This is a re-emergence of bug #3040 (closed) as reported here: https://bugs.alpinelinux.org/issues/3040

Tested on versions 3.0.6 and edge (2014-11-21).

The problem only occurs when installing on a server with HP-Compaq hardware RAID controller.

The installation goes through without any problems until at the end:

==> initramfs: creating /boot/initramfs-grsec
6927 blocks
/lib/modules/3.14.22-1-grsec/kernel/drivers/block/cpqarray*: No such file or directory. Skipped
31719 blocks
/boot is device /dev/cciss/c0d0p1

After reboot, the usual syslinux countdown screen appears and then:

Mounting root failed. 
initramfs emergency recovery shell launched. Type 'exit' to continue boot
sh:can't access tty; job control turned off

The cpqarray kernel driver module is nowhere to be found on the installation environment.

(from redmine: issue id 3529, created on 2014-11-21)