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Old 05-15-2011, 09:24 PM   #1
yuanbor
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Registered: May 2008
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Why I cann't find the device created through device mapper in /proc/partitions


Hi all,
Recently, I created a device sc0 through device mapper. The divice could be found in /dev/mapper/sc0. My problem is that the device doesn't exist in /dev/partitions which will block my following test.
BTW, I found dm-0 in /dev/partitions. Is it the same as /dev/mapper/sc0? But the device /dev/dm-0 doesn't exist!
 
Old 05-15-2011, 11:51 PM   #2
gilead
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On my system, /dev/mapper contains symlinks to devices (/dev/dm-0, etc.). It's the actual devices that appear in /proc/partitions, not the symlinks. Can your test look up the symlink in /dev/mapper first and see what it is linked to?
 
Old 05-16-2011, 01:32 AM   #3
yuanbor
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Quote:
Originally Posted by gilead View Post
On my system, /dev/mapper contains symlinks to devices (/dev/dm-0, etc.). It's the actual devices that appear in /proc/partitions, not the symlinks. Can your test look up the symlink in /dev/mapper first and see what it is linked to?
[root@localhost scripts]# cat /proc/partitions
major minor #blocks name

8 0 117220824 sda
8 1 104391 sda1
8 2 117113850 sda2
8 16 117220824 sdb
8 17 7823623 sdb1
8 18 15631245 sdb2
253 0 15631245 dm-0

[root@localhost scripts]# ll /dev/mapper/
total 0
crw------- 1 root root 10, 63 May 16 14:29 control
brw-rw---- 1 root disk 253, 0 May 16 14:33 sc0
 
  


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