[ovirt-users] disaster recovery

[Nathanaël Blanchet]

Sure that ovirt is not directly concerned but this has been done 
following the foreman integration feature. So a warning doing this in a 
fc environnement could be very preventive.
My question was rather : now is there a possibility to recover this 
disk? After all, it is only a LVM disk with one VG per LUN and as much 
LV as much as existing VMs. Recovering LVM metadata might be enough?

Le 21/06/2015 20:23, Dan Yasny a écrit :
>
> Anaconda and Kickstart are dangerous in FC environments and have been 
> known to wipe all kinds of data if zoning wasn't properly done prior 
> to os deployment to new hosts.
>
> Nothing to do with oVirt, it's a common mistake people make at least 
> once before they step on this specific rake.
>
> On Jun 21, 2015 2:09 PM, "Nathanaël Blanchet" <blanchet at abes.fr 
> <mailto:blanchet at abes.fr>> wrote:
>
>     In a traditional installation of an ovirt host, it seems that
>     provisionning the OS is the first step before talking about vdsm.
>     I didn't go further, the problem is that this host saw the
>     production LUN and the kickstart took all the lun into the same VG
>     with a XFS format.
>     Yes it is an error from myself for not having dissociated the lun.
>     Yes it is an error from myself for not having taken care of having
>     snapshot lun level backup.
>     But now what should I do?
>     My idea was to use pvreduce to unlabel the LUN, and then using the
>     /etc/lvm/backup/lun for recovering physical volume metadata on
>     that lun (http://www.tldp.org/HOWTO/LVM-HOWTO/recovermetadata.html)
>
>     Le 21/06/2015 12:02, mots a écrit :
>
>         Let me get this straight:
>
>         You added a new host and instead of letting VDSM manage the VM
>         storage you added it manually, completely independent from
>         oVirt, during an unattended installation of the host OS? In a
>         production environment?
>
>         Why?
>           -----Ursprüngliche Nachricht-----
>
>             Von:Nathanaël Blanchet <blanchet at abes.fr
>             <mailto:blanchet at abes.fr>>
>             Gesendet: Fre 19 Juni 2015 14:09
>             An: users at ovirt.org <mailto:users at ovirt.org>
>             Betreff: [ovirt-users] disaster recovery
>
>             Hello all,
>
>             Here is what can happen as a nightmare for a sysadmin:
>
>             I installed a new host to my pool of pre existing ovirt
>             hosts with a
>             kickstart file and a default partitionning. I used to do
>             this with vms
>             that usually get one local disk.
>             But..
>             This time this host was attached to several existing ovirt
>             (production)
>             lun and anaconda gathered all existing disk (local and
>             lun) into the
>             same VG (lv_home) et formatted them with XFS....
>             In the webadmin, the domain storage became unvailaible,
>             vms were still
>             up (thankgoodness), but it was impossible to interact with
>             them. If I
>             stopped them, it was impossible to reboot them. If I
>             launch lvs command,
>             some hosts can still see the ovirt LV, but other see only
>             the lv_home
>             while /dev/[idofvms] are still present.
>             So it was my chance that vms were still present, and I
>             began to export
>             them with a tar at file system level so as to import them
>             in a new
>             domain storage.
>
>             It seems that data are still present because the vms are
>             still running.
>             So my question is really : instead of this difficult
>             export step, is
>             there a way to recover the initial format of the ovirt lun
>             so as to make
>             the lvm index come back on the disk?
>
>             Any help or disaster experience would be much appreciated.
>
>             -- 
>             Nathanaël Blanchet
>
>             Supervision réseau
>             Pôle Infrastrutures Informatiques
>             227 avenue Professeur-Jean-Louis-Viala
>             34193 MONTPELLIER CEDEX 5
>             Tél. 33 (0)4 67 54 84 55
>             Fax  33 (0)4 67 54 84 14
>             blanchet at abes.fr <mailto:blanchet at abes.fr>
>
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-- 
Nathanaël Blanchet

Supervision réseau
Pôle Infrastrutures Informatiques
227 avenue Professeur-Jean-Louis-Viala
34193 MONTPELLIER CEDEX 5 	
Tél. 33 (0)4 67 54 84 55
Fax  33 (0)4 67 54 84 14
blanchet at abes.fr

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