[DRBD-user] Unrelated data, aborting! after split brain

[Alex Kuehne]

Hi guys,

In order to prepare a DRBD cluster for production, I'm playing around  
with split brain scenarios. First test worked after instructions from  
http://www.drbd.org/users-guide/s-resolve-split-brain.html, but second  
test gives me that error after drbdadm connect:

kernel: block drbd1: uuid_compare()=-1000 by rule 100
kernel: block drbd1: Unrelated data, aborting!

I don't know why both nodes don't like each other anymore. I'm curios  
to understand what happened here.

Here are my data:

DRBD ver 8.3.10rc2

on split brain survivor:
# cat /proc/drbd
version: 8.3.10rc2 (api:88/proto:86-96)
GIT-hash: a38b219864715e807e785488d5907a273f54adb6 build by  
root at std11526-vm03, 2011-01-14 07:08:33

  1: cs:StandAlone ro:Primary/Unknown ds:UpToDate/DUnknown   r-----
     ns:0 nr:0 dw:222947 dr:2450 al:25 bm:29 lo:0 pe:0 ua:0 ap:0 ep:1  
wo:b oos:7988

on split brain victim:
# cat /proc/drbd
version: 8.3.10rc2 (api:88/proto:86-96)
GIT-hash: a38b219864715e807e785488d5907a273f54adb6 build by  
root at std11526-vm03, 2011-01-14 07:08:33

  1: cs:StandAlone ro:Secondary/Unknown ds:UpToDate/DUnknown   r-----
     ns:0 nr:0 dw:0 dr:208 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:0

My DRBD conf here: http://p.0wnz.at/205018, global_common.conf is used  
as shipped.

Here is where I suspect the problem:

kernel: block drbd1: drbd_sync_handshake:
kernel: block drbd1: self  
26B93DADD512C783:65ED83424EBC4E55:C1A7166A8B12AF84:C1A6166A8B12AF85  
bits:2166 flags:0
kernel: block drbd1: peer  
B2D0D9A2D3A1044E:52265F28809CCB48:0001000000000000:06947CB397C2C578  
bits:0 flags:1
kernel: block drbd1: uuid_compare()=-1000 by rule 100
kernel: block drbd1: Unrelated data, aborting!
kernel: block drbd1: conn( WFReportParams -> Disconnecting )

So what can I do to get both nodes to sync again, without having to  
recreate the whole mirror?

Best regards,
Alex Kuehne