07.03.2023 – Accounting and Billing for the Cloud service

We informed all master users of all LRZ projects that have the permission to use the Compute Cloud that we work on an accounting and billing system for this service.

The following mail has been sent to all master users:

Date: Tue, 7 Mar 2023 14:26:49 +0100
To: All master users
Subject: Accounting and billing for LRZ Compute Cloud

Dear $masteruser,

today I am writing because you are the master user of the following $num LRZ
project$plural having permissions to use the LRZ Compute Cloud:


As you may have heard LRZ wants to start charging money for the usage of
the Compute Cloud service. This idea is around for several years now and this
mail is a heads-up that we currently work on a system to collect usage data and
implement (still missing) components needed for the accounting and billing

We know the lack of an overview of resources currently used (and charged for)
on a per-project basis as well as the possibility to limit costs in any way.
These are points we currently focus on.
Besides that we try to ensure that the fundamental data needed for accounting
and billing is complete and consistent before sending out any invoices or even
cost estimations.

To give you a rough idea this table will provide you with the costs when using
a particular flavor for one complete day.
These costs vary depending on the usage class ("Nutzerklasse") your project
belongs to.


An overview of the available flavors and the associated virtual hardware can be
found on our website:

There are still some open points and although I am not able to provide you with
a detailed roadmap or a particular date when we start charging you for your
resource consumption you should prepare yourself that the free usage of the
compute cloud service will come to an end. We hope that we can still offer free
access to a limited amount of resources in the future.
As soon as we have more information we will let you know.

I am aware that this mail might raise questions we cannot answer appropriately
at the moment. There are still many points that need to be discussed
LRZ-internally. For that reason we are open and thankful for any feedback
regarding this topic.

I will keep you up to date as soon I have any news to share.

Best regards

02.02.2021 – 05.02.2021 Power Outage


All cloud compontens (and the VMs) will be shut down.

We expect the Cloud to be fully operational during Friday, 5.2.2021.

The cloud has returned to operation.

Date: Thu, 28 Jan 2021 15:06:55 +0100
To: LRZ Compute Cloud Users
Subject: [Cloud Users] Service interruption shifted to: 02.02.21 16:00 -> 05.02.21
X-Editor: VIM - Vi IMproved 8.2 <>
User-Agent: Mutt/2.0.5 (2021-01-21) Darwin 19.6.0

LRZ Compute Cloud Users!

Unfortunately, the time of the power interruption has changed due to external
delays by 1 day. Sorry für the information that reached us today.

To keep the downtime as short as possible, we will shut down the cloud one day
later that mentioned in our previous mail on
    Tuesday, 02.02.2021, afternoon at 16:00 CET.

We expect that the cloud will become available again on
    Friday, 05.02.2021.

Sorry for any inconveniences,
best regards,
LRZ Compute Cloud Users,
in the meantime the time window of the power interruption has been narrowed 
down to:
    Tuesday, 2.2.2021 - Wednesday, 3.2.2021
We will start shutting down the cloud system on Monday, 1.2.2021, afternoon 
around 17:00 (5 PM).
Thanks for your understanding and sorry for any inconvenience,
On 14.01.21 at 09:28, Niels Fallenbeck <> wrote:
> LRZ Compute Cloud Users,
> In week 5 (February 1, 2021 - February 5, 2021), work will be carried out on
> the LRZ power infrastructure with regard to future computer systems. The LRZ
> Compute Cloud is affected by this measure. During this time, the cloud
> infrastructure will not be available for about 3 days. The entire cloud needs
> to be switched off, running VMs are shut down.
> Unfortunately, I can not tell you the exact time of the work at the moment, as
> it depends on preparations that will take place during the next week.
> As soon as I know the exact time of the service interruption, I will inform
> you again in more detail.
> Warm regards and sorry for any inconvenience,
> Niels
Dr. Niels Fallenbeck
Leibniz-Rechenzentrum (LRZ), IT-Infrastruktur Server und Dienste (ITS)
Boltzmannstr. 1, 85748 Garching, Germany
Phone: +49 89 35831-7860

26.05.2020 – 29.05.2020 Maintenance Window

Alle VMs werden in diesem Zeitraum heruntergefahren

=== English version below ===
Liebe Nutzer*innen der LRZ Compute Cloud,
seit dem Wartungfenster im letzten Juli haben sich wieder einige Arbeiten aufgestaut, die wir nicht im laufenden Betrieb transparent für die Nutzer durchführen können. Diese Arbeiten werden wir im Zeitraum vom Dienstag, 26.05.2020 ab 10 Uhr, bis Freitag, 29.05., durchführen.
In diesem Zeitraum werden wir nicht nur Firmwareupdates für die Server und Softwareupdates und -bugfixes für deren Betriebssysteme einspielen, sondern auch die Server teilweise neue verkabeln und weiteren Hauptspeicher in jene Server einbauen, die Ressourcen für virtuelle Maschinen ohne GPUs bereitstellen.
In den letzten Wochen sind wir mehrfach in die Situation gekommen, dass Nutzer*innen keine neuen VMs mehr starten konnten, da alle CPUs bereits vergeben waren: Die Cloud war (und ist!) voll. Um diese Situation zu entspannen, haben wir uns die Nutzung der Hardware angeschaut und sind zu dem Schluss gekommen, dass wir die CPUs überbuchen werden, um für virtuelle Maschinen mehr CPUs zur Verfügung stellen zu können, als tatsächlich vorhanden sind - die Compute Cloud wächst also virtuell. Da die reale CPU-Auslastung der Server deutlich unter 20% liegt, erwarten wir keine spürbare Auswirkung auf die Performance der VMs.
Sollten Sie Fragen haben, stehen wir selbstverständlich für Rückfragen zur Verfügung.
Herzlichen Dank und viele Grüße,
Niels Fallenbeck
=== English ===
Dear LRZ Compute Cloud users,
since the maintenance window last July, some work has accumulated that we cannot carry out transparently for the users during operation. We will perform these maintenance tasks in the period from Tuesday, May 26, 2020 from 10 a.m. to Friday, May 29.
During this period, we will not only install firmware updates for the servers, software updates, and bug fixes, but we will also need to rearrange the cabling and install additional main memory modules in the servers that provide resources for the "normal" virtual machines without GPUs.
In the past few weeks, we have been faced multiple times with the situation that users were no longer able to start new VMs because of the lack of free CPUs: the cloud was (and is!) full. To relax this situation, we have looked at the real hardware utilization and came to the conclusion that we will overbook the CPUs in order to be able to provide more CPUs for virtual machines than actually exist - the compute cloud will grow virtually. Since the real CPU load is lower than 20%, we do not expect any noticeable impact on the performance of the VMs.
If you have any questions, we are of course available to answer any questions.
Thank you very much and best regards,
Niels Fallenbeck

09.07.2019 – 12.07.2019 Maintenance Window

  1. MTU issue: The default Networks MWN and internet public to all user have been configured incorrectly .At the moment the MTU size of a network interface attached to a VM  is set to 1450. Docker and Windows "do not like this". → we will migrate all current network interfaces to a  copy of the internet and MWN networks  which will finally run a MTU size of 1500.
  2. Impact to the users of the VM → all MAC addresses inside the VM will change, but all IP addresses (internal/floating) will stay the same  and work → This is considered to be  be OK.
  3. All VMs will be rebooted due to a necessary firmware upgrade of the hardware and the need to partially recable the hardware.