[DRBD-user] Dual-primary to single node

CAMPBELL Robert robert.campbell at morpho.com
Tue Jan 17 17:07:26 CET 2012

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Luis,

I have experienced the same problems, what helped was to 'fence' the 
other node by forcing it into a reboot. I don't quite know why it worked 
(worrying) but I found that if I fenced the other node, I was not 
getting any more time-outs on the drbd block device, which I think is 
what you describe.

I am using HP servers with iLO3 and RHEL/CentOS, so I used the 
fence_ipmi script included with the CentOS 6.1 distribution (do not 
forget to attach your fence devices to the correct nodes).

Hope it helps!

Robert

On 13-1-2012 10:59, Luis M. Carril wrote:
> Hello,
>
>    I´m new to DRBD and I think that I have a mess with some concepts 
> and policies.
>
>    I have setup a two node cluster (of virtual machines) with a shared 
> volume in dual primary mode with ocfs2 as a basic infrastructure for 
> some testings.
>    I need that when one of the two nodes goes down the other continues 
> working normally (we can assume that the other node never will recover 
> again), but when one node fails
>    the other enter in WFConnection state and the volume is 
> disconnected, I have setup the standar set of policies for split brain:
>
>     after-sb-0pri discard-zero-changes;
>     after-sb-1pri discard-secondary;
>     after-sb-2pri disconnect;
>
>
>   Which policy should I use to achieve the desired behaivour (if one 
> node fails, the other continue working alone)?
>
> Regards
>




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