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yarug
Tux's lil' helper
Joined: 01 Dec 2004
Posts: 84
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 Posted: Wed Jun 04, 2008 9:51 pm Post subject: [SOLVED] Software RAID1 and LVM2 with 2 SATA disks kernel pa |
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Hi,
I'm reinstalling an AMD64 Sun Fire X2100 and want to use a software RAID mirror (RAID1) on 2 SATA disks. I've followed the instructions from these resources:
http://www.gentoo.org/doc/en/handbook/handbook-amd64.xml?full=1
http://gentoo-wiki.com/HOWTO_Gentoo_Install_on_Software_RAID_mirror_and_LVM2_on_top_of_RAID
http://www.gentoo.org/doc/en/gentoo-x86+raid+lvm2-quickinstall.xml
I'm using genkernel. I've compiled the genkernel using genkernel --install --lvm2 --dmraid all.
When it is time to reboot into the new installation, I get the following message at startup:
md: Autodetecting RAID arrays.
md: Scanned 0 and added 0 devices.
md: autorun ...
md: ... autorun DONE.
After which I get a kernel panic as the boot process cannot find a root partition (I believe it thinks my cd-rom drive is now /dev/sda).
My /etc/fstab:
| Code: | # /etc/fstab: static file system information.
#
# noatime turns off atimes for increased performance (atimes normally aren't
# needed; notail increases performance of ReiserFS (at the expense of storage
# efficiency). It's safe to drop the noatime options if you want and to
# switch between notail / tail freely.
#
# The root filesystem should have a pass number of either 0 or 1.
# All other filesystems should have a pass number of 0 or greater than 1.
#
# See the manpage fstab(5) for more information.
#
# <fs> <mountpoint> <type> <opts> <dump/pass>
# NOTE: If your BOOT partition is ReiserFS, add the notail option to opts.
/dev/md1 /boot ext2 noauto,noatime 1 2
/dev/md2 none swap sw 0 0
/dev/md3 / reiserfs noatime 0 0
/dev/vg/usr /usr reiserfs noatime 0 0
/dev/vg/home /home reiserfs noatime 0 0
/dev/vg/opt /opt reiserfs noatime 0 0
/dev/vg/var /var reiserfs noatime 0 0
/dev/vg/tmp /tmp reiserfs noatime 0 0
/dev/dvd /mnt/dvd auto noauto,user,ro 0 0
#/dev/fd0 /mnt/floppy auto noauto 0 0
# NOTE: The next line is critical for boot!
proc /proc proc defaults 0 0
# glibc 2.2 and above expects tmpfs to be mounted at /dev/shm for
# POSIX shared memory (shm_open, shm_unlink).
# (tmpfs is a dynamically expandable/shrinkable ramdisk, and will
# use almost no memory if not populated with files)
shm /dev/shm tmpfs nodev,nosuid,noexec 0 0 |
Here is my /boot/grub/grub.conf:
| Code: | default 0
timeout 9
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
title=Gentoo Linux 2.6.24
root (hd0,0)
kernel /boot/kernel-genkernel-x86_64-2.6.24-gentoo-r8 root=/dev/ram0 init=/linuxrc ramdisk=8192 real_root=/dev/md3 udev vga=0x318 video=vesafb:mtrr:3,ywrap dodmraid dolvm initrd /boot/initramfs-genkernel-x86_64-2.6.24-gentoo-r8
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A few specific questions:
1) Is it dolvm or dolvm2 in the grub kernel command?
2) Should I include dodmraid or not?
3) Should I include doscsi?
4) Should I include any modules like md, raid1 or dm-mod in /etc/modules.autoload.d/kernel-2.6?
5) Is /dev/md3 the correct value for real_root?
Can anyone help me find out what I may have overlooked?
Many thanks,
Nes
Last edited by yarug on Thu Jun 05, 2008 6:55 pm; edited 1 time in total |
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drescherjm
Advocate
Joined: 05 Jun 2004
Posts: 2722
Location: Pittsburgh, PA, USA
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| Posted: Wed Jun 04, 2008 10:59 pm Post subject: |
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| Quote: | | 1) Is it dolvm or dolvm2 in the grub kernel command? |
If the raid is not on top of lvm there is no need to do that.
| Quote: |
2) Should I include dodmraid or not? |
You do not have dmraid but do have mdraid.
Drop the --dmraid and replace it with --mdadm
| Quote: | | 4) Should I include any modules like md, raid1 or dm-mod in /etc/modules.autoload.d/kernel-2.6? |
This will not help. Compile the md, raid1 and the sata driver into the kernel.
| Quote: | | 3) Should I include doscsi? |
No.
| Quote: | | 5) Is /dev/md3 the correct value for real_root? |
Yes /dev/md3 is the real_root
Are your drives partitioned such that the type of the raid volumes is fd?
