[DRBD-user] problems with fsck on a drbd device

[j sattler]

hi all,

after restarting a cluster that is running heartbeat and drbd i found 
the following
system message rigth after mounting the drbd device:

---------------------------------------------------------------------
EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended
---------------------------------------------------------------------

after umounting the drbd devic and doing a
fsck /dev/drbd0
i got the following message:

---------------------------------------------------------------------
fsck 1.35 (28-Feb-2004)
e2fsck 1.35 (28-Feb-2004)
/dev/drbd0: i.O., 1310/3728256 Dateien, 262988/7447497 Blöcke
---------------------------------------------------------------------

when doing a
fsck -n /dev/drbd0
while the filesystem is mounted i get the following messages:
---------------------------------------------------------------------
fsck 1.35 (28-Feb-2004)
e2fsck 1.35 (28-Feb-2004)
Warnung!  /dev/drbd0 ist eingehängt.
/dev/drbd0 wurde nicht ordnungsgemäß ausgehängt, Prüfung erzwungen.
Durchgang 1: Prüfe Inodes, Blocks, und Größen
Inode 948427, i_Blocks ist 64, sollte sein 8.  Repariere? nein
Durchgang 2: Prüfe Verzeichnis Struktur
Durchgang 3: Prüfe Verzeichnis Verknüpfungen
Durchgang 4: Überprüfe die Referenzzähler
Durchgang 5: Überprüfe Gruppe Zusammenfassung
Block Bitmap differieren:  -(1906210--1906216)
Repariere? nein
/dev/drbd0: ********** WARNUNG: Noch Fehler im Dateisystem  **********
/dev/drbd0: 1312/3728256 Dateien (0.5% nicht zusammenhängend), 
262997/7447497 Blöcke
---------------------------------------------------------------------

i created the filesystem (with drbd running on both nodes)
entering the following command on the primary node:

mkfs -t ext2 /dev/drbd0

my drbd.conf is following:

resource r0 {

protocol C;
incon-degr-cmd "echo '!DRBD! pri on incon-degr' | wall ; sleep 60 ; halt 
-f";

startup {
   degr-wfc-timeout 120;    # 2 minutes.
}
syncer {
   rate 60M;
   group 1;
   al-extents 257;
 }
on linux05-ma {
   device     /dev/drbd0;
   disk       /dev/sda4;
   address    192.168.1.121:7788;
   meta-disk  internal;

 }
 on linux05-sl01 {
   device    /dev/drbd0;
   disk      /dev/sda4;
   address   192.168.1.122:7788;
   meta-disk internal;
 }
}

my system setup is following:

drbd version 0.7.6
debian sarge with linux kernel 2.4.28 running on two fujitsu-siemens 
tx200 boxes without scsi raid
drbd is connected over a twisted cable using the internal gig device of 
the boxes.

besides the fsck problem the system is running without troubles for 3 
weeks now.
did i do something wrong when setting up drbd?

any hints are welcome
thanks
johann sattler