Personally if i was to try and experiment with something non-default I
would try to use ospf+bfd either with bird or quagga.
-you get quick failovers due to bfd.
-you can equal cost multipath links to utillize multiple ports between
servers.
-All links are active, so you do not have a "passive" link, as you have
with STP
-and there is no needless duplication of data, so you do not get the 50%
bandwith loss of a broadcast bond.
-you need to use corosync with targeted udp towards spesific loopback
addresses.
-traffic goes shortest path. so allways towards the correct server.
- you can very easily expand beyond 3 nodes if you have enough ports. Or
move the ospf domain onto a switch if needed. this also easily converts
to a multiple switch config to maintain HA and no SPOF
Happy experimentation!
mvh
Ronny Aasen
On 11/22/18 7:29 PM, Frank Thommen wrote:
Please excuse, if this is too basic, but after reading
https://pve.proxmox.com/wiki/Cluster_Manager I wondered, if the
cluster/corosync network could be built by directly connected network
interfaces. I.e not like this:
+-------+
| pve01 |----------+
+-------+ |
|
+-------+ +----------------+
| pve02 |-----| network switch |
+-------+ +----------------+
|
+-------+ |
| pve03 |----------+
+-------+
but like this:
+-------+
| pve01 |---+
+-------+ |
| |
+-------+ |
| pve02 | |
+-------+ |
| |
+-------+ |
| pve03 |---+
+-------+
(all connections 1Gbit, there are currently not plans to extend over
three nodes)
I can't see any drawback in that solution. It would remove one layer of
hardware dependency and potential spof (the switch). If we don't trust
the interfaces, we might be able to configure a second network with the
three remaining interfaces.
Is such a "direct-connection" topology feasible? Recommended? Strictly
not recommended?
I am currently just planning and thinking and there is no cluster (or
even a PROXMOX server) in place.
Cheers
frank
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