On Jan 12, 2011, at 3:12 PM, Jesse Becker wrote: > In light of the recent discussions over metadata and unicast vs. > multicast, we (meaning "Bernard") have created a poll on > http://ganglia.info/ to try and gauge the use of each. Please let us > know if you use multicast, unicast, or both in your environments. > > If you have any comments about using one or the other,
We used multicast for a long time because it's certainly easy, and ganglia is something multicast is well suited for. But as the years rolled on, firewalls got involved, people became concerned about memory and network usage, and subnet privacy was eroding. We started getting other departments' machines mixed in with our machines, and this caused all kinds of confusion on both sides. Migrating to unicast eliminated the firewall issues, means only a select few machines have to keep metrics in memory, and no more cross talk with other groups. I never saw any solid evidence that ganglia was putting an unfair load on systems, but it was easier to reconfigure than fight it. So the reasons to switch were mostly political. ------------------------------------------------------------------------------ Protect Your Site and Customers from Malware Attacks Learn about various malware tactics and how to avoid them. Understand malware threats, the impact they can have on your business, and how you can protect your company and customers by using code signing. http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ Ganglia-general mailing list Ganglia-general@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ganglia-general
