Hi!

I have been using Xen for nearly 10 years, now. I started with VirtualIron and changed over to Xenserver when Citrix closed VI.
My use-case is mostly a company-network of a mid-size-company.

I still think Xenserver/XCP-ng is one of the best platforms (thats why I became a sponsor). There are no very good alternatives.

• VMWare is only a good solution if you pay for the "large" Enterprise bundles
• Proxmox/oVirt is very limited
• HyperV is a Microsoft Product...

What I really like on Xenserver/XCP-ng is the possiblity to run the same Hypervisor with the same featureset on every test-server, production-cluster, and the possibility to live-migrate between pools.

Hi!

I was now able to solve both issues (thank you @olivierlambert):

• Adding additional Management Interface:
  --> XOA - Host - Network - Change Type to "static"

• Moving Management Interface to Bond:
  --> XOA - Pool - Network - Create Bond with "old" single-Interface and another interface
  ----> IP is automatically reassigned to Bond

You can get the backups from the logs:

/rest/v0/backup/logs?fields=tasks

Just if somebody else is searching for the same thing, although it is not directly related to XOA:

If you want to get these alerts by mail and you are not using XCP-ng-Center, you can activate them with:

xe pool-param-set uuid=pool-uuid other-config:mail-destination=mail@example.com
xe pool-param-set uuid=pool-uuid other-config:ssmtp-mailhub=mailserverip:port

KPS

Hi!

I am using XOA on lates stable 5.98.1.
The "Performance-Plugin" seems to have a problem on the resolution of alerts:

First Mail: SR-fill >80%: iSCSI-SR1: 80.1% used
Resolution Mail: END OF ALERT: localstorage: 0.0% used

--> When iSCSI-SR1 did fall below 80% I received the mail about a totally different SR, that is currently empty

Are you having the same issue?

Regards
KPS

I do not think, there will be a "Veeam for XCP-ng". I think, we should hope and help to improve XOA.

My (constructive) critic points:

• Backup and restore speed should be higher
• Instant restore "pendant" is missing --> makes restore speed MORE critical
• No real "progressbar" on jobs!
• Maintenance-jobs not really visible at all (backup-merge!)

There is also one other thing, but I think, it can be handled mostly with additional agent-based-software:

• Application aware backups (active directory, sql, etc.)

--> So the main point is: You are currently not able to estimate the speed or progress of jobs until they are finished and you do not see maintence jobs

@nikade
I think, this can be handled. The downsides are the inefficient way to save the VMs, which can perhaps be minimized with ZFS storage for some compression, but it is working.

You really need an application aware backup with AD.

Option 1: Additional backup-software
Option 2: Combine Windows-Backup with XOA
--> A system-state-backup should be sufficient.
Option 3: Install a new DC

@Tristis-Oris
That's a "known issue":
https://xcp-ng.org/forum/topic/7827/xoa-does-not-refresh-quickly-status-of-nics

XCP-ng-center is showing the update.

@ferrao
There is another thread about bad performance of migrated VMs, where the main reason was/is, that the wrong template was active which did lead to a degraded performance.

Hi!

I am having a strange issue:

When I update XenTools (Citrix-ones) from e.6. 9.3.2 to 9.4.2, there are two NICs visible in Windows 2022 after the first reboot.

After the second reboot, there is only one (as in XOA).

Do you see the same issue?
Is there anything, I can do to avoid the second reboot?

Best wishes
KPS

@Pilow
My migration speed is a bit lower than yours. I am at about 350MiB. What is your setup?

But: I think, the "migration time" is not as important, as the freeze-time... (at least for me)

@olivierlambert
Yes, it's 37s for the migration of a VM with 8GB RAM.
For large VMs, that is critical (5:20 min for 96GB RAM).

...but the core-issue is the freeze, as everything above 4s can leads to disconnects, etc.

Hi!

When I migrate VMs between hosts (with shared storage), the migration takes significantly longer compared to VMware.

Environment:

AMD EPYC 9374F

768 GB RAM

6 × 10 GbE

Observation:

Migrating a VM with 8 GB RAM takes 0:37 min.
Migrating a VM with 96 GB RAM takes around 5:20 min.

Additionally, during the final step of the migration, large VMs experience a noticeable freeze of about 8-10 seconds although they are nearly idle, which makes live pool upgrades during business hours impractical.

Is there anything, I can do to speed this up - especially the freeze?

Best wishes
KPS

@icompit
Did you ever solve this? I am having exactly the same problem...

@GuillaumeHullin
That was the trick!

GRUB_TIMEOUT_STYLE="menu" did solve it!

@GuillaumeHullin said in Linux VM (Ubuntu 22.04) - Grub-Menu invisible:

GRUB_TIMEOUT_STYLE

I did change GRUB_TIMEOUT_STYLE from "hidden" to "timeout".
Now, the system is counting down from 5 to 1 (on a screen, where the rest is black), but the menu is still missing

@GuillaumeHullin
This was just something, I found while googeling...
I did use your config, but still:

• Black screen instead of the boot-menu.

@GuillaumeHullin said in Linux VM (Ubuntu 22.04) - Grub-Menu invisible:

Hi,
Have you run sudo update-grub after changing your configuration?

Yes, I did

Hi!

I am having a problem with linux VMs, that are not showing grub.
The console of the VM is black until the VM does really start.

What I tried:

Changed grub-config to:

GRUB_TIMEOUT=5
GRUB_TERMINAL=console

and

GRUB_TERMINAL="serial"
GRUB_CMDLINE_LINUX="console=tty0 console=ttyS0,115200"
GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"

Can you give me a hint on how to solve this?

Best wishes