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One time I was setting up a jboss cluster on vmware boxes - two right next to each other in the rack. JBoss used (uses?) multicast discovery to find the cluster
by liveoneggs 1y ago
One time I was setting up a jboss cluster on vmware boxes - two right next to each other in the rack. JBoss used (uses?) multicast discovery to find the cluster and the VMs on different boxes just couldn't find each other.
Another time I had a backup job using uftp (a multicast file xfer tool) and it was a similar story. Systems literally sitting one rack over couldn't talk.
We involved all of our CC*-certified guys, wasted a week, and eventually just used the explicit command line switches to configure the cluster.
The hardware is not up to the task, physical or virtual, as far as I can tell.
- belter 1y agoYou were probably using Arista... "...Cut through mode reduces switch latency at the risk of decreased reliability. Packet transmissions can begin immediately after the destination address is processed. Corrupted frames may be forwarded because packet transmissions begin before CRC bytes are received..." https://www.arista.com/en/um-eos/eos-data-transfer?searchword=eos+section+44+3+configuring+lanz https://www.arista.com/en/um-eos/eos-data-transfer?searchwor...
- liveoneggs 1y agoone case was definitely junipers
- ta1243 1y agoMulticast in a VM world can be very tricky, with multiple options all bad in different ways. https://archive.fosdem.org/2023/schedule/event/om_virt/attachments/slides/5615/export/events/attachments/om_virt/slides/5615/SRIOV.pdf https://archive.fosdem.org/2023/schedule/event/om_virt/attac...