_________________
John
My gentoo overlay
Instructons for overlay |
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yarug
Tux's lil' helper
Joined: 01 Dec 2004
Posts: 84
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| Posted: Wed Jun 04, 2008 11:13 pm Post subject: |
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Hi drescherjm, thank you for your reply. Here are the answers to your questions (and some more questions from me):
| Quote: | If the raid is not on top of lvm there is no need to do that.
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The LVM2 is on top of the RAID1. I.e. /dev/md4 is used by LVM2.
| Quote: | You do not have dmraid but do have mdraid.
Drop the --dmraid and replace it with --mdadm |
You mean when running genkernel? I.e. the genkernel command should be genkernel --install --lvm2 --mdadm --menuconfig all? Then use menuconfig to make sure MD, RAID1 and SATA are compiled into the kernel?
| Quote: | | Are your drives partitioned such that the type of the raid volumes is fd? |
Yes, all 4 partitions (incl. swap) are fd.
I will try with the new genkernel command!
Regards,
Nes |
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drescherjm
Advocate
Joined: 05 Jun 2004
Posts: 2722
Location: Pittsburgh, PA, USA
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| Posted: Thu Jun 05, 2008 3:00 am Post subject: |
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| Quote: | I.e. the genkernel command should be genkernel --install --lvm2 --mdadm --menuconfig all? Then use menuconfig to make sure MD, RAID1 and SATA are compiled into the kernel?
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First make sure you have a valid /etc/mdadm.conf
Then
| Code: | | genkernel --install --lvm2 --mdadm --menuconfig all |
And make the md, raid1 and sata driver compiled into the kernel.
BTW, I assume when it does not boot you get a prompt that says you can not mount root and asks you for the root or shell
if you type shell you can
cat /etc/partitions
and cat /proc/mdstat
to see what drives are available. This has helped me dozens of times fix these kinds of problems.
_________________
John
My gentoo overlay
Instructons for overlay |
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yarug
Tux's lil' helper
Joined: 01 Dec 2004
Posts: 84
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| Posted: Thu Jun 05, 2008 11:17 am Post subject: |
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Yes, I have a valid (I hope!) /etc/mdadm.conf. I installed the new genkernel, but won't be able to reboot until I get to the datacenter tonight (need to take the live cd out). Fingers crossed.
ps: It didn't fall back (or provide an option to fall back) to a prompt when the boot process stopped at kernel panic.
Thanks again. Will let the forum know how it went.
Nes |
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drescherjm
Advocate
Joined: 05 Jun 2004
Posts: 2722
Location: Pittsburgh, PA, USA
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| Posted: Thu Jun 05, 2008 12:55 pm Post subject: |
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Is your initrd line in grub on a second line and not on the same line as the kernel?
It should be:
| Code: | efault 0
timeout 9
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
title=Gentoo Linux 2.6.24
root (hd0,0)
kernel /boot/kernel-genkernel-x86_64-2.6.24-gentoo-r8 root=/dev/ram0 init=/linuxrc ramdisk=8192 real_root=/dev/md3 udev vga=0x318 video=vesafb:mtrr:3,ywrap dodmraid dolvm
initrd /boot/initramfs-genkernel-x86_64-2.6.24-gentoo-r8 |
The video part is on the same line as the kernel but wrapped here.
_________________
John
My gentoo overlay
Instructons for overlay |
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yarug
Tux's lil' helper
Joined: 01 Dec 2004
Posts: 84
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| Posted: Thu Jun 05, 2008 6:54 pm Post subject: |
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It was all on one line!
Thank you so much. I would never have spotted that.
The corrected grub.conf:
| Code: | default 0
timeout 9
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
title=Gentoo Linux 2.6.24
root (hd0,0)
kernel /boot/kernel-genkernel-x86_64-2.6.24-gentoo-r8 root=/dev/ram0 init=/linuxrc ramdisk=8192 udev real_root=/dev/md3 dolvm lvmraid=/dev/md1,/dev/md2,/dev/md3,/dev/md4 vga=0x318 video=vesafb:mtrr:3,ywrap
initrd /boot/initramfs-genkernel-x86_64-2.6.24-gentoo-r8
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That, together with the lvm2 and mdadm options for the genkernel and compilling in mdadm and lvm2 got the system going:
| Code: | | genkernel --install --lvm2 --mdadm --menuconfig all |
I can boot into the machine now. A few minor things to clean up, but I can continue now.
Many thanks for your support!
All the best,
Nes |
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