Странное поведение при загрузке

Я установил Arch Linux на серверную машину с аппаратным RAID 5 LSI.

Когда машина загружается, она говорит:

:: Triggering uevents...
udevd[37]: worker [41] timeout, kill it

udevd[37]: seq 547 '/devices/pci0000:00/0000:00:1e.0/0000:01:07.0' killed

Waiting 10 seconds for device /dev/sda1 ...
udevd[37]: worker [41] terminated by signal 9 (Killed)

ERROR: device '/dev/sda1' not found. Skipping fsck.
ERROR: Unable to find root device '/dev/sda1'.
You are being dropped to a recovery shell
    Type 'exit' to try and continue booting.


[   41.896810] sd 4:1:0:0: [sda] Asking for cache data failed
[   41.896877] sd 4:1:0:0: [sda] Assuming drive cache: write through
[   41.897474] sd 4:1:0:0: [sda] Asking for cache data failed
[   41.897543] sd 4:1:0:0: [sda] Assuming drive cache: write through
[   41.922993] sd 4:1:0:0: [sda] Asking for cache data failed
[   41.923048] sd 4:1:0:0: [sda] Assuming drive cache: write through

[rootfs /]#

Теперь, если я наберу «выход», я получаю следующее сообщение:

Trying to continue (this will most likely fail) ...
:: mounting '/dev/sda1' on real root
:: running cleanup hook [udev]
INIT: version 2.88 booting

[and so on]

... и машина прекрасно загружается.

Что здесь не так?