Grub software raid problems

syamajala · 01-05-2005, 05:36 PM

hi! i'm having problems with grub. My system has 6 scsi drives with 2 scsi controllers. 3 drives r connected to each controller. My / partition is a software raid 0. I'm using 1 drive from ea. controller for the / partition (so only 2 drives r in the raid 0 /dev/sda1, /dev/sdd1) I don't have a separate boot partition. When I run root (hd0,0) everything is ok and it tells me the partition type is xfs which is what i am using on my / partition. When i run setup (hd0) it says it can't find the stage1 file and fails. I also tried root (hd1,0) and setup (hd1) it also tells me the file system is xfs, but fails when it looks for the stage1 file. Also, grub only shows me 4 drives (hd0, hd1, hd2, hd3). BTW I'm using gentoo. I know about
lists.us.dell.com/pipermail/linux-poweredge/2003-July/014331.html i've used it many times on systems with ide drives and a software raid and it has worked fine every single time.

jmeads · 01-06-2005, 07:45 AM

I think you need a seperate boot filesystem that is either a raid 1 or a single disk, IMHO.

Linux can't boot from a stripe, ie raid0, raid 5 etc

syamajala · 01-06-2005, 08:47 AM

Yeah, i backed up everything on my / and redid my partitions. I now have a raid 1 /boot, i installed grub, but when i boot the system after it detects all the hd nothing happens. It just sits there i never see the grub prompt or anything. Any ideas?

jmeads · 01-06-2005, 02:27 PM

did you write grub out to the mbr ? theres a good howto to grub and raid here

http://lists.us.dell.com/pipermail/l...ly/014331.html

kenji1903 · 01-07-2005, 03:37 AM

hope you boys don't mind me chipping in...
I'm having raid and grub problems as well... mine's simple, just a raid1 with 2 200gb drives.
my problem is everytime i reboot my server, grub won't load my kernel, i have to load it manually...
i tried grub-install but it keeps giving me this message:
/dev/md0 does not have any corresponding BIOS drive

what should i do?

jmeads · 01-07-2005, 12:44 PM

I have a similar setup here, 2 120G drives, my mdstat looks like this

# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 hda1[0] hdc1[1]
192640 blocks [2/2] [UU]

md1 : active raid1 hda2[0] hdc2[1]
117049472 blocks [2/2] [UU]

unused devices: <none>

I have md0 for /boot and I'm using lvm2 over md1 (root on lvm)

my grub device map
# cat /boot/grub/device.map
(hd0) /dev/hda
(hd1) /dev/hdc

And my grup menu.lst looks like: (comments removed)
# cat /boot/grub/menu.lst

title Debian GNU/Linux, kernel 2.6.8-1-386
root (hd0,0)
kernel /vmlinuz-2.6.8-1-386 root=/dev/mapper/vg01-root ro devfs=nomount
initrd /initrd.img-2.6.8-1-386
savedefault
boot

I think your root line should be something like root=/dev/md?/ ro

hope this helps

kenji1903 · 01-07-2005, 06:56 PM

ahh, cool~
Looks identical, just that I have some different settings that's all...

Code:

# cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 hdc2[1] hda2[0]
      152191680 blocks [2/2] [UU]
       
md2 : active raid1 hdc3[1] hda3[0]
      20482752 blocks [2/2] [UU]
       
md3 : active raid1 hdc5[1] hda5[0]
      20482752 blocks [2/2] [UU]
       
md0 : active raid1 hdc1[1] hda1[0]
      104320 blocks [2/2] [UU]
       
unused devices: <none>

Code:

# cat /boot/grub/device.map
(fd0)   /dev/fd0
(hd0)   /dev/hda
(hd1)   /dev/hdb

Code:

# cat /boot/grub/menu.lst
default=0
timeout=30
splashimage=(hd0,0)/grub/splash.xpm.gz
 
title Red Hat Linux (2.6.6-1)
        root (hd0,0)
        kernel /vmlinuz-2.6.6-1 ro root=/dev/md3
        initrd /initrd-2.6.6-1.img
 
title Red Hat Linux (2.4.20-8)
        root (hd0,0)
        kernel /vmlinuz-2.4.20-8 ro root=/dev/md3 hdd=ide-scsi
        initrd /initrd-2.4.20-8.img

Do have trouble with grub NOT automatically loading your kernel? Been trying to solve this mess for months!

syamajala · 01-07-2005, 07:10 PM

i was able to get my setup working after i read the grub faq. it says to disable int13 extensions and try grub, this is a known problem with some scsi controllers.