@olivierlambert Just replying to keep on watching !

@olivierlambert awesome!

I assume Windows VMs that get their drivers from Windows Update will not have this capability unless we install the simple service:1727.

On github, it says that the the VM service has to respond within 1 minute, but it would take several minutes to backup a database. The blog page says it will wait for answer. Sounds like Vates knows the answer is somewhere in between. We will wait, but only for so long 🙂

Specification

XO will waits for the request to be answered before starting the snapshot, but will not wait longer than 1 minute.

If the request fails for any reason, XO will go ahead with snapshot immediately.

Webhooks for snapshots [beta] says "It's now possible to notify a VM via an HTTP request before a snapshot. Xen Orchestra will wait for an answer before starting the actual snapshot."

This is unconditional for a reason. The CSTATE errata in Nehalem are crippling - IIRC a core going in an out of a deep C state does not maintain cache coherency correctly, resulting in arbitrary memory corruption.

You really do care about not hitting this errata, even on a test/hobby server.

@splastunov said in Host CPU Statistics:

You can get it with such command

That command doesn't give me the aggregate, it only gives me the CPU for Dom0. I'd like to get that aggregate number.

@jbamford So yes no dynamic memory there. Perhjaps an issue with the Citrix guest tools but never seen this reported.

Hi,

If someone would build this, it should use Xen Orchestra API, as the central orchestrator, that would make most sense to do it that way 🙂

But yes, if someone want to start working on this, we'll be happy to assist on the API part 🙂

As you can see, the first alpha was not released in September 😉

Another XCP-ng pre-release will be done with vTPM, since there's more progress on upstream side (Citrix). When is hard to tell since it's not our call for this component 🙂

We always try to work with Citrix ("XenServer" division now), to push things upstream and manage to get it merged.

I don't know what CentOS 9 is like, I've never tested or installed it.
Centos 7 is quite stable, but over time it will fall behind, it only receives security updates.
To be able to install version 9 of Red Hat, Rocky Linux, CentOS, AlmaLinux, Oracle Linux, etc. ( Red Hat based OS ) you can use v8 templates.
For example, I use Rocky Linux 8 templates for VMs with Rocky Linux 9, but I also used Red Hat 8 template and it's ok.

@olivierlambert For now I am going to script it with 'xe vm-export" command. Also it would be good to be able to export to the server itself, instead of downloading to the client. My VMs are over 500Gigs

First alpha next week probably. Also consider 8.3 as a base for new stuff, not directly embedding a lot of new things for the official release 🙂 But since it won't be an LTS, it will be easier to make changes there!

@reinvtv said in NFS nconnect support:

As far as I understand it, this will give us multiple tcp streams over an LACP link, truely aggregating traffic on multiple interfaces. (Until now, you needed to use iSCSI multipathing for this, which isnt able to thin provision.).

You're neigher right nor wrong: LACP is more complex than just bundling NICs and in many cases it will NOT give you any benefit.
Why? Simple: For that you need to have NFS using multiple ports but stay with same MAC and IP, which means that your LACP balancing algo needs to be set (and support) L4.
Many just go L2 or L3 (means they decide on MAC or IP-Address).
As a quick search didn't answer me: If it even doesn't go that 'passive range' multiple port way: In typical environments it won't help you at all with LACP.

One might correct my post.

Also interesting: https://vastdata.com/blog/meet-your-need-for-speed-with-nfs/

I think you are oversimplifying how the storage is working in Xen 🙂 It's not KVM.

See https://xcp-ng.org/blog/2022/07/27/grant-table-in-xen/ for more details.

@Andrew I didn't say "Xen" I said XenServer.

virtIO in xen, now that would be great!

Hi,

Xen isn't Linux. When you boot on XCP-ng, you boot on Xen first, then the "control domain" will boot first (aka Dom0, aka what you think is the host but it's not).

This has to be implemented inside Xen, and I'm not sure that's the case. Let me ask around.

Thanks a lot for your answer.
I installed it on the XCP-NG host, and it works, but I do not claim that it works without errors, since I did not check the logs.

Hi,

This will be the case at some point, and it shouldn't be too difficult. We have the will to be able to provide a "cutting edge" version for people who want to play with fire 🙂