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wellno1
n00b
Joined: 07 Mar 2006
Posts: 19
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 Posted: Sun Mar 14, 2010 6:31 pm Post subject: [solved]LVM + RAID: Boot problems |
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Hi m8,
I'm new to Gentoo and I'm having some problem to mount some md devices at boot after re-compiling the kernel. I mean, I have a Genkernel-built kernel which works, but now I need to re-compile the kernel in order to activate some moduls.
As you know, Genkernel create a initramfs image which actually works with my configuration. I tried to compile the kernel again, both with genkernel and manually, and noway to make it run. Kernel panic when trying to mount root (md device) on /root. Well, here some details:
| Code: | xiscosan ~ # uname -a
Linux xiscosan 2.6.31-gentoo-r6 #1 SMP Sat Mar 6 00:43:45 CET 2010 x86_64 AMD Phenom(tm) II X2 545 Processor AuthenticAMD GNU/Linux
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| Code: | xiscosan ~ # cat /etc/fstab
/dev/md1 /boot ext4 noauto,noatime 1 2
/dev/md4 / ext4 noatime 0 1
/dev/GENTOO/home /home xfs noatime 1 2
/dev/GENTOO/usr /usr xfs noatime 1 2
/dev/GENTOO/opt /opt xfs noatime 1 2
/dev/GENTOO/var /var xfs noatime 1 2
/dev/GENTOO/tmp /tmp xfs noatime 1 2
/dev/md3 none swap sw 0 0
shm /dev/shm tmpfs nodev,nosuid,noexec 0 0
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| Code: | xiscosan ~ # cat /boot/grub/grub.conf
default 0
timeout 30
splashimage=(hd1,0)/boot/grub/splash.xpm.gz
title Gentoo Linux 2.6.31-r6 by xesco
root (hd1,0)
kernel /boot/kernel-xisco-x86_64-2.6.31-gentoo-r6 dmraid lvm vga=791 agp=try_unsupported root=/dev/ram0 real_root=/dev/md4
initrd /boot/initramfs-xisco-x86_64-2.6.31-gentoo-r6
title Gentoo Linux 2.6.31-r6 by xesco (rescue)
root (hd1,0)
kernel /boot/kernel-xisco-x86_64-2.6.31-gentoo-r6 root=/dev/ram0 init=/bin/bb
initrd /boot/initramfs-xisco-x86_64-2.6.31-gentoo-r6
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| Code: | xiscosan ~ # cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty]
md3 : active raid1 sdd1[2] sdb1[0] sdc1[1] sde1[3]
979840 blocks [4/4] [UUUU]
md2 : active raid5 sdd2[2] sdb2[0] sdc2[1] sde2[3]
1435536000 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
md1 : active raid0 sdd3[2] sdb3[0] sdc3[1] sde3[3]
2345216 blocks 64k chunks
md4 : active raid5 sdd4[2] sdb4[0] sdc4[1] sde4[3]
15759552 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
unused devices: <none>
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| Code: | xiscosan ~ # lvscan
ACTIVE '/dev/GENTOO/home' [250.00 GiB] inherit
ACTIVE '/dev/GENTOO/usr' [50.00 GiB] inherit
ACTIVE '/dev/GENTOO/var' [50.00 GiB] inherit
ACTIVE '/dev/GENTOO/tmp' [50.00 GiB] inherit
ACTIVE '/dev/GENTOO/opt' [50.00 GiB] inherit
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As you can see, root device is a RAID5 md device (/dev/md4).
My question is: do I need to create a initramfs image? If possible, I would prefer not to use it.
In the kernel I activated (built-in) support for RAID0,1,2 and 5 and LVM (plus generic AHCI support): must I activate some more moduls?
Regards,
xesco
Last edited by wellno1 on Mon Mar 15, 2010 9:55 pm; edited 1 time in total |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54785
Location: 56N 3W
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| Posted: Sun Mar 14, 2010 6:54 pm Post subject: |
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anarxisco,
As your root filesystem is outside LVM, you do not need an initrd.
The partitions donated to the kernel raid set must be marked as type 0xfd and the kernel raid autoassemble option must be on.
You will no longer use mdadm to assemble your raid sets as you won't have an initrd to put it in.
Here is some of my setup - Partitions | Code: | $ sudo fdisk /dev/sda -l
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0553caf4
Device Boot Start End Blocks Id System
/dev/sda1 * 1 5 40131 fd Linux raid autodetect
/dev/sda2 6 70 522112+ 82 Linux swap / Solaris
/dev/sda4 71 121601 976197757+ 5 Extended
/dev/sda5 71 724 5253223+ fd Linux raid autodetect
/dev/sda6 725 121601 970944471 fd Linux raid autodetect |
four identical drives.
SCSI setup
| Code: | │ │ < > RAID Transport Class │ │
│ │ -*- SCSI device support │ │
│ │ < > SCSI target support │ │
│ │ [*] legacy /proc/scsi/ support │ │
│ │ *** SCSI support type (disk, tape, CD-ROM) *** │ │
│ │ <*> SCSI disk support │ │
│ │ < > SCSI tape support │ │
│ │ < > SCSI OnStream SC-x0 tape support │ │
│ │ <*> SCSI CDROM support │ │
│ │ [ ] Enable vendor-specific extensions (for SCSI CDROM) │ │
│ │ <*> SCSI generic support |
Kernel Raid options
| Code: | │ │ --- Multiple devices driver support (RAID and LVM) │ │
│ │ <*> RAID support │ │
│ │ [*] Autodetect RAID arrays during kernel boot │ │
│ │ < > Linear (append) mode │ │
│ │ < > RAID-0 (striping) mode │ │
│ │ <*> RAID-1 (mirroring) mode │ │
│ │ < > RAID-10 (mirrored striping) mode (EXPERIMENTAL) │ │
│ │ <*> RAID-4/RAID-5/RAID-6 mode │ │
│ │ [ ] RAID-4/RAID-5/RAID-6 Multicore processing (EXPERIMENTAL)│ │
│ │ < > Self test for hardware accelerated raid6 recovery │ │
│ │ < > Multipath I/O support │ │
│ │ < > Faulty test module for MD │ │
│ │ <*> Device mapper support |
Note that all the boot options are built in, not modules as modules cannot be loaded until root is mounted - they live in /lib/modules/`uname -r`/
An initrd is a fake root filesystem, so anything can be modules except the kernel code to read the initrd.
You will also need support for your disk controller hardware in
| Code: | | <*> Serial ATA and Parallel ATA drivers ---> |
again as built in, not modules
Grub setup partial
| Code: | #2.6.33-gentoo
title=Kernel 2.6.33-gentoo-r3 (hd0)
root (hd0,0)
kernel (hd0,0)/2.6.33-gentoo root=/dev/md5 vga=0x317 video=vesafb:mtrr:3,ywrap
title=Kernel 2.6.33-gentoo (hd1)
root (hd1,0)
kernel (hd1,0)/2.6.33-gentoo root=/dev/md5
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_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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wellno1
n00b
Joined: 07 Mar 2006
Posts: 19
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| Posted: Mon Mar 15, 2010 9:55 pm Post subject: |
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| Solved, thanks. I forgot to activate SCSI support |
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