[DRBD-user] Understanding "classic" 3 node set up.

Paul O'Rorke paul at tracker-software.com
Tue Feb 6 22:09:58 CET 2018

Thanks Peter,

as I understand it when I created the original drbd device(s) on my 
local nodes this metadata was automatically created and placed at the 
end of the underlying LVM volume.  Clearly this is not happening when 
creating the drbd device on the third node.  So being stacked I believe 
I need the meta data from the lower resource and then create-md will add 
the required metadata for the stacked resource.

How do I get that original metadata on my underlying volume so that is 
can do so?  I tried taking a snapshot of the underlying LVM volume on 
trk-kvm-01 (lower resource primary) and used dd to copy that to the 
underlying volume on trk-kvm-03 (third node upper resource) but I get 
the same error.

So what do I need to do to get this metadata there so I can create this 
drbd device on the third node?

*Paul O'Rorke*

On 2018-02-05 11:45 PM, Peter Schwindt wrote:
> Paul,
> On 2018-02-05 19:27, Paul O'Rorke wrote:
>>      root at trk-kvm-03:~# drbdadm create-md convirt-U
>>      open(inetrnal) failed: No such file or directory
>>      open(inetrnal) failed: No such file or directory
>             ^^^^^^^^
> [...]
>> What file is it looking for that it fails to find?
>> The resource is defined with this:
> [...]
>>              on trk-kvm-03 {
>>                      device          /dev/drbd120;
>>                      disk            /dev/trk-kvm-03-vg/convirt;
>>                      address;
>>                      meta-disk       inetrnal;
>                                        ^^^^^^^^
> Best,
> Peter
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