1. Server requirements

Number of servers for minimal Warren cluster

Datacenter SaaS and on-premises Warren deployments require a minimum of 4 servers to offer virtualization-based (no bare-metal) functionality. 

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2. Servers and Networking Devices models and spec

All servers must have PXE boot capability and IPMI Remote Management Interface. PXE boot must be activated as a first boot option during Warren setup phase 1 only and can be deactivated afterward.

Supported CPU manufacturers are Intel, AMD and some models of ARM (Intel is preferable). 

RAM version is not fixed (both DDR3 and DDR4 are supported for each node type)

• Control domain servers - In case of small cluster sizes (less than 20 hypervisors) Xeon x56XX (single or dual CPU) or at least 46-core Xeon E3 and 32GB RAM (expandable to 64GB) per node suffice. For larger clusters, please discuss this matter before Warren deployment is started.

• Virtualization domain servers - Although there are no strictly defined minimum system requirements for virtualization hosts, it is recommended to have 2 x 8-core Xeon E5 (or higher) and 256GB RAM (recommended RAM amount heavily depends on the number of cores in total).
• Networking domain -  Juniper EX QFX series switches and MX series routers are preferred. (for possible device topology, please see diagrams in SDN Setup Plans) For other vendors compatibility, please be sure that routers have following options available and configured:
• Dynamic GRE tunnels (MPLS over UDP/GRE)

• VxLAN

• Multiprotocol Extensions for BGP (MBGP or MP-BGP)

• L3VPN

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• There are no strict requirements on networking equipment manufacturers (Juniper and Mellanox are preferred).

• NIC requirements:

• For Control domain servers, at least 2 extension NICs, one of which must be 10GbE or 25GbE (dual-port recommended)

• For Virtualization domain servers, at least 2 extension NICs, both 10GbE or 25GbE(dual-port recommended)

• All server need additionally Additionally, for management and hardware monitoring purposes, at all servers must include at least 1 NIC, 1GbE.

4. Storage

• As a system storage, both, Control domain and Virtualization domain require:
  

  • At least 2 x 250 500 GB SSD or NVMe in RAID 1 as a boot storage

  • At least 2 TB SSD or NVMe for Warren components and caching

• As a user storage for Virtualization domain, at least one of the following storage types is a strong requirement:
  • Distributed storage (e.g. Ceph)
• Other user storage types are in BETA stage and will be available in the future:
  • Local storage of SSD or NVMe in RAID 10
  • Enterprise storage solution (e.g. 3PAR)
    
    

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• One server should be equipped with bootable Linux and DHCP + TFTP service set provided by Warren team, installed on it.
• All servers should come by with NixOS 18.09 Installed