This is not a coherent shared disk environment. The iscsi target
has no idea that the device is also being updated from another
source.
On 03/02/2011 04:30 PM, Nikola Savic wrote:
Hello,
I have 3 node setup using CentOS 5.5 and OCFS2 1.4. Disks from two nodes
(node1 and node2) are connected using DRBD (primary/primary mode) and this
shared storage should be accessable from all three nodes. Because of that,
node1 has the iSCSI target setup on top the /dev/drbd1 device. I was also able
to format the shared storage using OCFS2.
When I mount OCFS2 disk on node1 and node2 using the /dev/drbd1 device, they
work well. After mounting it on node3 using the imported iSCSI /dev/sda device,
system gets into trouble. It looks like node3 can't join cluster and it's
heathbeating in slot taken by node1 or node2.
Similarly, when I import iSCSI target from node1 on node2, then node2 and
node3 work well, while mounting /dev/drbd1 on node1 makes hearthbeating
problem. When that happens, on node2 and node3 I get following line in
/var/log/messages:
/ node3 kernel: ocfs2_dlm: Nodes in domain
("72F96BF71A3A41B6BD5540CE773A9E9D"): 2 3/
while node1 reports:
/ node1 kernel: ocfs2_dlm: Nodes in domain
("72F96BF71A3A41B6BD5540CE773A9E9D"): 1
...
node1 kernel: (o2hb-72F96BF71A,2456,0):o2hb_do_disk_heartbeat:777 ERROR: Device
"drbd1": another node is heartbeating in our slot!/
I tried to setup iSCSI initiator on node1, so it can connect to own iSCSI
target, but it doesn't work.
Does anyone know why is this happening and how can I solve the problem? I
think everything worked well when I used GNBD to export DRBD device to third
node, but I would like to do it without RHCS.
Cluster configuration file (/etc/ocfs2/cluster.conf):
cluster:
node_count = 3
name = testcluster
node:
ip_port = 7777
ip_address = 192.168.100.2
number = 1
name = node1
cluster = testcluster
node:
ip_port = 7777
ip_address = 192.168.100.3
number = 2
name = node2
cluster = testcluster
node:
ip_port = 7777
ip_address = 192.168.100.4
number = 3
name = node3
cluster = testcluster
Thanks,
Nikola
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