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Revision as of 11:25, 9 November 2013
, 11:25, 9 November 2013→Recovering SME Server with lvm drives
==Recovering SME Server with lvm drives==
==Recovering SME Server with lvm drives==
==Method A==
The purpose of this howto is to give to you the abilities to access to your data if the SME Server 8 is broken and can't start in a normal way.
you have several methods below, but all are done on a default Raid over LVM, therefore you might need to adapt to your configuration, if necessary.
If your issue concerns a grub issue, you should look to this [[Grub|wiki page]]
===Method with the official SME Server CDROM ===
I presume that your SME Server is on a RAID over LVM, otherwise you will have to adapt this HOWTO.
* start the system with your official SME Server CDROM
* give at prompt : '''linux rescue'''
* set your language and your keyboard
* set to '''no''' the start of network interfaces
* set to '''continue''' the question about how the system is mounted in /mnt/sysimage
* set to '''ok'''
* give at prompt :
chroot /mnt/sysimage
su -
Now you have successfully mounted your LVM and you are able to read your data in a chroot environment, you can save them on a usb disk
* to exit
exit
exit
halt
===Method with SystemRescueCd===
{{note box| We go to work with [http://www.sysresccd.org/SystemRescueCd_Homepage SystemRescueCd] which is a Linux system rescue disk available as a bootable CD-ROM or USB stick for administrating or repairing your system and data after a crash.[http://www.sysresccd.org/Download Download]. The goal is to get mounted your logical volumes on /mnt where you can save them on a usb disk.}}
start the system with your system rescue cd or you usb stick, choose your keyboard settings
then start the server X
startx
open a terminal to verify if your raid is initiated.
cat /proc/mdstat
if you are lucky the output will look like this
# cat /proc/mdstat
Personalities : [raid1]
md99 : active raid1 sdb1[1] sda1[0]
104320 blocks [2/2] [UU]
md100 : active raid1 sdb2[1] sda2[0]
262036096 blocks [2/2] [UU]
unused devices: <none>
so we need to launch the LVM
vgchange -ay
afterward if the LVM is launched without error messages, we can mount the LVM in /mnt
mkdir /mnt/recover
mount /dev/main/root /mnt/recover
{{tip box|if you have a name of logical volume who is not '''/dev/main/root''', you can type this command for knowing all your logical volume, and adapt this to your configuration.}}
lvdisplay
Now you have successfully mounted your LVM and you are able to read your data on /mnt/recover, you can save them on a usb disk with the file browser for example.
===Method ===
Let’s try starting the raid and see what we get:
Let’s try starting the raid and see what we get:
user@user-desktop:~$
user@user-desktop:~$
==Method B==
===Method with a ubuntu Cdrom===
based on http://www.linuxjournal.com/article/8874?page=0,0
based on http://www.linuxjournal.com/article/8874?page=0,0
