Availability
DGM’s hardware platform is co-located in a Class A Data Center, which provides high levels of protection from failures and disasters and stable operating conditions for the equipment. Every platform component is doubled for redundancy and high-availability. This guarantees an uninterruptable operation for the whole platform.
| Component | Remark |
Availability |
| Internet Services | 3 International Internet Providers, 3 Bulgarian (Peering) Internet Providers |
99.99% |
| Host Clusters | N+2 redundancy (in the event of failure of 2 hosts, the capacity of others is sufficient to take the load ); vSphere HA / DRS / Storage DRS |
99.99% |
| Host Servers | Dual Power Supply, Dual Cooling, 2 Network adapters, 2 SAN adapters – 4 network paths, 4 SAN paths |
99.99% |
| Network Switches | Redundant Network Core / Distribution (2 x Nexus 5500 in Stack)Redundant Network Host Access (2 x Nexus 2000 with 4 paths to Core) |
99.9995% |
| SAN Switches | Redundant Fabric (2 x Brocade 6505) | |
| Storage Clusters | Redundant Power Supply, Redundant Cooling, 2 Network and 6 SAN adapters – 4 network paths, 4 SAN paths. Synchronous Data Replication between two mirrored storage arrays, each of them configured with RAID 1+0 or RAID 5 protection, depending on the Storage Tier. |
99.99% |
| Disk Arrays | Redundant Power Supply, Redundant Cooling, 2 SAN adapters – 4 paths to SAN infrastructure, 4 paths to Virtual Machines |
99.99% |
| Management and Monitoring | Separate vSphere Cluster with separate vCenter on which all monitoring, management and security systems and software is deployed. |
99.99% |
| Management Network | Separate physical network with separate network switches for Out-of-band access to existing hardware, without depending on the state of hardware (direct independent link to the Management Processors of servers, Disk Arrays, Core / Distribution / Access Network Equipment, ePDU (controllable power cords in cabinets), Environmental Monitoring systems |
99.5% |
| System Architecture | The equipment is mirrored in separate Racks, so that it is possible to stop 50% of the hardware without interruption of the services. | |
| Data Center | Class A Data Center with 99.99% guaranteed service availability. Level of availability is achieved by reserving the technical infrastructure of the Data Center:N+1: Four independent electrical feeds @10kVA, to two different 110kVA grid sub-stations, are powering a transformer station with two redundant transformers. Sophisticated Automatic Transfer Switch system is in place.
N+1: Three diesel generators capable of providing backup power for the full load of the Data Center for at least 72 hours (and longer if the tank is refueled); 2N+1: Two groups of N pieces of UPS-system allow more than one failure of UPS without power interruption; The entire electrical system has built-in redundancy to ensure continuous operation |
99.99% |