[DRBD-user] Adding additional 'node' to DRBD

[Paul O'Rorke]

What does node-id do?  I have never used it and it's not listed in 
"Configuring your resource" 
https://docs.linbit.com/docs/users-guide-8.4/#s-configure-resource

My set up looks more like the example here:

resource r0 {
   on alice {
     device    /dev/drbd1;
     disk      /dev/sda7;
     address   10.1.1.31:7789;
     meta-disk internal;
   }
   on bob {
     device    /dev/drbd1;
     disk      /dev/sda7;
     address   10.1.1.32:7789;
     meta-disk internal;
   }
}

Is it a drbd 9.0.x / Linstore thing?  I'm using 8.9.6

*Paul O'Rorke*
*Tracker Software Products (Canada) Limited *
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On 2019-01-17 1:19 a.m., Roland Kammerer wrote:
> On Wed, Jan 16, 2019 at 09:47:05AM -0500, Shawn Southern wrote:
>> I'm very new to DRBD, so please bear with me if my terminology is wrong (or
>> if I've completely done everything wrong, please let me know!).  I've not
>> had much luck with finding this scenario in the documentation.
>>
>> Initially, I only had a single system I could configure.  The other
>> identical system was running Hyper-V, so I had to get a system up with
>> CentOS, KVM & DRBD then migrate the workloads, then reformat the Hyper-V
>> box as CentOS, KVM & DRBD).
>>
>> System 1 (vmh1) is 10.13.119.15, System 2 (vmh2) that I have to add is
>> 10.13.119.16.  I've got the workload migrated to 'vmh1' and 'vmh2' is now
>> reinstalled with CentOS, KVM & DRBD.  What I need to know is how do I
>> safely add the sdb & sdc in vmh2 to the existing single node DRBD so that
>> it safely replicates the data and I don't lose my workload?
> On both sides you change the res file like this:
>
>> in /etc/drdb.d I have:
>> file global_common.conf:
>> global {
>>   usage-count no;
>> }
>> common {
>>   net {
>>    protocol C;
>>   }
>> }
>>
>> file drbd0.res:
>> resource drbd0 {
>>          device /dev/drbd0;
>>          meta-disk internal;
>>          net {
>>                  cram-hmac-alg sha256;
>>                  shared-secret "ThisIsSecret1";
>>          }
>>          on vmh1 {
>>                  node-id 1;
>>                  address 10.13.119.15:7789;
>>                  disk /dev/sdb;
>>          }
> ^^ you add a "on vmh2" section with a different node-id;
>
> ^^ you add a "connection-mesh" section naming both nodes.
>
>> }
> Then you:
> - "drbdadm create-md" meta data on the second host
> - "drbdadm adjust" on both.
>
> Regards, rck
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