Hi!

I have a dual-primary DRBD that is not working well: It was working, then I 
shut it down and restarted it. DRBD complained about split brain and fenced the 
other node. When coming up, the other node fenced this node. IMHO no node 
should have fenced each other.

Here are the logs from both nodes, restricted to DRBD:

Dec 20 14:22:01 h06 kernel: [339936.743323] block drbd0: Starting worker thread 
(from cqueue [13353])
Dec 20 14:22:01 h06 kernel: [339936.743452] block drbd0: disk( Diskless -> 
Attaching )
Dec 20 14:22:01 h06 kernel: [339936.767174] block drbd0: Found 4 transactions 
(6 active extents) in activity log.
Dec 20 14:22:01 h06 kernel: [339936.767178] block drbd0: Method to ensure write 
ordering: barrier
Dec 20 14:22:01 h06 kernel: [339936.767185] block drbd0: drbd_bm_resize called 
with capacity == 1048472
Dec 20 14:22:01 h06 kernel: [339936.767194] block drbd0: resync bitmap: 
bits=131059 words=2048 pages=4
Dec 20 14:22:01 h06 kernel: [339936.767197] block drbd0: size = 512 MB (524236 
KB)
Dec 20 14:22:01 h06 kernel: [339936.773015] block drbd0: bitmap READ of 4 pages 
took 2 jiffies
Dec 20 14:22:01 h06 kernel: [339936.773032] block drbd0: recounting of set bits 
took additional 0 jiffies
Dec 20 14:22:01 h06 kernel: [339936.773035] block drbd0: 0 KB (0 bits) marked 
out-of-sync by on disk bit-map.
Dec 20 14:22:01 h06 kernel: [339936.773041] block drbd0: disk( Attaching -> 
UpToDate )
Dec 20 14:22:01 h06 kernel: [339936.773045] block drbd0: attached to UUIDs 
8344B9D0C389D2DC:0000000000000000:902F198E803AB8E3:902E198E803AB8E3
Dec 20 14:22:01 h06 kernel: [339936.795343] block drbd0: conn( StandAlone -> 
Unconnected )
Dec 20 14:22:01 h06 kernel: [339936.795395] block drbd0: Starting receiver 
thread (from drbd0_worker [10322])
Dec 20 14:22:01 h06 kernel: [339936.795452] block drbd0: receiver (re)started
Dec 20 14:22:01 h06 kernel: [339936.795458] block drbd0: conn( Unconnected -> 
WFConnection )
Dec 20 14:22:02 h06 kernel: [339937.490329] block drbd0: role( Secondary -> 
Primary )
Dec 20 14:22:02 h06 kernel: [339937.490583] block drbd0: new current UUID 
B95131C56A7C2935:8344B9D0C389D2DC:902F198E803AB8E3:902E198E803AB8E3
Dec 20 14:22:02 h06 multipathd: drbd0: update path write_protect to '0' (uevent)
Dec 20 14:22:02 h06 kernel: [339937.537270] block drbd0: Handshake successful: 
Agreed network protocol version 96
Dec 20 14:22:02 h06 kernel: [339937.537278] block drbd0: conn( WFConnection -> 
WFReportParams )
Dec 20 14:22:02 h06 kernel: [339937.537335] block drbd0: Starting asender 
thread (from drbd0_receiver [10344])
Dec 20 14:22:02 h06 kernel: [339937.537725] block drbd0: data-integrity-alg: 
<not-used>
Dec 20 14:22:02 h06 kernel: [339937.543391] block drbd0: drbd_sync_handshake:
Dec 20 14:22:02 h06 kernel: [339937.543394] block drbd0: self 
B95131C56A7C2935:8344B9D0C389D2DC:902F198E803AB8E3:902E198E803AB8E3 bits:0 
flags:
0
Dec 20 14:22:02 h06 kernel: [339937.543397] block drbd0: peer 
3778E40F06BD4779:8344B9D0C389D2DC:902F198E803AB8E2:902E198E803AB8E3 bits:0 
flags:
0
Dec 20 14:22:02 h06 kernel: [339937.543399] block drbd0: uuid_compare()=100 by 
rule 90
Dec 20 14:22:02 h06 kernel: [339937.543403] block drbd0: helper command: 
/sbin/drbdadm initial-split-brain minor-0
Dec 20 14:22:02 h06 kernel: [339937.546011] block drbd0: helper command: 
/sbin/drbdadm initial-split-brain minor-0 exit code 0 (0x0)
Dec 20 14:22:02 h06 kernel: [339937.546015] block drbd0: Split-Brain detected 
but unresolved, dropping connection!
Dec 20 14:22:02 h06 kernel: [339937.546018] block drbd0: helper command: 
/sbin/drbdadm split-brain minor-0
Dec 20 14:22:02 h06 kernel: [339937.551050] block drbd0: meta connection shut 
down by peer.
Dec 20 14:22:02 h06 kernel: [339937.551056] block drbd0: conn( WFReportParams 
-> NetworkFailure )
Dec 20 14:22:02 h06 kernel: [339937.551065] block drbd0: asender terminated
Dec 20 14:22:02 h06 kernel: [339937.551067] block drbd0: Terminating asender 
thread
Dec 20 14:22:02 h06 kernel: [339937.586136] block drbd0: helper command: 
/sbin/drbdadm split-brain minor-0 exit code 0 (0x0)
Dec 20 14:22:02 h06 kernel: [339937.586146] block drbd0: conn( NetworkFailure 
-> Disconnecting )
Dec 20 14:22:02 h06 kernel: [339937.586152] block drbd0: error receiving 
ReportState, l: 4!
Dec 20 14:22:02 h06 kernel: [339937.586211] block drbd0: Connection closed
Dec 20 14:22:02 h06 kernel: [339937.586217] block drbd0: conn( Disconnecting -> 
StandAlone )
Dec 20 14:22:02 h06 kernel: [339937.586379] block drbd0: receiver terminated
Dec 20 14:22:02 h06 kernel: [339937.586381] block drbd0: Terminating receiver 
thread

