Comment 41 for bug 290153

I have very similar problem with Intrepid on Dell PowerEdge 1550 with 2 SCSI disks
with RAID1 and LVM. /boot partition is also mirrored, but without LVM. After booting
kernel 2.6.27-7-generic I can see the following error message:

ALERT! /dev/mapper/horus-root does not exist, Dropping to the shell!

Fortunately workaround with rootdelay=90 works for me. Thanks for that!

Below is lspci output of my server:

00:00.0 Host bridge: Broadcom CNB20HE Host Bridge (rev 23)
00:00.1 Host bridge: Broadcom CNB20HE Host Bridge (rev 01)
00:00.2 Host bridge: Broadcom CNB20HE Host Bridge (rev 01)
00:00.3 Host bridge: Broadcom CNB20HE Host Bridge (rev 01)
00:01.0 Ethernet controller: Intel Corporation 82557/8/9/0/1 Ethernet Pro 100 (rev 08)
00:02.0 Ethernet controller: Intel Corporation 82557/8/9/0/1 Ethernet Pro 100 (rev 08)
00:03.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev 27)
00:0f.0 ISA bridge: Broadcom OSB4 South Bridge (rev 50)
00:0f.1 IDE interface: Broadcom OSB4 IDE Controller
00:0f.2 USB Controller: Broadcom OSB4/CSB5 OHCI USB Controller (rev 04)
02:05.0 SCSI storage controller: Adaptec AIC-7899P U160/m (rev 01)
02:05.1 SCSI storage controller: Adaptec AIC-7899P U160/m (rev 01)

And here is more details about my system setup:

ptecza@horus:~$ sudo pvscan
  PV /dev/sda2 VG horus lvm2 [9,31 GB / 0 free]
  Total: 1 [9,31 GB] / in use: 1 [9,31 GB] / in no VG: 0 [0 ]

ptecza@horus:~$ sudo vgscan
  Reading all physical volumes. This may take a while...
  Found volume group "horus" using metadata type lvm2

ptecza@horus:~$ sudo lvscan
  ACTIVE '/dev/horus/swap' [1,00 GB] inherit
  ACTIVE '/dev/horus/root' [8,31 GB] inherit

ptecza@horus:~$ cat /proc/partitions
major minor #blocks name

   8 0 17921843 sda
   8 1 248976 sda1
   8 2 17671500 sda2
 254 0 1048576 dm-0
 254 1 8716288 dm-1