Grub issues with Fake Raid

[PCFascist]

I've followed this howto:
https://help.ubuntu.com/community/FakeRaidHowto

Here is where I run into issues:

root@ubuntu:/# grub --no-curses
Probing devices to guess BIOS drives. This may take a long time.
Unknown partition table signature

[ Minimal BASH-like line editing is supported. For
the first word, TAB lists possible command
completions. Anywhere else TAB lists the possible
completions of a device/filename. ]
grub> device (hd0) /dev/mapper/via_ceedgdabjh2
device (hd0) /dev/mapper/via_ceedgdabjh2
grub> find /boot/grub/stage1
find /boot/grub/stage1
Unknown partition table signature

Error 15: File not found
grub>


I've taken the liberty of running the following troubleshooting script that seems to be asked for in most grub troubleshooting threads...
boot_info_script032:


============================= Boot Info Summary: ==============================

=> No boot loader is installed in the MBR of /dev/sda
=> Grub0.97 is installed in the MBR of /dev/sdb and looks on the same drive
in partition #1 for /boot/grub/stage2 and /boot/grub/menu.lst.

sdb1: __________________________________________________ _______________________

File system:
Boot sector type: Unknown
Boot sector info:
Mounting failed:
mount: unknown filesystem type ''

sdb2: __________________________________________________ _______________________

File system:
Boot sector type: Unknown
Boot sector info:
Mounting failed:
mount: unknown filesystem type ''

sdb3: __________________________________________________ _______________________

File system:
Boot sector type: Unknown
Boot sector info:
Mounting failed:
mount: unknown filesystem type ''

=========================== Drive/Partition Info: =============================

Drive: sda ___________________ __________________________________________________ ___

Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders, total 156301488 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x00000000

Partition Boot Start End Size Id System

Invalid MBR Signature found


Drive: sdb ___________________ __________________________________________________ ___

Disk /dev/sdb: 100.2 GB, 100256292864 bytes
255 heads, 63 sectors/track, 12188 cylinders, total 195813072 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x50e350e3

Partition Boot Start End Size Id System

/dev/sdb1 1,879,605 302,584,274 300,704,670 83 Linux
/dev/sdb2 * 63 1,879,604 1,879,542 83 Linux
/dev/sdb3 302,584,275 312,592,769 10,008,495 82 Linux swap / Solaris

/dev/sdb1 ends after the last sector of /dev/sdb
/dev/sdb3 ends after the last sector of /dev/sdb

blkid -c /dev/null: __________________________________________________ __________

/dev/loop0: TYPE="squashfs"
/dev/mapper/via_ceedgdabjh1: LABEL="/" UUID="2b1e8cb6-3ebc-4a82-a3f2-de5a8aeac4c9" TYPE="ext3"
/dev/mapper/via_ceedgdabjh2: LABEL="/boot" UUID="43e5eeea-f682-4b9a-8cfa-5782d8fcfa82" TYPE="ext3"
/dev/mapper/via_ceedgdabjh3: UUID="7c112c46-96b8-4eb6-87d3-49180a1692c6" TYPE="swap"

=============================== "mount" output: ===============================

proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
tmpfs on /lib/modules/2.6.28-11-generic/volatile type tmpfs (rw,mode=0755)
tmpfs on /lib/modules/2.6.28-11-generic/volatile type tmpfs (rw,mode=0755)
tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
varrun on /var/run type tmpfs (rw,nosuid,mode=0755)
varlock on /var/lock type tmpfs (rw,noexec,nosuid,nodev,mode=1777)
udev on /dev type tmpfs (rw,mode=0755)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)
rootfs on / type rootfs (rw)
/dev/sr0 on /cdrom type iso9660 (ro,noatime)
/dev/loop0 on /rofs type squashfs (ro,noatime)
fusectl on /sys/fs/fuse/connections type fusectl (rw)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
gvfs-fuse-daemon on /home/ubuntu/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=ubuntu)
/dev/mapper/via_ceedgdabjh1 on /target type ext3 (rw)
/dev/mapper/via_ceedgdabjh2 on /target/boot type ext3 (rw)
/dev on /target/dev type none (rw,bind)
proc on /target/proc type proc (rw)
sys on /target/sys type sysfs (rw)

=========================== Unknown MBRs/Boot Sectors/etc =======================

