The modules file is for the user to manually add modules. Packages add them via their hook script. The dmraid hook script currently adds dm-mod and dm-mirror, but I believe the kernel has changed and now the correct modules are dm-raid and dm-mirror. Can you try editing your dmraid hook script and changing the force_load dm-mod line to dm-raid and see if that fixes it?
The modules file is for the user to manually add modules. Packages add them via their hook script. The dmraid hook script currently adds dm-mod and dm-mirror, but I believe the kernel has changed and now the correct modules are dm-raid and dm-mirror. Can you try editing your dmraid hook script and changing the force_load dm-mod line to dm-raid and see if that fixes it?