LVM2 library incompatibility?

**Rubick** · 12-18-2004

I'm using slackware current/2.6.9 kernel, and I'm trying to merge two disks into one using lvm2. I was able to create pv's and vg. When I issue the command to create a logical volume, I get a libdevmapper incompatibility error, and I can't go any farther.
device mapper is compiled into the kernel. Here is the output of lvdisplay after I issued lvcreate.

Code:

/dev/mapper/control&#58; open failed&#58; No such device or address
  Is device-mapper driver missing from kernel?
  /dev/mapper/control&#58; open failed&#58; No such device or address
  Is device-mapper driver missing from kernel?
  Incompatible libdevmapper 1.00.17-ioctl &#40;2004-04-19&#41;&#40;compat&#41; and kernel driver 
  --- Logical volume ---
  LV Name                /dev/vg0/lv0
  VG Name                vg0
  LV UUID                Z0NTuu-5H67-aP8M-aNVn-67G0-ph2G-YeJypU
  LV Write Access        read/write
  LV Status              NOT available
  LV Size                26.64 GB
  Current LE             6821
  Segments               2
  Allocation             next free &#40;default&#41;
  Read ahead sectors     0

Any thoughts?
How do I mkreiserfs on this logical volume? there appears to be no /dev/vg0/lv0

**Rubick** · 12-19-2004

I fixed it myself.

It seems the FAQ on the first howto I was reading gave this command.

Code:

# mknod /dev/mapper/control c 63 $number

I found out later that I was looking at an 'unofficial' lvm howto.
The real LVM howto tells you to issue this command

Code:

# mknod /dev/mapper/control c 10 $number

Which worked. I had to issue an lvremove and recreate my logical volume in order to get the proper /dev/volume_group/logical_volume device.

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LVM2 library incompatibility?

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