take a look at thomaskrenn.com (if from europe), you can choose "proxmox compatible" there when configurating servers.
we use supermicro over decades and would never go back to dell, hpe or ibm (been there, done that)
not an expert but my thoughts:
5 of 6 down is never possible, you need a valid qorum that means 50%+1 up
if you heavily need storage high available in 3 dc areas, you better invest a little bit more
(then you rarly get the 5/6 situation)
if I imagine the bandwith costs between east-west (is...
the installscript of fusionPBX installs a bunch of software. e.g. nginx, php etc and compiles freeswitch from source. take a look at the install script and remove these programms (apt remove or apt purge). remove freeswitch and it systemd units than install pve again. i guess nothing is lost...
its all Linux?
if yes you can migrate with nearly zero downtime by just using rsync and some scripting.
we "once" migrated from xen to kvm did it that way. it takes time but no downtime
i'd prefere redundancy. migrations are done rarly, so 95% of the time the bond would be used for storage only.
depends on your situation but we dont do any network without redundant link
i'd definitly go for bonding the 2 x 10gbs interfaces and run vmmigration etc and storage in vlans within. 2 x 1gbs for corosync, 2 x 1gbs bonding for non speed relevant vlans, uplinks, etc
30 nodes is not that much. even we as a small company have had problems with this limi5s, resulting in operating several clusters.
this is one of the biggest disadvanteges of proxmox in my opinon.
besides the 10y thing :) these are 2 completely different concepts I guess. op didnt show any details but sounds like a firewall infront of the network vs host based firewalling
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