The type of instance you may have access to depends directly on the project (as defined by Openstack). It is set during the cloud access request. CC-IN2P3 provides two types of instances optimized for specific use cases:

HA type

This type of instance is used for teh implementation of production services. It answers to a need for high availability.

Impact on the implementation:

• the hypervisor hardware is highly available with maximum component redundancy,

• the instance storage is centralized, organized by distributed file systems and hosted on equipment optimized for highly available storage (N+2 on disks and N+1 on servers),

• paths between the hypervisors and the rest of the infrastructure are redundant on ACTIVE/ACTIVE 10Gbps (VM network and storage network for VMs),

• instances may be migrated at once to perform hypervisor maintenance without service interruption,

• instances may be restarted on another hypervisor immediately when a hypervisor is down.

R&D type

This type of instance is used for research and development.

Impact on the implementation:

• the level of availability does not ensure the setting up of highly available services on the instances;

• storage is local.