Regions, availability zones and pools
With Selectel products and services, you can create an infrastructure that meets all the requirements for fault tolerance and security.
Selectel's infrastructure is located in four countries and is divided into 6 regions, 10 availability zones and 24 pools.
You can view the availability of Selectel products and services in different regions in availability matrices.
Region
A region (example: `Saint Petersburg') is several data centers, Selectel and partner ones, which are located within the agglomeration of a large city. Data centers in one region are connected by a fiber-optic communication line with data redundancy, and a minimum signal delay is provided between data centers within the region. For more information about data centers, see the Data centers page on selectel.ru .
Each region is completely isolated from the others: separate connection to electricity lines, autonomous power and cooling sources, dedicated communication channels.
Selectel provides connectivity between regions through redundant high-performance communication channels.
To host your application, we recommend choosing the region closest to users as the main one. You can place resources in different regions — then the infrastructure will be able to survive possible failures in the provider's work with minimal downtime, for example, Internet disconnection at the border level, natural disasters and emergencies.
You can view the list of regions in the Selectel Infrastructure table.
Availability zone
An availability zone (example: `Availability Zone 1') is one or more data centers within the same region. Each data center is equipped with autonomous power and cooling sources and its own redundant communication channel with ultra-low delays.
Selectel reserves all critical system elements in the availability zone: power supply, air conditioning, network infrastructure. Each accessibility zone is provided with round-the-clock physical security and monitoring. Equipment maintenance operations are not performed simultaneously in several availability zones of the same region.
We recommend reserving critical parts of your infrastructure in multiple availability zones. Availability zones do not have a single point of failure — only the point of failure of the entire region. This will protect your system in case of a failure in one of the zones, such as a power outage in the data center, fire and weather disasters.
You can view the list of availability zones in the Selectel Infrastructure table.
Pool
A pool (example: ru-9, `SPB-4') is a part of the infrastructure in one data center. There are several pools located in each data center and, accordingly, in the availability zone. Each pool is isolated from hardware and software failures in other pools.
Network connectivity within the pool is provided by an L2 connection. To set up connectivity between pools, you can use the Selectel global router.
Placing the infrastructure in several pools protects against network hardware and software failures (for example, network equipment failure or power supply circuit failure), reduces the likelihood of data loss and service downtime. The single point of failure of pools is failures in the availability zone.
Pools are divided into pool segments (example: ru-2a, ru-8a) — groups of equipment in different racks inside the same data center.
You can view the list of pools and segments in the Selectel Infrastructure table.
Certified availability zone
The gis-1 pool with the gis-1a segment is located in the certified availability zone.
Certified Availability zone is the availability zone of the Selectel cloud platform, which corresponds to:
- requirements of the FSTEC of Russia Order No. 17 dated February 11, 2013;
- requirements of the Order of the FSTEC of Russia dated February 18, 2013 No. 21;
- Special requirements and recommendations for the technical protection of confidential information (PAGE-K, Order of the State Technical Commission dated 30.08.2002 No. 282).
Suitable for placement:
- State information systems (GIS) up to and including the first security class (K1);
- Personal data information systems (ISPDn) up to and including the first level of security (UZ-1);
- automated systems (AS) in a protected version of Class 1G.
You can view the availability of products and services in the certified zone in availability matrices.
Increase fault tolerance
It is possible to increase the fault tolerance of the infrastructure at the level of the region, availability zone, pool and additionally at the server level:
- for a dedicated server — move the server to another rack;
- for a cloud server, place servers on different hosts in the hosting group.
For more information about improving fault tolerance, see the Selectel blog article Four Ways to Increase Infrastructure Fault Tolerance in Selectel.
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