### Node was fenced by other node ####

Dec 20 14:32:29 h06 kernel: [   82.661133] drbd: initialized. Version: 8.3.11 
(api:88/proto:86-96)
Dec 20 14:32:29 h06 kernel: [   82.661137] drbd: GIT-hash: 
0de839cee13a4160eed6037c4bddd066645e23c5 build by phil@fat-tyre, 2011-06-29 
11:37:11
Dec 20 14:32:29 h06 kernel: [   82.661140] drbd: registered as block device 
major 147
Dec 20 14:32:29 h06 kernel: [   82.661142] drbd: minor_table @ 
0xffff881fe93aec80
Dec 20 14:32:29 h06 multipathd: drbd0: add path (uevent)
Dec 20 14:32:29 h06 multipathd: drbd0: failed to get path uid
Dec 20 14:32:30 h06 kernel: [   83.726463] block drbd0: Starting worker thread 
(from cqueue [13371])
Dec 20 14:32:30 h06 kernel: [   83.726763] block drbd0: disk( Diskless -> 
Attaching )
Dec 20 14:32:30 h06 kernel: [   83.743970] block drbd0: Found 4 transactions (6 
active extents) in activity log.
Dec 20 14:32:30 h06 kernel: [   83.743974] block drbd0: Method to ensure write 
ordering: barrier
Dec 20 14:32:30 h06 kernel: [   83.743977] block drbd0: max BIO size = 131072
Dec 20 14:32:30 h06 kernel: [   83.743983] block drbd0: drbd_bm_resize called 
with capacity == 1048472
Dec 20 14:32:30 h06 kernel: [   83.743992] block drbd0: resync bitmap: 
bits=131059 words=2048 pages=4
Dec 20 14:32:30 h06 kernel: [   83.743995] block drbd0: size = 512 MB (524236 
KB)
Dec 20 14:32:30 h06 kernel: [   83.749884] block drbd0: bitmap READ of 4 pages 
took 2 jiffies
Dec 20 14:32:30 h06 kernel: [   83.749902] block drbd0: recounting of set bits 
took additional 0 jiffies
Dec 20 14:32:30 h06 kernel: [   83.749905] block drbd0: 0 KB (0 bits) marked 
out-of-sync by on disk bit-map.
Dec 20 14:32:30 h06 kernel: [   83.749910] block drbd0: Marked additional 16 MB 
as out-of-sync based on AL.
Dec 20 14:32:30 h06 kernel: [   83.749913] block drbd0: bitmap WRITE of 0 pages 
took 0 jiffies
Dec 20 14:32:30 h06 kernel: [   83.750053] block drbd0: 16 MB (4096 bits) 
marked out-of-sync by on disk bit-map.
Dec 20 14:32:30 h06 kernel: [   83.750060] block drbd0: disk( Attaching -> 
UpToDate )
Dec 20 14:32:30 h06 kernel: [   83.750063] block drbd0: attached to UUIDs 
B95131C56A7C2935:8344B9D0C389D2DC:902F198E803AB8E3:902E198E803AB8E3
Dec 20 14:32:30 h06 kernel: [   83.768968] block drbd0: conn( StandAlone -> 
Unconnected )
Dec 20 14:32:30 h06 kernel: [   83.768987] block drbd0: Starting receiver 
