[DRBD-user] COnfused about shared partitions

[Adam Goryachev]

On 5/4/19 5:09 am, JCA wrote:
> I believe that you are right in your assessment. Unfortunately, after 
> this I seem to be stuck in a situation in which both nodes are not 
> connected through DRBD:
>
> In A:
>
> # cat /proc/drbd
> version: 8.4.11-1 (api:1/proto:86-101)
> GIT-hash: 66145a308421e9c124ec391a7848ac20203bb03c build by 
> mockbuild@, 2018-11-03 01:26:55
>
>  1: cs:WFConnection ro:Primary/Unknown ds:UpToDate/DUnknown C r-----
>     ns:0 nr:0 dw:4 dr:2161 al:1 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:336
>
> #  drbdadm status
> my-data role:Primary
>   disk:UpToDate
>   peer connection:Connecting
>
> In B:
>
> # cat /proc/drbd
> version: 8.4.11-1 (api:1/proto:86-101)
> GIT-hash: 66145a308421e9c124ec391a7848ac20203bb03c build by 
> mockbuild@, 2018-11-03 01:26:55
>
>  1: cs:WFConnection ro:Secondary/Unknown ds:UpToDate/DUnknown C r-----
>     ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:24
>
> # drbdadm status
> my-data role:Secondary
>   disk:UpToDate
>   peer connection:Connecting
>
> I have tried numerous things - including rebooting both VMs where the 
> nodes live - to no avail.

Sounds like both sides have been a primary and so now they both think 
the other is out of date (ie, split brain). What you will need to do is 
tell DRBD which one should discard it's data and become secondary, you 
can then reconnect them and DRBD will re-copy the data, re-sync, and get 
back into a working state.

This is a good lesson to work out why you ended up with a split brain 
situation it sounds like:

1. server A was up while server B was down

2. server A went down, and then server B came up

3. server A then came up without any valid network connection to server B

or, you have a non-standard or incorrect config. DRBD (in my experience) 
would notice, catch, and prevent you from getting into this situation.

You should also refer to your log files, they will contain lots of 
useful information, as well as details that you should post to the list 
so we can see what mess you have created....

Hope it helps..

Regards,
Adam

-- 
Adam Goryachev Website Managers www.websitemanagers.com.au

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