Unknown BootLoader on sdb1


Unknown BootLoader on sdb2


Unknown BootLoader on sdb3



=============================== StdErr Messages: ===============================

hexdump: /dev/sdb1: No such file or directory
hexdump: /dev/sdb1: No such file or directory
hexdump: /dev/sdb2: No such file or directory
hexdump: /dev/sdb2: No such file or directory
hexdump: /dev/sdb3: No such file or directory
hexdump: /dev/sdb3: No such file or directory

I had to create my device.map file
nano /boot/grub/device.map:


hd0 /dev/mapper/via_ceedgdabjh2
hd1 /dev/mapper/via_ceedgdabjh1
hd2 /dev/mapper/via_ceedgdabjh3

I've confirmed that the second volume is my boot partition on the dmraid from gparted.

Thanks in advance for any help!

[PCFascist]

hah! I feel dumb I was specifying a partition in my device.map, I needed to give the entire drive~!

I changed the device.map to


hd0 /dev/mapper/via_ceedgdabjh

I was then able to run find /boot/grub/stage1

grub> device (hd0) /dev/mapper/via_ceedgdabjh
device (hd0) /dev/mapper/via_ceedgdabjh
grub> find /boot/grub/stage1
find /boot/grub/stage1
(hd0,0)
grub>

[PCFascist]

Now this ended in a error 17 when I try to boot...

Regardless of boot order of the drives...


I had two different grub folders at this point on the drive. I deleted one of them...

[PCFascist]

If i change the bios to 'raid' my drives I then get and error 15. I can run find /boot/grub/stage1 and run the root,setup commands from the grub prompt, I get no change when I boot.

When I boot into the live cd I see that my 1st partition is still there. (which I had made for /boot, but since I was still having issues I thought I'd just move boot to the root partition.)
I've deleted it now and will run grub setup...

[PCFascist]

Hrm, looks like I've neglected to run the following command after running grub setup


update-initramfs -u

This allowed me to not get any errors from grub and once I added pci=nomsi to my boot line I was able to start launching linux and it failed when it tried to grab the image off of /dev/hdb1 which I don't have...

Booting back into the Live CD.

Adding rmraid to my /etc/initramfs-tools/modules file and running the initramfs update again... allowed me to boot when I also changed the menu.lst file to point to the /dev/mapper/via_uuid

I got a failed ext3 check as it was unable to find a UUID device, but who cares it boots!

[haider_up32]

mhk@mhk-desktop:~$ ls -l /dev/mapper
total 0
crw-rw---- 1 root root 10, 61 Aug 16 2009 control
brw-rw---- 1 root disk 252, 0 Aug 15 20:50 isw_feacijab_Volume0
brw-rw---- 1 root disk 252, 1 Aug 15 20:50 isw_feacijab_Volume01
brw-rw---- 1 root disk 252, 2 Aug 15 20:50 isw_feacijab_Volume02


i have recently made a raid array . i just need to mount on ubuntu 9.04 . i have installed dmraid ..what to do next?? Ubuntu is installed on non-raid disk.

[haider_up32]

dmraid -r
/dev/sdc: isw, "isw_feacijab", GROUP, ok, 976773166 sectors, data@ 0
/dev/sdb: isw, "isw_feacijab", GROUP, ok, 976773166 sectors, data@ 0

[haider_up32]

How shud i mount partition created in raid arrays?? it is recognised by dmraid



root@mhk-desktop:/home/mhk# sudo dmraid -ay
RAID set "isw_feacijab_Volume0" already active
RAID set "isw_feacijab_Volume01" already active
RAID set "isw_feacijab_Volume02" already active

root@mhk-desktop:/home/mhk# sudo fdisk /dev/mapper/isw_feacijab_Volume0

The number of cylinders for this disk is set to 121602.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): p

Disk /dev/mapper/isw_feacijab_Volume0: 1000.2 GB, 1000210694144 bytes
255 heads, 63 sectors/track, 121602 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xb36a5ff6

Device Boot Start End Blocks Id System
/dev/mapper/isw_feacijab_Volume0p1 * 1 893 7172991 7 HPFS/NTFS
/dev/mapper/isw_feacijab_Volume0p2 894 1786 7173022+ 7 HPFS/NTFS

Command (m for help):


root@mhk-desktop:/home/mhk# dmraid -s
*** Group superset isw_feacijab
--> Active Subset
name : isw_feacijab_Volume0
size : 1953536512
stride : 256
type : stripe
status : ok
subsets: 0
devs : 2
spares : 0