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1 rpatters commented Permalink

We see incredible speeds now with the addition of 10Gb and Jumbo Frames. Right now though, we have an issue with RMC communication with the HMC. We can no longer do DLPAR operations. It seems that the HMC firewall is blocking the PMTU discovery, but I can't find any way to let that traffic pass. Am I missing something?

2 rpatters commented Permalink

Enabling Jumbo Frames on HMC resolved the issue:
chhmc -c network -s modify -i <interface> --jumboframe on</interface>

3 AnthonyEnglish commented Permalink

Thanks for your comments. The jumbo frames on the HMC is particularly interesting. As for the NIM and tftp, we'll have to accept this limitation and follow the official advice from IBM. Glad to know of it, though. Thank you.