Thank you much! Now I got it to work and I am closer in understanding
the concept!

Now, if you had a similar mini-howto to add "heartbeat" to the mix I'd
be set... :) 

Cheers, 
Rainer 


On Tue, 2005-08-02 at 10:36 -0400, Diego Julian Remolina wrote:
> > ^^ is the above now a funtioning mirror? Or do I have to
> > mount /dev/drbd0 on the Secondary as well? 
> > 
> > 
> > ^^ is the above now a funtioning mirror? Or do I have to
> > mount /dev/drbd0 on the Secondary as well? 
> > 
> 
> It looks good, but the only way for you to be totally convinced it is working is
> as follows (if you do not have heartbeat configured yet).
> 
> 1. On openfiler while being drbd primary:
> touch /mnt/disk/file_created_on_openfiler
> umount /mnt/disk
> 
> 2. On openfiler2 currently in secondary state:
> drbdadm primary YOUR_DRBD_DEVICE_NAME
> cat /proc/drbd and make sure that openfiler2 is now showing:
> 0: cs:Connected st:Primary/Secondary ld:Consistent
> which means that openfiler2 is now acting as drbd primary
> Now mount
> mkdir /mnt/disk
> mount /dev/drbd0 /mnt/disk
> ls /mnt/disk
> You should see the file:  file_created_on_openfiler
> So now create one from openfiler2:
> touch /mnt/disk/file_created_on_openfiler2
> umount /mnt/disk
> 
> 3. Back on openfiler, make it be drbd primary:
> drbdadm primary YOUR_DRBD_DEVICE_NAME
> cat /proc/drbd and make sure that openfiler is now showing:
> 0: cs:Connected st:Primary/Secondary ld:Consistent
> now 
> mount /dev/drbd0 /mnt/disk
> ls /mnt/disk
> 
> Now you should see the two files:
> file_created_on_openfiler
> file_created_on_openfiler2
> 
> Voila, you just switched machines and wrote to their own file systems which got
> replicated to the other machine trhough drbd.
> 
> Note you can NOT have a drbd device mounted on the secondary machine while it is
> on drbd Secondary state, not even read only.  The only way you can mount it is
> when the device shows as drbd primary on that machine.
> 
> HTH,
> 
> Diego
> 
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> 
Rainer A. Rohde  
Linux Support

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