thread (from drbd0_worker [13662])
Dec 20 14:32:30 h06 kernel: [   83.769144] block drbd0: receiver (re)started
Dec 20 14:32:30 h06 kernel: [   83.769154] block drbd0: conn( Unconnected -> 
WFConnection )
Dec 20 14:32:31 h06 kernel: [   84.268286] block drbd0: Handshake successful: 
Agreed network protocol version 96
Dec 20 14:32:31 h06 kernel: [   84.268297] block drbd0: conn( WFConnection -> 
WFReportParams )
Dec 20 14:32:31 h06 kernel: [   84.268425] block drbd0: Starting asender thread 
(from drbd0_receiver [13681])
Dec 20 14:32:31 h06 kernel: [   84.268636] block drbd0: data-integrity-alg: 
<not-used>
Dec 20 14:32:31 h06 kernel: [   84.268828] block drbd0: drbd_sync_handshake:
Dec 20 14:32:31 h06 kernel: [   84.268833] block drbd0: self 
B95131C56A7C2934:8344B9D0C389D2DC:902F198E803AB8E3:902E198E803AB8E3 bits:4096 
flag
s:0
Dec 20 14:32:31 h06 kernel: [   84.268837] block drbd0: peer 
3778E40F06BD4779:8344B9D0C389D2DC:902F198E803AB8E2:902E198E803AB8E3 bits:8 
flags:0
Dec 20 14:32:31 h06 kernel: [   84.268841] block drbd0: uuid_compare()=100 by 
rule 90
Dec 20 14:32:31 h06 kernel: [   84.268846] block drbd0: helper command: 
/sbin/drbdadm initial-split-brain minor-0
Dec 20 14:32:31 h06 kernel: [   84.271076] block drbd0: helper command: 
/sbin/drbdadm initial-split-brain minor-0 exit code 0 (0x0)
Dec 20 14:32:31 h06 kernel: [   84.271081] block drbd0: Split-Brain detected, 1 
primaries, automatically solved. Sync from peer node
Dec 20 14:32:31 h06 kernel: [   84.271089] block drbd0: peer( Unknown -> 
Primary ) conn( WFReportParams -> WFBitMapT ) disk( UpToDate -> Outdated ) 
pdsk( DUnknown -> UpToDate)

### other node was fenced ####

Dec 20 14:32:41 h06 kernel: [   94.768068] block drbd0: PingAck did not arrive 
in time.
Dec 20 14:32:41 h06 kernel: [   94.768078] block drbd0: peer( Primary -> 
Unknown ) conn( WFBitMapT -> NetworkFailure ) pdsk( UpToDate -> DUnknown )
Dec 20 14:32:41 h06 kernel: [   94.768161] block drbd0: bitmap WRITE of 0 pages 
took 0 jiffies
Dec 20 14:32:41 h06 kernel: [   94.768379] block drbd0: asender terminated
Dec 20 14:32:41 h06 kernel: [   94.768384] block drbd0: 16 MB (4096 bits) 
marked out-of-sync by on disk bit-map.
Dec 20 14:32:41 h06 kernel: [   94.768394] block drbd0: Terminating asender 
thread
Dec 20 14:32:41 h06 kernel: [   94.768616] block drbd0: Connection closed


