Unable to add host to pool

[BradyS]

Hi, everyone! New to XCP-ng and first post to the forums.

I have two identically configured Dell R430 servers (same CPUs, same RAM, same drives) with fresh installs of XCP-ng release 8.2.1 xenenterprise (confirmed via more /etc/redhat-release). I've run yum updates on both servers and installed XOA on the primary but not the second. I've done nothing else to either machine (no other VMs, VIFs, SRs, etc.).

When I try to add the second host to the pool on the first, I'm getting an error:

pool.mergeInto
{
  "sources": [
    "54f63262-35d8-185b-47c0-cdf1616dceff"
  ],
  "target": "b364d553-ed7e-5685-d1fd-0ba10ea5fa2a",
  "force": true
}
{
  "message": "The hosts are not compatible",
  "name": "Error",
  "stack": "Error: The hosts are not compatible
    at Pools.mergeInto (file:///usr/local/lib/node_modules/xo-server/src/xo-mixins/pool.mjs:27:15)
    at Xo.mergeInto (/usr/local/lib/node_modules/xo-server/node_modules/lodash/_createBind.js:23:15)
    at Xo.mergeInto (file:///usr/local/lib/node_modules/xo-server/src/api/pool.mjs:289:15)
    at Api.#callApiMethod (file:///usr/local/lib/node_modules/xo-server/src/xo-mixins/api.mjs:306:20)"
} 

I can't find much info on that specific error.

I've read various posts here and elsewhere about adding hosts to pools without any luck. I'm looking for your help (and hoping I've overlooked something obvious).

Thanks!

[tjkreidl]

@BradyS Probably this is due to incompatible BIOS settings, such as C states, turbo mode, etc. Run "xe host-cpu-info" on each host to compare the two host settings. Also, make sure the firmware and update levels are all the same as those can also affect the CPU masks.