First, you need to check if it's a guest issue or not. Boot your failed restored VM with a live CD (Ubuntu or something else) and check if you can access the disks.

Thanks for the tips.
When I try to restore an individual file from the server using ZFS compression & dedupe XOA gives me an error: "Error while scanning disk"

I'm wondering if the compression or dedupe is the likely cause. My money is on the Deduplication. Any thoughts on this?

@olivierlambert said in Backup does not work if one host in the pool is offline:

When you connect to a working, machine, yes it does 🙂

But XAPI connection isn't persistent: it means, when the pool is disconnected, XO has no recollection whatsoever on who was the "real" master the last time it was connected. The only info we store is the IP address you entered in Settings/server.

I agree, functionally speaking, it can be limiting in your case. A viable option would be to save all existing hosts IPs in the XO database, as fallback if we can't connect to the IP you entered. This is not a very common case, that's why it wasn't done before 🙂

Looks like a good suggestion. Thanks.

In my case I migrated everything from the poolmaster to the second host, then changed the second host to pool master, waited an hour and then shut down the old pool master (now just a pool member). XOA was online during the entire process and I had forgotten to check the server list. 🙂

That's because the effort to change this will be taken into account in XO 6 🙂

Alternatively, you can indeed contribute, this will be very welcome!

Hi ! We are experiencing these kind of problems because we activated Continous Replication and frequency was way too low.

Now I want to eliminate all those files in the chain, can I do it manually from XCP-NG Center or XOA ?

Thanks !!!

c2aa1fb3-2ed2-41cf-b242-e2a23e6832e4-image.png

Ping @julien-f and/or @fohdeesha

@pdonias I did an update to Netbox 2.11.12 and it works now, so I don't need to tamper with my XOA.

Sure.

Do you know if it's our responsibility to create the repo or if it's within "upstream" in k8s? That will be probably named "cloud-provider-xo" or "cloud-provider-xenorchestra". What do you think?

It can't be done by XO, because XO is using XAPI to make all calls (there's no XAPI command to rename a file on the SR, also XO isn't connected via SSH, so there's 0 change it was caused by XO).

So it was done manually at some point (check your host bash history).

Thanks @cookie-eater2000, we'll take a look.

@stormi said in Installing Windows 10 on Xen Orchestra:

nd performance of the XO VM can also play a role in delaying the initial display of the console, in which case the console wouldn't display until it's too late to see

Its currently got 4 cores and 16gb ram out of the 24 core 3.5ghz 129gb host.

I will give these methods a go 🙂

@noship Which issue are you talking about exactly?

There's no issue nor restriction to replicate a shutdown VM.

CR will work as long as the destination VM never booted (otherwise destination blocks will be modified, so you understand now why we should block boot except if you really know what you do 😉 )

@olivierlambert Perfect, thanks again for your time!

@noship Hello. The secure boot feature is currently available as pre-release code. My personal experience is that it works well for my use case. Some others are reporting boot issues after installing the updates so it continues to evolve and is not yet released for production. Search the forum for UEFI and you will find the relevant threads for obtaining and installing secure boot support. Here's one: https://xcp-ng.org/docs/guides.html#guest-uefi-secure-boot

@alexanderk @olivierlambert Sorry to have not responded sooner to your question. It has been a very long, slow slog so far and I haven't been able to devote as much time as I'd like to working on this. Here's what I've done so far: Based on Andrew Cooper's recommendation, I installed a fully patched Windows Server 2008 R2 VM to Xen. (Hyper-V was initially released with Server 2008 so this is almost as far back as you can go.) Using the current unmodified Xen source code, the VM will permit Hyper-V to be enabled in the Windows Server 2008 R2 guest, but--as with newer versions of Windows--once you perform the finishing reboot, Hyper-V is not actually active. Adding the two recommended source-code patches, recompiling and performing the same test causes the VM to hang following the enablement of Hyper-V. I know that I need to set up a serial console for the VM in order to view any logging that might provide a clue as to what's failing during the boot, but I haven't worked that out just yet.

I've also spent some considerable time reading through the Xen Dev email posts on the history of the development of nested virtualization in Xen. One very significant learning from that reading is that nested virtualization on Xen was initially developed by an AMD developer. Development of the NV feature-set for Intel came later after the AMD-focused design die had been cast. As far as I can tell given that I'm running Server 2008 R2, this never worked on Intel. (Maybe it did on an older Intel processor, but I am currently working with SkyLake i7-6700s so have no way to test older hardware.) Unfortunately, I also don't have appropriate AMD hardware on which to perform the same test to see whether or not it might work on AMD.

On the Microsoft Hyper-V side, it seems as though the opposite evolution happened. Nested virtualization was developed on Intel first, then (very recently) AMD. This makes me suspect that it doesn't work on AMD either. In other words, I don't know that nested virtualization of Windows on Xen ever worked such that Hyper-V was actually active in the guest. I would be delighted to have somebody prove me wrong.

You might ask Xen project upstream directly (on appropriate mailing list), see https://xenproject.org/help/mailing-list/

However, if there's nobody interesting to do this, it means no money. If your company is interesting in it, we can try to see the amount of work needed (IMHO: not trivial at all) and get a rough price estimate.

Hmm is it a big gap? I would have expect more 🤔

Anyway, @fohdeesha will give us some leads 🙂