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

[Paul O'Rorke]

In a functional classic 3 node set up what is the expected state of the 
secondary node that is the lower resource with regards the upper resource?

trk-kvm-01 (primary for both resource levels)

    root at trk-kvm-01:~/scripts# drbd-overview
    [...]
      12:convirt/0                Connected Primary/Secondary  
    UpToDate/UpToDate _convirt           vda virtio
    [...]
    120:convirt-U/0         ^^12 Connected Primary/Secondary  
    UpToDate/UpToDate

trk-kvm-02 (secondary lower resource)

    root at trk-kvm-02:~/scripts# drbd-overview
    [...]
      12:convirt/0                Connected    Secondary/Primary
    UpToDate/UpToDate _convirt           vda virtio
    [...]
    120:convirt-U/0         ^^12 Unconfigured . .

trk-kvm-03 (secondary on upper resource)

    root at trk-kvm-03:/media/scratch# drbd-overview
    [...]
    120:convirt-U/0  Connected Secondary/Primary UpToDate/UpToDate

I see nowhere to set this node's IP yet the docs say this resource file 
"must be distributed across all nodes in the cluster — in this case, three
nodes."  What is the point of the convirt-U res file on trk-kvm-02?


*Paul O'Rorke*




On 2018-02-07 07:52 AM, Paul O'Rorke wrote:
>
> Oh my!!!!
>
> 2 weeks of missing that typo and frustration.  Thank you both Yannis 
> and Peter.  Peter, I thought you were pointing out the answer to my 
> question - which file is it failing to find.  I normally copy the .res 
> file to ensure they are always identical, and it was correct on nodes 
> 1 and 2....
>
> I really appreciate the help guys, it all makes sense now.  I was 
> worried that I had a serious misunderstanding in what I was doing.
>
>     root at trk-kvm-01:~# cat /proc/drbd
>     version: 8.4.5 (api:1/proto:86-101)
>     srcversion: 4B3E2E2CD48CAE5280B5205
>
>     [...]
>     12: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r-----
>         ns:4764 nr:0 dw:10719324 dr:21194772 al:1676 bm:0 lo:0 pe:0
>     ua:0 ap:0 ep:1 wo:f oos:0
>     [...]
>     120: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent A
>     r-----
>         ns:19642880 nr:0 dw:0 dr:19645043 al:0 bm:0 lo:0 pe:0 ua:0
>     ap:0 ep:1 wo:f oos:32782648
>         [======>.............] sync'ed: 37.5% (32012/51196)M
>         finish: 0:12:39 speed: 43,136 (38,896) K/sec
>
> and
>
>     root at trk-kvm-03:/media/scratch# drbd-overview
>     120:convirt-U/0  SyncTarget Secondary/Primary Inconsistent/UpToDate
>         [=======>............] sync'ed: 44.8% (28312/51196)M
>
> Makes me very happy!
>
> *Paul O'Rorke*
> *Tracker Software Products (Canada) Limited *
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>
> On 2018-02-07 04:22 AM, Yannis Milios wrote:
>> Did you fixed the typo that Peter mentioned on his last post ? That 
>> should be "internal" and not "inetrnal". Then must copy the resource 
>> file on all 3 nodes.
>>>> >>  meta-disk       inetrnal; 
>> After fixing that you should be able to create the metadata and 
>> initialize  the stacked device by:
>>
>> On trk-kvm-01 (assuming that this is the primary node):
>> drbdadm create-md --stacked convirt-U
>>
>> On trk-kvm-03:
>> drbdadm create-md convirt-U    #this will create the required 
>> metadata on the underlying device (i.e /dev/trk-kvm-03-vg/convirt). 
>> No need to transfer metadata manually from trk-kvm-01)
>>
>> On trk-kvm-01:
>> drbdadm --stacked adjust convirt-U
>>
>> On trk-kvm-03:
>> drbdadm adjust convirt-U
>>
>> On trk-kvm-01:
>> drbdadm --stacked -- --overwrite-data-of-peer primary convirt-U
>> cat /proc/drbd
>>
>>
>>
>> Y
>>
>
>
>
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