Datacentre
The Cloud Infrastructure service allows to provide resources in the following datacentres:
- Meyrin Data Centre (MDC, Building 513)
- Prevessin Data Centre (PDC, Building 775)
Following the project definition in project roles, projects that can be personal or shared.
These two datacentres will be exposed through regions to users. Shared projects will have access to both regions while personal projects will only be able to use the Meyrin Data Centre.
A user in a shared project may select through the regions to do operations on one of the sites through the website or through
the environment variable OS_REGION_NAME:
export OS_REGION_NAME=cernfor the Meyrin Data Centre (MDC)export OS_REGION_NAME=pdcfor the Prevessin Data Centre (PDC)
Differences between datacentres
As part of the deployment of the new datacentre, the cloud team has rearchitected the deployment and start offering features that require major changes for the Meyrin DC. The intent is to offer them in the Prevessin site first before bringing them on the Meyrin site.
| Feature | Meyrin DC | Prevessin DC |
|---|---|---|
| Availability Zones | 3 Compute 3 Storage |
1 Compute & Storage |
| Cross Zone attachments | YES | NO |
| Anti-/Affinity Filters | Host | Host, Rack, Room |
| Networks | Provider | Provider & Private |
| Software Defined Networking | Load Balancers | Load Balancers Security Groups Floating IPs |
| Diesel backup | only in critical area | - |
| UPS Expected lifetime | 10 minutes | 5 minutes |
Availability Zones
The new datacentre currently uses the resources available in the 3rd Floor (Initially with room 5, and then later room 6 will join) The approach will follow the floors for the Availability Zones as they both share the same UPS unit and Network.
Cross Zone attachments
To guarantee uptime in the new datacentre, we'll block any attachment across availability zones. This will prevent issues between the different availability zones in the new building.
Anti-/Affinity Filters
The new datacentre starts with a single zone. So to allow users to spread their machines into the room, we have additional filters that will allow users to spread machines across different hosts, racks or rooms. This improves their availability within a single zone.
Networks
In terms of networking, the new datacentre adds private project networks to the portfolio. Allowing users to create their own network to communicate between the Virtual Machines.
The network component in the Prevessin Data Centre currently doesn’t support the Privacy Extensions defined by RFC 4941, or the Opaque Identifier generation methods defined in RFC 7217 as explained in the following link
If you are experiencing this issue, please follow the workaround in the FAQ shown in this link
Software Defined Networking
In addition of the loadbalancer as a service, the new datacentre offers Security Groups that adds an additional firewall protection to virtual machines. It also offers floating IPs that can be allocated to existing VMs across network services.
Diesel backup
The only location backed by a diesel generator is located in the critical area of Meyrin DC. Please note that there is no diesel backed area in the Prevessin DC.
Uninterruptible power supply (UPS) Expected lifetime
Please note that in case of a major power outage, the datacentres have different UPS sizes and therefore their expected lifetime is different.