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<p class="MsoNormal">Hello,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I have over 10 sites in production with exactly the same standard M/S installation :<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> 2 Nodes (server1 and server2)
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:35.4pt"><span lang="EN-US">Debian 3.2.68-1+deb7u2 x86_64 GNU/Linux<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:35.4pt"><span lang="EN-US">DrbD 8.3.11 (api:88/proto:86-96)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:35.4pt"><span lang="EN-US">Corosync 1.4.2-3<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">All sites are exactly identic because we deploy them with an automatic installation DVD built with SimpleCDD.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We have a serious problem on 1 site, sometimes, the MASTER node switch from server1 to server2 with no reason, and return back to server1. Sometimes the system toggle 2 or 3 times before return back to normal state.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">This issue is not periodic. Sometimes it’s happened after 2mounth of stability, or it can happened 15days after the last time.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">This situation is critical because it can happened that the toggle corrupts some data, this is reflected by MySQL tables marked as crashed. (and our software stops)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Could you help to determine the possible root causes why the cluster become instable ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I Suspected first the LAN but I done some tests in Labs, and when we make errors on the LAN we have in the log something like “conn( WFConnection -> NetworkFailure )”. It’s not the case in production site. LAN semms
to be OK.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Here is the production logs for server1 and server2 :<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Server1 :<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:15:13 server1 kernel: [3865117.570629] block drbd0: role( Primary -> Secondary )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:15:13 server1 kernel: [3865117.570661] block drbd0: bitmap WRITE of 0 pages took 0 jiffies<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:15:13 server1 kernel: [3865117.570671] block drbd0: 0 KB (0 bits) marked out-of-sync by on disk bit-map.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:15:14 server1 kernel: [3865117.842211] block drbd0: peer( Secondary -> Unknown ) conn( Connected -> Disconnecting ) pdsk( UpToDate -> DUnknown )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:15:14 server1 kernel: [3865117.842384] block drbd0: asender terminated<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:15:14 server1 kernel: [3865117.842389] block drbd0: Terminating drbd0_asender<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:15:14 server1 kernel: [3865117.842486] block drbd0: Connection closed<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:15:14 server1 kernel: [3865117.842504] block drbd0: conn( Disconnecting -> StandAlone )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:15:14 server1 kernel: [3865117.842587] block drbd0: receiver terminated<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:15:14 server1 kernel: [3865117.842591] block drbd0: Terminating drbd0_receiver<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:15:14 server1 kernel: [3865117.842595] block drbd0: disk( UpToDate -> Failed )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:15:14 server1 kernel: [3865117.842633] block drbd0: disk( Failed -> Diskless )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:15:14 server1 kernel: [3865117.842665] block drbd0: drbd_bm_resize called with capacity == 0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:15:14 server1 kernel: [3865117.842674] block drbd0: worker terminated<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:15:14 server1 kernel: [3865117.842678] block drbd0: Terminating drbd0_worker<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865265.972144] block drbd0: Starting worker thread (from drbdsetup [57250])<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865265.972269] block drbd0: disk( Diskless -> Attaching )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865265.975419] block drbd0: Found 4 transactions (192 active extents) in activity log.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865265.975426] block drbd0: Method to ensure write ordering: flush<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865265.975434] block drbd0: drbd_bm_resize called with capacity == 3948344<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865265.975459] block drbd0: resync bitmap: bits=493543 words=7712 pages=16<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865265.975464] block drbd0: size = 1928 MB (1974172 KB)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865265.975795] block drbd0: bitmap READ of 16 pages took 0 jiffies<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865265.975848] block drbd0: recounting of set bits took additional 0 jiffies<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865265.975853] block drbd0: 0 KB (0 bits) marked out-of-sync by on disk bit-map.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865265.975861] block drbd0: disk( Attaching -> UpToDate )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865265.975866] block drbd0: attached to UUIDs 089C9C45FDE4ABBC:0000000000000000:62F362153A7923B6:62F262153A7923B6<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865265.990736] block drbd0: conn( StandAlone -> Unconnected )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865265.990760] block drbd0: Starting receiver thread (from drbd0_worker [57251])<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865265.990899] block drbd0: receiver (re)started<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865265.990909] block drbd0: conn( Unconnected -> WFConnection )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.489465] block drbd0: Handshake successful: Agreed network protocol version 96<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.489795] block drbd0: Peer authenticated using 20 bytes of 'sha1' HMAC<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.489808] block drbd0: conn( WFConnection -> WFReportParams )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.489921] block drbd0: Starting asender thread (from drbd0_receiver [57283])<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.490137] block drbd0: data-integrity-alg: <not-used><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.490167] block drbd0: drbd_sync_handshake:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.490173] block drbd0: self 089C9C45FDE4ABBC:0000000000000000:62F362153A7923B6:62F262153A7923B6 bits:0 flags:0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.490178] block drbd0: peer 8FE26C139FB94071:089C9C45FDE4ABBC:62F362153A7923B6:62F262153A7923B6 bits:297 flags:0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.490183] block drbd0: uuid_compare()=-1 by rule 50<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.490193] block drbd0: peer( Unknown -> Primary ) conn( WFReportParams -> WFBitMapT ) disk( UpToDate -> Outdated ) pdsk( DUnknown -> UpToDate )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.492311] block drbd0: conn( WFBitMapT -> WFSyncUUID )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.496178] block drbd0: updated sync uuid 089D9C45FDE4ABBC:0000000000000000:62F362153A7923B6:62F262153A7923B6<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.496315] block drbd0: helper command: /sbin/drbdadm before-resync-target minor-0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.499086] block drbd0: helper command: /sbin/drbdadm before-resync-target minor-0 exit code 0 (0x0)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.499097] block drbd0: conn( WFSyncUUID -> SyncTarget ) disk( Outdated -> Inconsistent )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.499110] block drbd0: Began resync as SyncTarget (will sync 1188 KB [297 bits set]).