- **status**: accepted --> fixed
- **Comment**:
commit 6b7874e4a47e46837c40c7d82c54c541793f6752
Author: Alex Jones <alex.jo...@genband.com>
Date: Wed Aug 9 09:36:08 2017 -0400
---
** [tickets:#2545] dtm: osafdtmd asserts and reboots node if node up is
received from known node**
**Status:** fixed
**Milestone:** 5.17.10
**Created:** Mon Aug 07, 2017 02:27 PM UTC by Alex Jones
**Last Updated:** Tue Aug 08, 2017 06:27 PM UTC
**Owner:** Alex Jones
Topology is two physical nodes, and 10-15 VMs on each physical node in a KVM
setup. OVS 2.7 is used as the bridging between the host and VMs on each
physical node. And OVN is used for internode networking between the two hosts,
using geneve tunnel. MTU on the physical tunnel ports is 1500 as are VM
interfaces.
You also need a fairly large IMM database.
This will ensure that 1500 byte packets will be sent from the controller during
IMM sync. Packets larger than 14xx bytes will be dropped by the tunnel,
resulting in missed packets on the other side.
When a node across the tunnel tries to come into the cluster, dtmd on this new
node will miss some packets because they are dropped by the tunnel (because MTU
is too large). This will cause dtmd on that node to assert and reboot
continuously. Thus, it never comes into the cluster.
Setting MTU of the tunnel to be 9000 (jumbo frames) makes this problem go away
because packets are no longer being dropped due to MTU size.
You could probably reproduce this without using any virtualization -- just
communication between nodes over a tunnel where the MTU across the path is less
than the MTU of the interfaces of the OpenSAF nodes themselves.
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