I ran into an interesting issue last night when I tried to add a second storage interface. The original 10gb storage interface on the OSD node was only set at 1500 MTU, so the plan was to bump it to 9000 and configure the second interface the same way with a diff IP and reboot. Once I did that, for some reason the original interface showed active but would not respond to ping from the other OSD nodes, the second interface I added came up and was reachable. So even though the node could still communicate to the others on the second interface, PG's would start remapping and would get stuck at about 300 (of 1024). I resolved the issue by changing the config back on the original interface and disabling the second. After a Reboot, PG's recovered very quickly.
It seemed that the remapping would only go partially because the first node could reach the others, but they couldn't reach the original interface and didn't use the newly added second. So for my questions:
Is there a proper way to add an additional interface (for redundancy) to the storage network so that it's recognized by the cluster?
If IPV6 is enabled on a storage interface when the cluster was created, would it be a problem to disable it now?
Cheers,
Mike
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