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Re: [Linux-cluster] nodes boot synchronization sensitivity



anyway, still don't understand:

node1 of the two_nodes cluster boots up and becomes quorate. the other node2 is still down, so the fenced on node1 reports:

  Nov 19 10:11:41 node1 fenced[3559]: node2 not a
  cluster member after 6 sec post_join_delay
  Nov 19 10:11:41 node1 fenced[3559]: fencing node "node2"

and fences the node2. than node2 boots up and repeats the same scenario - I can't understand, why at this point the node2 can't just join the running cluster with node1 and instead of that reports the same "node1 not a cluster member after 6 sec" and fences it. this oscillates forever.

is this normal behavior?

thanks for advices.
stepan

Stepan Kadlec wrote:
oh, I have probably misunderstood the problem - the real cause seems be unsynchronized local clocks on the nodes...
    bye stepan


Stepan Kadlec wrote:
hello,
I have two_node cluster. If I synchronize the boot to the same time, both nodes join fain and everything works.

I am trying to make it less sensitive to boot-time synchronization (to accept at least two minutes difference) but the nodes never join and after some time, one node is fenced.

I have prolonged the post_join_delay to 120 seconds, but even when both nodes are trying to join in the nearly same time (~30 sec difference), they are unsuccessful - the log shows

    "not a cluster member after 120 sec post_join_delay"

and the other node is fenced.

I am running the cluster in following steps:

cman_tool -t 120 -w join -n node1 -c cluster
groupd
fenced
dlm_controld
gfs_controld
fence_tool -w -t 300 -m 20 join

how can I make the nodes less sensitive to boot synchronization?

thanks for your advices.
stepan

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