Re: [dm-devel] device mapper error when attempting to install 2nd kernel on CentOS

[Brad Dameron <brad seatab com>]

On Tue, 2006-03-14 at 01:29 -0800, Michael Phoenix wrote:
> I am having trouble trying to install version 2.6.15 of the linux
> kernel onto a machine that is currently running 2.6.9 version of the
> kernel. I am using the 2.6.9 configuration file and running make
> install successfully. When I try to boot the new kernel, I get the
> following:
> No entry for device mapper found Is device mapper driver missing from kernel?
> Failure to communicate with kernel
> mount: error 19 mounting ext3
> mount: error 2 mounting none
> 
> Apparently the device mapper is being used on the current kernel and
> does exist in the direcotory /sys/misc. What do I need to do to get my
> new kernel to run? According to what I've read, every kernel since
> 2.6.9 should have it in the source.
> I checked the .config file and couldn't find anything called device
> mapper. There was an entry for an IOMAPPER associated with a certain
> scsi device that was commented out, but I have no idea what to put
> after =. I couldn't find a comparable entry using make menuconfig. Any
> help would be greatly appreciated.
> I don't really have any need for it so if I can get my kernel to run
> without it that is an acceptable solution.
> 
> Mike


I had this similar problem. And it wasn't with DM. It was something
strange with using the old config file. I had to create a new config
file with the new kernel.

Brad Dameron
SeaTab Software
www.seatab.com