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Old 03-13-2006, 10:48 PM   #1
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Registered: Dec 2004
Posts: 13

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trying to install/boot 2.6.15 kernel - device mapper error

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 recognize it? 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.

Old 03-14-2006, 04:41 AM   #2
Senior Member
Registered: Sep 2003
Location: The Netherlands
Distribution: Gentoo (main); SuSE 9.3 (fallback)
Posts: 1,607

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Probably the reason you couldn't find it is that it's a sub-entry (requires a specific parent to be enabled before it becomes chooseable).

The setting you're looking for is:

Device Drivers=> Multi-device support (RAID and LVM) (this must be selected)=> Device mapper support.

If you choose to make device mapper support a module rather than statically compiled ("M" instead of "*", don't forget to make sure that the module (dm-mod) is loading properly during the course of boot.

Hope this helps.
Old 03-15-2006, 10:49 PM   #3
LQ Newbie
Registered: Dec 2004
Posts: 13

Original Poster
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one more newbie question

How do you make sure that the dm-mod is loading properly during the boot? I tried recompiling everything use make oldconfig. Device mapper is enabled as M, but I still get the same error message.



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