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#1 2017-02-20 07:45:30

vonflynee
Member
From: Poland
Registered: 2014-12-12
Posts: 14
Website

OVH - RAID1 - System won't boot

I've got OVH server with 2x2TB HDDs.
I've installed ArchLinux via OVH's automatic installer, with RAID1:

$ sudo mdadm --misc --detail /dev/md2
/dev/md2:
        Version : 0.90
  Creation Time : Fri Nov 25 21:49:30 2016
     Raid Level : raid1
     Array Size : 40958912 (39.06 GiB 41.94 GB)
  Used Dev Size : 40958912 (39.06 GiB 41.94 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 2
    Persistence : Superblock is persistent

    Update Time : Mon Feb 20 08:22:42 2017
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : 2a175e29:7a09ddc7:a4d2adc2:26fd5302
         Events : 0.24

    Number   Major   Minor   RaidDevice State
       0       8        2        0      active sync   /dev/sda2
       1       8       18        1      active sync   /dev/sdb2
$ sudo mdadm --misc --detail /dev/md4
/dev/md4:
        Version : 0.90
  Creation Time : Fri Nov 25 21:49:30 2016
     Raid Level : raid1
     Array Size : 1908453312 (1820.04 GiB 1954.26 GB)
  Used Dev Size : 1908453312 (1820.04 GiB 1954.26 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 4
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Mon Feb 20 08:23:42 2017
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : c14eba0d:57f5ac68:a4d2adc2:26fd5302
         Events : 0.6

    Number   Major   Minor   RaidDevice State
       0       8        4        0      active sync   /dev/sda4
       1       8       20        1      active sync   /dev/sdb4

The server was using OVH's kernel 4.9.8 but unfortunately it lacks support of loading modules

$ uname -a
Linux wtc 4.9.8-xxxx-std-ipv6-64 #1 SMP Mon Feb 6 14:24:20 CET 2017 x86_64 GNU/Linux

After installing official ArchLinux kernel with

$ pacman -S linux

modifying 

/etc/mkinitcpio.conf
HOOKS="base udev mdadm_udev lvm2 autodetect modconf block filesystems keyboard fsck"
MODULES="dm_mod"

and 

/boot/grub/grub.cfg
menuentry "Arch Linux" {
        insmod part_gpt
        insmod part_gpt
        insmod diskfilter
        insmod mdraid09
        insmod ext2
        set root='mduuid/2a175e297a09ddc7a4d2adc226fd5302'
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root --hint='mduuid/2a175e297a09ddc7a4d2adc226fd5302'  26629b0f-51ea-46bc-aed6-4a7f22d74532
        else
          search --no-floppy --fs-uuid --set=root 26629b0f-51ea-46bc-aed6-4a7f22d74532
        fi
        linux   /boot/vmlinuz-linux root=/dev/md2 rw  quiet
}

the system won't boot. Journalctl isn't recording any logs from boot.
How can I make it boot the official kernel?

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#2 2017-02-20 12:09:47

Slithery
Administrator
From: Norfolk, UK
Registered: 2013-12-01
Posts: 5,776

Re: OVH - RAID1 - System won't boot

Is this relevant?

https://bbs.archlinux.org/viewtopic.php?id=214512

No, it didn't "fix" anything. It just shifted the brokeness one space to the right. - jasonwryan
Closing -- for deletion; Banning -- for muppetry. - jasonwryan

aur - dotfiles

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#3 2017-02-20 12:27:10

olegabrielz
Member
From: Norway
Registered: 2015-12-23
Posts: 255

Re: OVH - RAID1 - System won't boot

I just did a google search and found this:
https://www.ovh.co.uk/dedicated_servers … hlinux.xml
There the kernel in use is the linux-lts. I know nothing of this subject. But I thought it was worth mentioned.

Be aware of my Newbie Powers

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#4 2017-02-20 12:38:22

vonflynee
Member
From: Poland
Registered: 2014-12-12
Posts: 14
Website

Re: OVH - RAID1 - System won't boot

I don't want to use anything from OVH - just the official Archlinux kernel.

slithery wrote:

Unfortunately, no. OVH distributes many of the kernels for ArchLinux - but I want only the stock and clean kernel from ArchLinux.

Last edited by vonflynee (2017-02-20 12:41:20)

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#5 2017-02-20 12:53:14

frostschutz
Member
Registered: 2013-11-15
Posts: 1,499

Re: OVH - RAID1 - System won't boot

I've installed ArchLinux via OVH's automatic installer, with RAID1:

Just boot a rescue system, wipe everything & then install ArchLinux yourself from scratch, not using any installers/images provided by your hoster.

It's more work but you get a clean system. You ended up with an odd kernel and archaic raid metadata format (0.90 should no longer be used, go with 1.2, or perhaps 1.0 if it's /boot).

Either that or cross fingers and fully embrace whatever customizations your hoster provides (which means, not replacing the kernel, and talk to the hoster if there's a problem with that).

Last edited by frostschutz (2017-02-20 12:54:01)

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#6 2017-02-20 12:54:44

vonflynee
Member
From: Poland
Registered: 2014-12-12
Posts: 14
Website

Re: OVH - RAID1 - System won't boot

I cannot do this because I've got around 600 gigs of important files on it...

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#7 2017-02-20 18:55:25

Slithery
Administrator
From: Norfolk, UK
Registered: 2013-12-01
Posts: 5,776

Re: OVH - RAID1 - System won't boot

Just reinstall from scratch and then restore all of your important files from your most recent backup.

No, it didn't "fix" anything. It just shifted the brokeness one space to the right. - jasonwryan
Closing -- for deletion; Banning -- for muppetry. - jasonwryan

aur - dotfiles

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#8 2017-02-27 06:56:55

vonflynee
Member
From: Poland
Registered: 2014-12-12
Posts: 14
Website

Re: OVH - RAID1 - System won't boot

I've reinstalled the system from scratch but the problem still exists. I cannot boot the system. I've used IPMI provided by OVH to connect to the server but the console mode stucked on boot options and I can't pick any of them. The Java (graphical) mode shows black screen.

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