[Ocfs2-users] self fencing and system panic problem after forced reboot

[Holger Brueckner]

hello,

i'm running ocfs2 to provide a shared disk thoughout a xen cluster.
this setup was working fine until today where there was an power outage
and all xen nodes where forcefully shut down. whenever i try to
mount/access the ocfs2 partition the system panics and reboots: 

darks:~# fsck.ocfs2 -y -f /dev/sda4
(617,0):__dlm_print_nodes:377 Nodes in my domain
("5BA3969FC2714FFEAD66033486242B58"):
(617,0):__dlm_print_nodes:381  node 0
Checking OCFS2 filesystem in /dev/sda4:
  label:              <NONE>
  uuid:               5b a3 96 9f c2 71 4f fe ad 66 03 34 86 24 2b 58
  number of blocks:   35983584
  bytes per block:    4096
  number of clusters: 4497948
  bytes per cluster:  32768
  max slots:          4

/dev/sda4 was run with -f, check forced.
Pass 0a: Checking cluster allocation chains
Pass 0b: Checking inode allocation chains
Pass 0c: Checking extent block allocation chains
Pass 1: Checking inodes and blocks.
[CLUSTER_ALLOC_BIT] Cluster 295771 is marked in the global cluster
bitmap but it isn't in use.  Clear its bit in the bitmap? y
[CLUSTER_ALLOC_BIT] Cluster 2456870 is marked in the global cluster
bitmap but it isn't in use.  Clear its bit in the bitmap? y
[CLUSTER_ALLOC_BIT] Cluster 2683096 is marked in the global cluster
bitmap but it isn't in use.  Clear its bit in the bitmap? y
Pass 2: Checking directory entries.
Pass 3: Checking directory connectivity.
Pass 4a: checking for orphaned inodes
Pass 4b: Checking inodes link counts.
All passes succeeded.
darks:~# mount /data
(622,0):ocfs2_initialize_super:1326 max_slots for this device: 4
(622,0):ocfs2_fill_local_node_info:1019 I am node 0
(622,0):__dlm_print_nodes:377 Nodes in my domain
("5BA3969FC2714FFEAD66033486242B58"):
(622,0):__dlm_print_nodes:381  node 0
(622,0):ocfs2_find_slot:261 slot 2 is already allocated to this node!
(622,0):ocfs2_find_slot:267 taking node slot 2
(622,0):ocfs2_check_volume:1586 File system was not unmounted cleanly,
recovering volume.
kjournald starting.  Commit interval 5 seconds
ocfs2: Mounting device (8,4) on (node 0, slot 2) with ordered data mode.
(630,0):ocfs2_replay_journal:1181 Recovering node 2 from slot 0 on
device (8,4)
darks:~# (4,0):o2hb_write_timeout:164 ERROR: Heartbeat write timeout to
device sda4 after 12000 milliseconds
(4,0):o2hb_stop_all_regions:1789 ERROR: stopping heartbeat on all active
regions.
Kernel panic - not syncing: ocfs2 is very sorry to be fencing this
system by panicing

ocfs2-tools    1.2.1-1
kernel         2.6.16-xen (with corresponding ocfs2 compiled into the
               kernel)

i already tried the elevator=deadline scheduler option with no effect.
any further help debugging this issue is greatly appreciated. are ther
any other possibilities to get access to the data from outside the
cluster (obviously while the partition isn't mounted) ?

thanks for your help

holger brueckner



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