Booting from dmraid

[fletch.dp]

I have RAID10 assembled on HighPoint RocketRaid, pata_hpt37x module is compiled in kernel, genkernel Initramfs built with --dmraid option, while booting /dev/mapper/hpt45x_gihigibga, /dev/mapper/hpt45x_gihigibga-0, /dev/mapper/hpt45x_gihigibga-1 appears in /dev/mapper. But I can't see this partitions:

/dev/mapper/hpt45x_gihigibga1
/dev/mapper/hpt45x_gihigibga2
/dev/mapper/hpt45x_gihigibga3
/dev/mapper/hpt45x_gihigibga4

And so boot process fails with "is not a valid root device"

While booting from livecd after running dmraid -ay -vv I can see hpt45x_gihigibga, hpt45x_gihigibga-0, hpt45x_gihigibga-1 in /dev/mapper, only after kpartx -a /dev/mapper/hpt45x_gihigibga, i can see my partitons in /dev/mapper. I have this in grub.conf: real_root=UUID=[some-long-uuid] dodmraid. How can I run kpartx after dmraid is loaded by initramfs, cause without kpartx boot is failing? kpartx binary is included in initramfs, if I read correctly gen_initramfs.sh build script.

[dambacher]

the initramfs will run kpartx if you add "domultipath" to your kernel command line.