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Re: [Xen-users] Boot from OCFS2

To: "Dominik Vogt" <dominik.vogt@xxxxxxxxxxxx>
Subject: Re: [Xen-users] Boot from OCFS2
From: "Waldirio Manhães Pinheiro" <waldirio@xxxxxxxxx>
Date: Thu, 3 Jul 2008 08:05:18 -0300
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
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    Good Morning Dominik
  Let's try explain the implementation of ocfs2 in guest machine (in my case RedHat).
  I have created the Oracle RAC summary and one point of the procedure is the implementation of ocfs2. Because of size, I removed all another points, keep only ocfs (later I'll put in my web site the full document).
  When you configure using ocfs2console (graphical environment), you'll inform the IP address of machines which will access the shared file system, at the finish, will be created one ocfs config file (/etc/ocfs2/cluster.conf) with this content (in my case)
        ip_port = 7777
        ip_address =
        number = 0
        name = cambeba.mydomain.com
        cluster = ocfs2

        ip_port = 7777
        ip_address =
        number = 1
        name = cangua.mydomain.com
        cluster = ocfs2

        node_count = 2
        name = ocfs2

At the finish of configuration, the tool ocfs2console have the option "Propagate Configuration" which will share this configuration with all another nodes configured.

The next step is create a partition (can be using lv for example) and format using ocfs2
1. Create using lvm (pvcreate/vgcreate/lvcreate)
2. Formatting using ocfs2 (mkfs.ocfs2 <path created before for lvcreate>)
3. Mount automatically the partition by fstab (include in fstab like below) and later "# mount -a"

/dev/ocfs2/ocfs_01   /ocfs_01                ocfs2    _netdev, datavolume,nointr        0 0


PS: Create a lvm and format just on one node, at another nodes only include on fstab and enjoy


PS2: The attached document was written in Portuguese, so if you have any problem or doubt to understand, reply.


Any doubt or "append" for this procedure, reply :)


Good luck


2008/7/3, Dominik Vogt <dominik.vogt@xxxxxxxxxxxx>:
Hello Waldirio,

No doubt's, it's just a fact that I cant boot from ocfs2. My systems are
all debian etch. So just for understanding what I did (Maybe I
understood all wrong about ocfs2)

So I create a Volume Group, in this case it is about 1.5TB. Then I
create vor every domu a Logical Volume, and format it with ocfs2
filesystem. After that i install a system on that Logical Volume, it's
working until this. but if I want to start the domu, xen starts the
system but on boot it can't find the root partition! so it seems like
the kernel can't initalize the ocfs2 fs during startup.

Do I have to do some special things to get it running?

Thanks and A nice day,

Am Mittwoch, den 02.07.2008, 14:01 -0300 schrieb Waldirio Manhães
> Hello Dominik
> What you doubt about ocfs2 implementation (all doubt or at specific
> point) ?!, and what the Operating System ?!
> Cheers
> Waldirio
> 2008/6/27 Dominik Vogt <dominik.vogt@xxxxxxxxxxxx>:
>         Dear List,
>         I'm thinking about using xen productive in our datacenter, i'm
>         still
>         testing around with it. Now I got some questions, just for
>         basic
>         understanding, we got for example this environment:
>         2 Nodes
>         1 SCSI Pool server (Connected via scsi to both nodes)
>         Now I want to build a "cluster" so i would like to make this:
>         Node 1 -> Primary   -|                          | --> domU 1
>         (LV/OCFS2)
>                             |-> SCSI POOL 1.5TB (VG)   | --> domU 2
>         (LV/OCFS2)
>         Node 2 -> Secondary -|                          | --> domU 3
>         (LV/OCFS2)
>         So the reason, why I use ocfs2 is, because I access the same
>         Disk with 2
>         Nodes via scsi. It would destroy the fs, if I use ext3
>         (normaly).
>         but.... I can't boot the domU's form a ocfs2 filesystem... So
>         I tried to
>         setup a domU and installed ocfs2 into it, after that I cloned
>         the system
>         into a ocfs2 lv, but if I start it, it can't find the root
>         filesystem.
>         what else do I have to attend to get a system startet from a
>         ocfs2
>         filesystem? Or is this the wrong way?
>         Regards, D. Vogt
>         _______________________________________________
>         Xen-users mailing list
>         Xen-users@xxxxxxxxxxxxxxxxxxx
>         http://lists.xensource.com/xen-users
> --
> ______________
> Atenciosamente
> Waldirio
> msn: wmp@xxxxxxxxxxxxx
> Site: www.waldirio.com.br
> Blog: blog.waldirio.com.br
> PGP: www.waldirio.com.br/public.html
Dominik Vogt
Universität Bern
Institut für medizinische Lehre (IML)
Abteilung für Assessment und Evaluation (AAE)
Inselspital 37a
CH-3010 Bern

Phone: 031 632 3584
Mail: dominik.vogt@xxxxxxxxxxxx

msn: wmp@xxxxxxxxxxxxx
Site: www.waldirio.com.br
Blog: blog.waldirio.com.br
PGP: www.waldirio.com.br/public.html

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