The other node:
Dec 20 14:22:01 h02 kernel: [340315.613659] block drbd0: Starting worker thread 
(from cqueue [13627])
Dec 20 14:22:01 h02 kernel: [340315.614016] block drbd0: disk( Diskless -> 
Attaching )
Dec 20 14:22:01 h02 kernel: [340315.681269] block drbd0: Found 4 transactions 
(55 active extents) in activity log.
Dec 20 14:22:01 h02 kernel: [340315.681273] block drbd0: Method to ensure write 
ordering: barrier
Dec 20 14:22:01 h02 kernel: [340315.681281] block drbd0: drbd_bm_resize called 
with capacity == 1048472
Dec 20 14:22:01 h02 kernel: [340315.681289] block drbd0: resync bitmap: 
bits=131059 words=2048 pages=4
Dec 20 14:22:01 h02 kernel: [340315.681292] block drbd0: size = 512 MB (524236 
KB)
Dec 20 14:22:01 h02 kernel: [340315.687209] block drbd0: bitmap READ of 4 pages 
took 1 jiffies
Dec 20 14:22:01 h02 kernel: [340315.687227] block drbd0: recounting of set bits 
took additional 0 jiffies
Dec 20 14:22:01 h02 kernel: [340315.687230] block drbd0: 0 KB (0 bits) marked 
out-of-sync by on disk bit-map.
Dec 20 14:22:01 h02 kernel: [340315.687235] block drbd0: disk( Attaching -> 
UpToDate )
Dec 20 14:22:01 h02 kernel: [340315.687239] block drbd0: attached to UUIDs 
8344B9D0C389D2DC:0000000000000000:902F198E803AB8E2:902E198E803AB8E3
Dec 20 14:22:01 h02 kernel: [340315.703404] block drbd0: conn( StandAlone -> 
Unconnected )
Dec 20 14:22:01 h02 kernel: [340315.703448] block drbd0: Starting receiver 
thread (from drbd0_worker [27349])
Dec 20 14:22:01 h02 kernel: [340315.703535] block drbd0: receiver (re)started
Dec 20 14:22:01 h02 kernel: [340315.703543] block drbd0: conn( Unconnected -> 
WFConnection )
Dec 20 14:22:02 h02 kernel: [340316.360240] block drbd0: role( Secondary -> 
Primary )
Dec 20 14:22:02 h02 kernel: [340316.360532] block drbd0: new current UUID 
3778E40F06BD4779:8344B9D0C389D2DC:902F198E803AB8E2:902E198E803AB8E3
Dec 20 14:22:02 h02 kernel: [340316.405852] block drbd0: Handshake successful: 
Agreed network protocol version 96
Dec 20 14:22:02 h02 kernel: [340316.405859] block drbd0: conn( WFConnection -> 
WFReportParams )
Dec 20 14:22:02 h02 kernel: [340316.406014] block drbd0: Starting asender 
thread (from drbd0_receiver [27371])
Dec 20 14:22:02 h02 kernel: [340316.406153] block drbd0: data-integrity-alg: 
<not-used>
Dec 20 14:22:02 h02 kernel: [340316.409149] block drbd0: drbd_sync_handshake:
Dec 20 14:22:02 h02 kernel: [340316.409153] block drbd0: self 
3778E40F06BD4779:8344B9D0C389D2DC:902F198E803AB8E2:902E198E803AB8E3 bits:0 
flags:0
Dec 20 14:22:02 h02 kernel: [340316.409157] block drbd0: peer 
B95131C56A7C2935:8344B9D0C389D2DC:902F198E803AB8E3:902E198E803AB8E3 bits:0 
flags:0
Dec 20 14:22:02 h02 kernel: [340316.409161] block drbd0: uuid_compare()=100 by 
rule 90
Dec 20 14:22:02 h02 kernel: [340316.409166] block drbd0: helper command: 
/sbin/drbdadm initial-split-brain minor-0
Dec 20 14:22:02 h02 kernel: [340316.411198] block drbd0: helper command: 
/sbin/drbdadm initial-split-brain minor-0 exit code 0 (0x0)
Dec 20 14:22:02 h02 kernel: [340316.411202] block drbd0: Split-Brain detected 
but unresolved, dropping connection!
Dec 20 14:22:02 h02 kernel: [340316.411206] block drbd0: helper command: 
/sbin/drbdadm split-brain minor-0
Dec 20 14:22:02 h02 multipathd: drbd0: update path write_protect to '0' (uevent)
Dec 20 14:22:02 h02 kernel: [340316.419274] block drbd0: helper command: 
/sbin/drbdadm split-brain minor-0 exit code 0 (0x0)
Dec 20 14:22:02 h02 kernel: [340316.419280] block drbd0: conn( WFReportParams 
-> Disconnecting )


