[dm-devel] how to create /dev/mapper/control?

[Ling, Xiaofeng]

It works. Thanks a lot. 

>-----Original Message-----
>From: Kevin Corry [mailto:kevcorry at us.ibm.com] 
>Sent: 2004年6月25日 20:48
>To: dm-devel at redhat.com
>Cc: Ling, Xiaofeng
>Subject: Re: [dm-devel] how to create /dev/mapper/control?
>
>On Thursday 24 June 2004 4:53 am, Ling, Xiaofeng wrote:
>> I download and install device-mapper,
>> but when I run dmsetup info, it says /dev/mapper/control open failed.
>> So how should I create the device node? what major & minor?
>> I tried 253,0, still fail.
>
>In the device-mapper source package, there's a script called 
>scripts/devmap_mknod.sh that you can run from your boot-scripts to 
>create /dev/mapper/control each time you boot.
>
>In practice, I've always seen /dev/mapper/control with 
>dev-number 10:63. But 
>this isn't guaranteed. The control node is registered with the "misc" 
>character driver, and simply asks for the first available 
>minor number under 
>that driver. This means you need to first grep /proc/devices 
>for "misc" to 
>get the major number, then grep /proc/misc for "device-mapper" 
>to get the 
>minor number. This is basically what the above script does.
>
>-- 
>Kevin Corry
>kevcorry at us.ibm.com
>http://evms.sourceforge.net/
>
>