CD drive not completely installed in XOA

olivierlambert

This is normal until you got your first boot done It shouldn't cause any harm Consider this alert useless
So it seems you have your ISO SR correctly working
It should be mounted in /run/sr-mount/<SR UUID>. But ISO SR can be in read only, that's fine

So in the end, can you boot the VM with Ubuntu ISO?

ashinobi

Thanks for the information. In regards to your question the answer is no, if I ran VMGuest I get this error message:

NO_HOSTS_AVAILABLE()

This is a XenServer/XCP-ng error

That is why I thought the issue is the CD is not properly mounted. I only have 1 hypervisor and this is my first VMGuest.

Also, I am not sure if this will make any difference. I have the XOA installed on my desktop as a vmguest in my vmware workstation. Once I have finished setting up XCP-NG, I will create new image and move the XOA as vmguest of XCP-NG.

olivierlambert

NO_HOSTS_AVAILABLE() means there's no host able to start the VM. Can be for various reasons. Can you try to do a xe vm-start uuid=<VM UUID> from the host?

ashinobi

@olivierlambert

Thank you so much for the help.

Running the command the command "xe vm-start uuid=<VM UUID>" it indicated the following: "home-hypervisor: Cannot start here [Not enough free memory]

After seeing this I have double check my VMGuest configuration, and it is set to 4TiB instead of 4GiB. I have corrected this and the VM started running. Again thank you so much for responding.

olivierlambert

Good news then I'd love to get the error message coming in XO, but I'm not sure why we can't have the details.

Ping @julien-f on this: why NO_HOSTS_AVAILABLE() is just coming without any more content in XO? Is it a XAPI limitation? Why we have more info in xe?

julien-f

@olivierlambert No idea without investigating, all that I can tell is that this error comes straight from the XAPI without any more info.

julien-f

I just did a quick test and neither VM.start(ref, false, false) nor Async.VM.start(ref, false, false) (which creates a task) gives any more info.

olivierlambert

Got it @julien-f

If xe fails to boot the VM, it will call an extra function, doing a VM.assert_can_boot_here, and catching the failure to display it.

See https://github.com/xapi-project/xen-api/blob/47fae74032aa6ade0fc12e867c530eaf2a96bf75/ocaml/xapi-cli-server/cli_operations.ml#L3212 and https://github.com/xapi-project/xen-api/blob/47fae74032aa6ade0fc12e867c530eaf2a96bf75/ocaml/xapi-cli-server/cli_operations.ml#L2105

That would be an interesting XO feature

julien-f

@olivierlambert Nice, should be pretty easy to add! The only think I'm wondering is which host is it choosing to pass to assert_can_boot_here in case of a simple start on a multiple hosts pool.

olivierlambert

I had the exact same reaction

julien-f

From what I understand it appears to do it on all the hosts, which makes sense

olivierlambert

Indeed. So it's a pretty nice feature to have to enrich our logs. Is it possible to simply chain that in XO so we got the error with more details?

julien-f

@olivierlambert Done: https://github.com/vatesfr/xen-orchestra/commit/33b45d2eda2ce6d8071541da246bdcfd06b133b8

It's not perfect but that should help

Example:

vm.start
{
  "id": "123e4f2b-498e-d0af-15ae-f835a1e9f59f",
  "bypassMacAddressesCheck": false,
  "force": false
}
{
  "errors": [
    "R620-L3: VM_REQUIRES_SR(OpaqueRef:21fa00fc-62ce-4694-8b49-fcecd600a89e, OpaqueRef:4dd615a7-9a8c-4698-aceb-c10f782321c8)",
    "R620-L1: HOST_NOT_ENOUGH_FREE_MEMORY(216430280704, 18778341376)",
    "R620-L2: VM_REQUIRES_SR(OpaqueRef:21fa00fc-62ce-4694-8b49-fcecd600a89e, OpaqueRef:4dd615a7-9a8c-4698-aceb-c10f782321c8)"
  ],
  "message": "",
  "name": "Error",
  "stack": "Error: 
    at Xapi._startVm (file:///home/julien/dev/vatesfr/xen-orchestra/packages/xo-server/src/xapi/index.mjs:1358:15)
    at Xapi.startVm (file:///home/julien/dev/vatesfr/xen-orchestra/packages/xo-server/src/xapi/index.mjs:1393:7)
    at Api.callApiMethod (file:///home/julien/dev/vatesfr/xen-orchestra/packages/xo-server/src/xo-mixins/api.mjs:307:20)"
}

2

julien-f committed to vatesfr/xen-orchestra

feat(xo-server): better info when failing to start a VM

Fixes https://xcp-ng.org/forum/post/47329