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.558764] block drbd0: Resync done (total 1 sec; paused 0 sec; 1188 K/sec)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.558774] block drbd0: updated UUIDs 8FE26C139FB94070:0000000000000000:089D9C45FDE4ABBC:089C9C45FDE4ABBC<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.558782] block drbd0: conn( SyncTarget -> Connected ) disk( Inconsistent -> UpToDate )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.558838] block drbd0: helper command: /sbin/drbdadm after-resync-target minor-0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.561386] block drbd0: helper command: /sbin/drbdadm after-resync-target minor-0 exit code 0 (0x0)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.561574] block drbd0: bitmap WRITE of 10 pages took 0 jiffies<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:42 server1 kernel: [3865266.561583] block drbd0: 0 KB (0 bits) marked out-of-sync by on disk bit-map.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:49 server1 kernel: [3865273.492362] block drbd0: peer( Primary -> Secondary )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:50 server1 kernel: [3865273.759294] block drbd0: role( Secondary -> Primary )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:17:50 server1 kernel: [3865273.953401] EXT4-fs (drbd0): mounted filesystem with ordered data mode. Opts: (null)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Server2:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 06:47:02 server2 lpd[23019]: restarted<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:08:36 server2 kernel: [3865172.121119] block drbd0: peer( Primary -> Secondary )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:08:36 server2 kernel: [3865172.357331] block drbd0: peer( Secondary -> Unknown ) conn( Connected -> TearDown ) pdsk( UpToDate -> DUnknown )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:08:36 server2 kernel: [3865172.357554] block drbd0: asender terminated<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:08:36 server2 kernel: [3865172.357562] block drbd0: Terminating drbd0_asender<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:08:36 server2 kernel: [3865172.357739] block drbd0: Connection closed<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:08:36 server2 kernel: [3865172.357749] block drbd0: conn( TearDown -> Unconnected )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:08:36 server2 kernel: [3865172.357759] block drbd0: receiver terminated<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:08:36 server2 kernel: [3865172.357762] block drbd0: Restarting drbd0_receiver<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:08:36 server2 kernel: [3865172.357766] block drbd0: receiver (re)started<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:08:36 server2 kernel: [3865172.357771] block drbd0: conn( Unconnected -> WFConnection )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:08:36 server2 kernel: [3865172.601231] block drbd0: role( Secondary -> Primary )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:08:36 server2 kernel: [3865172.601432] block drbd0: new current UUID 8FE26C139FB94071:089C9C45FDE4ABBC:62F362153A7923B6:62F262153A7923B6<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:08:36 server2 kernel: [3865172.785933] EXT4-fs (drbd0): mounted filesystem with ordered data mode. Opts: (null)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.006344] block drbd0: Handshake successful: Agreed network protocol version 96<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.006741] block drbd0: Peer authenticated using 20 bytes of 'sha1' HMAC<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.006754] block drbd0: conn( WFConnection -> WFReportParams )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.006890] block drbd0: Starting asender thread (from drbd0_receiver [6537])<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.007160] block drbd0: data-integrity-alg: <not-used><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.007199] block drbd0: drbd_sync_handshake:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.007205] block drbd0: self 8FE26C139FB94071:089C9C45FDE4ABBC:62F362153A7923B6:62F262153A7923B6 bits:297 flags:0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.007224] block drbd0: peer 089C9C45FDE4ABBC:0000000000000000:62F362153A7923B6:62F262153A7923B6 bits:0 flags:0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.007234] block drbd0: uuid_compare()=1 by rule 70<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.007244] block drbd0: peer( Unknown -> Secondary ) conn( WFReportParams -> WFBitMapS ) pdsk( DUnknown -> Consistent )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.010000] block drbd0: helper command: /sbin/drbdadm before-resync-source minor-0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.012921] block drbd0: helper command: /sbin/drbdadm before-resync-source minor-0 exit code 0 (0x0)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.012932] block drbd0: conn( WFBitMapS -> SyncSource ) pdsk( Consistent -> Inconsistent )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.012942] block drbd0: Began resync as SyncSource (will sync 1188 KB [297 bits set]).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.012958] block drbd0: updated sync UUID 8FE26C139FB94071:089D9C45FDE4ABBC:089C9C45FDE4ABBC:62F362153A7923B6<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.076076] block drbd0: Resync done (total 1 sec; paused 0 sec; 1188 K/sec)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.076086] block drbd0: updated UUIDs 8FE26C139FB94071:0000000000000000:089D9C45FDE4ABBC:089C9C45FDE4ABBC<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.076096] block drbd0: conn( SyncSource -> Connected ) pdsk( Inconsistent -> UpToDate )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.076342] block drbd0: bitmap WRITE of 10 pages took 0 jiffies<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:05 server2 kernel: [3865321.076351] block drbd0: 0 KB (0 bits) marked out-of-sync by on disk bit-map.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:12 server2 kernel: [3865328.009119] block drbd0: role( Primary -> Secondary )
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:12 server2 kernel: [3865328.009190] block drbd0: bitmap WRITE of 0 pages took 0 jiffies<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:12 server2 kernel: [3865328.009202] block drbd0: 0 KB (0 bits) marked out-of-sync by on disk bit-map.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">May 1 08:11:12 server2 kernel: [3865328.276278] block drbd0: peer( Secondary -> Primary )<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks for your answers,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Benjamin Linier<o:p></o:p></span></p>
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