### other node was fenced ###

Dec 20 14:22:02 h02 kernel: [340316.419287] block drbd0: error receiving 
ReportState, l: 4!
Dec 20 14:22:02 h02 kernel: [340316.419390] block drbd0: asender terminated
Dec 20 14:22:02 h02 kernel: [340316.419396] block drbd0: Terminating asender 
thread
Dec 20 14:22:02 h02 kernel: [340316.419487] block drbd0: Connection closed
Dec 20 14:22:02 h02 kernel: [340316.419493] block drbd0: conn( Disconnecting -> 
StandAlone )
Dec 20 14:22:02 h02 kernel: [340316.419510] block drbd0: receiver terminated
Dec 20 14:22:02 h02 kernel: [340316.419512] block drbd0: Terminating receiver 
thread
Dec 20 14:32:21 h02 kernel: [340935.071481] block drbd0: conn( StandAlone -> 
Unconnected )
Dec 20 14:32:21 h02 kernel: [340935.071526] block drbd0: Starting receiver 
thread (from drbd0_worker [27349])
Dec 20 14:32:21 h02 kernel: [340935.071679] block drbd0: receiver (re)started
Dec 20 14:32:21 h02 kernel: [340935.071687] block drbd0: conn( Unconnected -> 
WFConnection )

### this node was fenced ###

Dec 20 14:38:51 h02 kernel: [   81.985090] drbd: initialized. Version: 8.3.11 
(api:88/proto:86-96)
Dec 20 14:38:51 h02 kernel: [   81.985094] drbd: GIT-hash: 
0de839cee13a4160eed6037c4bddd066645e23c5 build by phil@fat-tyre, 2011-06-29 
11:37:11
Dec 20 14:38:51 h02 kernel: [   81.985096] drbd: registered as block device 
major 147
Dec 20 14:38:51 h02 kernel: [   81.985098] drbd: minor_table @ 
0xffff881fe87af180
Dec 20 14:38:51 h02 multipathd: drbd0: add path (uevent)
Dec 20 14:38:51 h02 multipathd: drbd0: failed to get path uid
Dec 20 14:38:52 h02 kernel: [   83.045961] block drbd0: Starting worker thread 
(from cqueue [13576])
Dec 20 14:38:52 h02 kernel: [   83.046260] block drbd0: disk( Diskless -> 
Attaching )
Dec 20 14:38:52 h02 kernel: [   83.064193] block drbd0: Found 4 transactions 
(55 active extents) in activity log.
Dec 20 14:38:52 h02 kernel: [   83.064197] block drbd0: Method to ensure write 
ordering: barrier
Dec 20 14:38:52 h02 kernel: [   83.064200] block drbd0: max BIO size = 131072
Dec 20 14:38:52 h02 kernel: [   83.064206] block drbd0: drbd_bm_resize called 
with capacity == 1048472
Dec 20 14:38:52 h02 kernel: [   83.064215] block drbd0: resync bitmap: 
bits=131059 words=2048 pages=4
Dec 20 14:38:52 h02 kernel: [   83.064218] block drbd0: size = 512 MB (524236 
KB)
Dec 20 14:38:52 h02 kernel: [   83.070075] block drbd0: bitmap READ of 4 pages 
took 1 jiffies
Dec 20 14:38:52 h02 kernel: [   83.070093] block drbd0: recounting of set bits 
took additional 0 jiffies
Dec 20 14:38:52 h02 kernel: [   83.070096] block drbd0: 0 KB (0 bits) marked 
out-of-sync by on disk bit-map.
Dec 20 14:38:52 h02 kernel: [   83.070109] block drbd0: Marked additional 192 
MB as out-of-sync based on AL.
Dec 20 14:38:52 h02 kernel: [   83.070112] block drbd0: bitmap WRITE of 0 pages 
took 0 jiffies
Dec 20 14:38:52 h02 kernel: [   83.070239] block drbd0: 192 MB (49139 bits) 
marked out-of-sync by on disk bit-map.
Dec 20 14:38:52 h02 kernel: [   83.070245] block drbd0: disk( Attaching -> 
UpToDate )
Dec 20 14:38:52 h02 kernel: [   83.070249] block drbd0: attached to UUIDs 
3778E40F06BD4779:8344B9D0C389D2DC:902F198E803AB8E2:902E198E803AB8E3
Dec 20 14:38:52 h02 kernel: [   83.088979] block drbd0: conn( StandAlone -> 
Unconnected )
Dec 20 14:38:52 h02 kernel: [   83.088995] block drbd0: Starting receiver 
thread (from drbd0_worker [13878])
