[DRBD-user] Postgres disk always inconsistent

[Cory Coager]

I have a two node cluster setup with Pacemaker and DRBD to run Postgres. 
  For whatever reason, drbd is almost always in an inconsistent state 
everyday multiple times a day doing a big sync.  Why is this happening?

Both nodes are Ubuntu 10.04.1 running drbd 8.3.7-1ubuntu2.1.

drbd status:
version: 8.3.7 (api:88/proto:86-91)
GIT-hash: ea9e28dbff98e331a62bcbcc63a6135808fe2917 build by root at node2, 
2010-10-04 11:05:44
m:res       cs          ro                 ds                     p 
mounted        fstype
...         sync'ed:    18.2%              (18424/22492)M
0:postgres  SyncSource  Primary/Secondary  UpToDate/Inconsistent  C 
/mnt/postgres  ext4


config:
common {
   protocol C;
}
resource postgres {
   startup {
     wfc-timeout 0;
     degr-wfc-timeout 120;
   }
   handlers {
     fence-peer "/usr/lib/drbd/crm-fence-peer.sh";
     after-resync-target "/usr/lib/drbd/crm-unfence-peer.sh";
     #split-brain "/usr/local/scripts/splitbrain.sh";
   }
   disk {
     fencing resource-only;
     on-io-error detach;
   }
   net {
     data-integrity-alg sha1;
     after-sb-0pri discard-younger-primary;
     after-sb-1pri discard-secondary;
     after-sb-2pri disconnect;
   }
   syncer {
     rate 125M;
     verify-alg sha1;
   }
   on node1 {
     device    /dev/drbd0;
     disk      /dev/cciss/c0d0p3;
     address   a.b.c.d:7789;
     meta-disk internal;
   }
   on node2 {
     device    /dev/drbd0;
     disk      /dev/cciss/c0d0p3;
     address   a.b.c.e:7789;
     meta-disk internal;
   }
}



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