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Recovering SME Server with lvm drives (view source)

Revision as of 11:25, 9 November 2013

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→‎Recovering SME Server with lvm drives
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==Recovering SME Server with lvm drives==
 
==Recovering SME Server with lvm drives==
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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.
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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.
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If your issue concerns a grub issue, you should look to this [[Grub|wiki page]]
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===Method with the official SME Server CDROM ===
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I presume that your SME Server is on a RAID over LVM, otherwise you will have to adapt this HOWTO.
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* start the system with your official SME Server CDROM
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* give at prompt : '''linux rescue'''
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* set your language and your keyboard
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* set to '''no''' the start of network interfaces
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* set to '''continue''' the question about how the system is mounted in /mnt/sysimage
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* set to '''ok'''
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* give at prompt :
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chroot /mnt/sysimage
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su -
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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
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* to exit
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exit
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exit
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halt
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===Method with SystemRescueCd===
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{{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.}}
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start the system with your system rescue cd or you usb stick, choose your keyboard settings
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then start the server X
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startx
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open a terminal to verify if your raid is initiated.
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cat  /proc/mdstat
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if you are lucky the output will look like this
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# cat /proc/mdstat
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Personalities : [raid1]
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md99 : active raid1 sdb1[1] sda1[0]
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      104320 blocks [2/2] [UU]
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md100 : active raid1 sdb2[1] sda2[0]
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      262036096 blocks [2/2] [UU]
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unused devices: <none>
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so we need to launch the LVM
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vgchange -ay
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afterward if the LVM is launched without error messages, we can mount the LVM in /mnt
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mkdir /mnt/recover
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mount /dev/main/root /mnt/recover
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{{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.}}
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lvdisplay
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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.
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===Method ===
 
Let’s try starting the raid and see what we get:
 
Let’s try starting the raid and see what we get:
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  user@user-desktop:~$
 
  user@user-desktop:~$
   −
<noinclude>[[Category:Howto]]</noinclude>
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===Method with a ubuntu Cdrom===
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based on http://www.linuxjournal.com/article/8874?page=0,0
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on ubuntu (non lvm), install mdadm and lvm2, attach server drive,
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find UUID's
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$ sudo mdadm --examine --scan  /dev/sdb1 /dev/sdb2
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ARRAY /dev/md2 level=raid1 num-devices=2 UUID=895293be:9cfa7672:f1761508:386417bc
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ARRAY /dev/md1 level=raid1 num-devices=2 UUID=10573599:841f46aa:4c068816:67364324
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add ARRAY lines to mdadm.conf
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$ cat /etc/mdadm/mdadm.conf
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# mdadm.conf
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#
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# Please refer to mdadm.conf(5) for information about this file.
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#
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# by default, scan all partitions (/proc/partitions) for MD superblocks.
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# alternatively, specify devices to scan, using wildcards if desired.
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DEVICE partitions
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ARRAY /dev/md2 level=raid1 num-devices=2 UUID=895293be:9cfa7672:f1761508:386417bc
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ARRAY /dev/md1 level=raid1 num-devices=2 UUID=10573599:841f46aa:4c068816:67364324
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checking
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$  sudo pvscan
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  PV /dev/md2  VG main  lvm2 [148.94 GB / 64.00 MB free]
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  Total: 1 [148.94 GB] / in use: 1 [148.94 GB] / in no VG: 0 [0  ]
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checking
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$ sudo lvscan
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  ACTIVE            '/dev/main/root' [146.94 GB] inherit
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  ACTIVE            '/dev/main/swap' [1.94 GB] inherit
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mount, check and copy to safe location ...
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$ sudo mkdir /mnt/ga
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$ sudo mount /dev/main/root /mnt/ga
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$ sudo ls -la /mnt/ga/var/log/messages
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lrwxrwxrwx 1 root root 32 2010-03-24 18:00 /mnt/ga/var/log/messages -> /var/log/messages.20*
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<noinclude>[[Category:Howto]][[Category:Administration:Storage]]</noinclude>
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