Dec 20 14:38:52 h02 kernel: [   83.089044] block drbd0: receiver (re)started
Dec 20 14:38:52 h02 kernel: [   83.089053] block drbd0: conn( Unconnected -> 
WFConnection )
Dec 20 14:38:53 h02 kernel: [   83.588830] block drbd0: Handshake successful: 
Agreed network protocol version 96
Dec 20 14:38:53 h02 kernel: [   83.588842] block drbd0: conn( WFConnection -> 
WFReportParams )
Dec 20 14:38:53 h02 kernel: [   83.588972] block drbd0: Starting asender thread 
(from drbd0_receiver [13901])
Dec 20 14:38:53 h02 kernel: [   83.589219] block drbd0: data-integrity-alg: 
<not-used>
Dec 20 14:38:53 h02 kernel: [   83.589447] block drbd0: drbd_sync_handshake:
Dec 20 14:38:53 h02 kernel: [   83.589452] block drbd0: self 
3778E40F06BD4778:8344B9D0C389D2DC:902F198E803AB8E2:902E198E803AB8E3 bits:49139 
flags:0
Dec 20 14:38:53 h02 kernel: [   83.589456] block drbd0: peer 
B95131C56A7C2934:8344B9D0C389D2DC:902F198E803AB8E3:902E198E803AB8E3 bits:0 
flags:2
Dec 20 14:38:53 h02 kernel: [   83.589459] block drbd0: uuid_compare()=100 by 
rule 90
Dec 20 14:38:53 h02 kernel: [   83.589465] block drbd0: helper command: 
/sbin/drbdadm initial-split-brain minor-0
Dec 20 14:38:53 h02 kernel: [   83.591700] block drbd0: helper command: 
/sbin/drbdadm initial-split-brain minor-0 exit code 0 (0x0)
Dec 20 14:38:53 h02 kernel: [   83.591706] block drbd0: Split-Brain detected, 0 
primaries, automatically solved. Sync from this node
Dec 20 14:38:53 h02 kernel: [   83.591714] block drbd0: peer( Unknown -> 
Secondary ) conn( WFReportParams -> WFBitMapS ) pdsk( DUnknown -> Consistent )
Dec 20 14:38:53 h02 kernel: [   83.593414] block drbd0: helper command: 
/sbin/drbdadm before-resync-source minor-0
Dec 20 14:38:53 h02 kernel: [   83.595099] block drbd0: helper command: 
/sbin/drbdadm before-resync-source minor-0 exit code 0 (0x0)
Dec 20 14:38:53 h02 kernel: [   83.595106] block drbd0: conn( WFBitMapS -> 
SyncSource ) pdsk( Consistent -> Inconsistent )
Dec 20 14:38:53 h02 kernel: [   83.595113] block drbd0: Began resync as 
SyncSource (will sync 196556 KB [49139 bits set]).
Dec 20 14:38:53 h02 kernel: [   83.595222] block drbd0: updated sync UUID 
3778E40F06BD4778:8345B9D0C389D2DC:8344B9D0C389D2DC:902F198E803AB8E2
Dec 20 14:39:14 h02 kernel: [  104.848088] block drbd0: role( Secondary -> 
Primary )
Dec 20 14:39:14 h02 multipathd: drbd0: update path write_protect to '0' (uevent)
Dec 20 14:39:18 h02 kernel: [  109.167582] block drbd0: Resync done (total 25 
sec; paused 0 sec; 7860 K/sec)
Dec 20 14:39:18 h02 kernel: [  109.167588] block drbd0: updated UUIDs 
3778E40F06BD4779:0000000000000000:8345B9D0C389D2DC:8344B9D0C389D2DC
Dec 20 14:39:18 h02 kernel: [  109.167596] block drbd0: conn( SyncSource -> 
Connected ) pdsk( Inconsistent -> UpToDate )
Dec 20 14:39:18 h02 kernel: [  109.167722] block drbd0: bitmap WRITE of 0 pages 
took 0 jiffies
Dec 20 14:39:18 h02 kernel: [  109.167738] block drbd0: 0 KB (0 bits) marked 
out-of-sync by on disk bit-map.
Dec 20 14:39:44 h02 kernel: [  135.213231] block drbd0: peer( Secondary -> 
Primary )

I doubt that those "split brains were caused by a network connection problem at 
that times. What might be wrong? I always thought DRBD had production quality. 
Ist it a problem with the Cluster RAs?

The version used is this (SLES11 SP1):
# rpm -qf /usr/lib/ocf/resource.d/linbit/drbd
drbd-pacemaker-8.3.11-0.3.1


Regards,
Ulrich

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