm

[Gerry Reno]

Chuck Anderson wrote:
> On Thu, Apr 30, 2009 at 02:55:56PM -0400, Gerry Reno wrote:
>   
>> This is till causing major headaches.
>> Once a system has had its device names changed to /dev/dm-N style then  
>> how are we supposed to know when there is a conflict with device  
>> mounting.  /proc/mounts will show our LVM mounting by it's normal LVM  
>> names such as /dev/mapper/VolGroup01-LogVol00 but 'blkid' will have no  
>> listing for this device under that name any longer.  It will have  
>> /dev/dm-N entries.  But how are we to correlate these devices?  If our  
>> scripts attempt to mount /dev/dm-1 because it has no mount showing under  
>> /proc/mounts the script gets an error because the same device is mounted  
>> as /dev/mapper/VolGroup01-LogVol00.  How are we to tell that these  
>> devices have the same UUID when 'blkid' only lists one of them?
>>     
>
> Compare the device major/minor numbers.
>
>   
Yeah, we can do that. That's really low level. I'll just be glad when 
these /dev/dm-N devices are removed from user space. They have broken a 
lot of stuff.

Regards,
Gerry