Regions, availability zones and pools
With Selectel's products and services, you can create an infrastructure with all fault tolerance and security requirements taken into account.
Selectel's infrastructure is deployed in four countries and is divided into 6 regions, 10 availability zones and 24 pools.
To see the availability of Selectel products and services in different regions, please visit accessibility matrix.
Region
Region (example: Saint Petersburg) is a number of data centers, Selectel and partner data centers, which are located within the agglomeration of a large city. Data centers in the same region are connected by a fiber optic link with data redundancy, and minimal signal delay is ensured between data centers within a region. Read more about data centers on the page Data centers on selectel.co.uk.
Each region is completely isolated from the others: separate connection to power lines, autonomous power and cooling sources, dedicated communication channels.
Selectel provides connectivity between regions through redundant high-capacity communication channels.
To host your application, we recommend choosing the region closest to your users as the main region. You can deploy resources in different regions — then the infrastructure will be able to survive possible ISP failures, such as internet outages at the border level, natural disasters and emergencies with minimal down time.
You can see the list of regions in the table Selectel Infrastructure.
Accessibility zone
Accessibility zone (example: Зона доступности 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 ultra-low latency communication channel.
Selectel backs up all critical elements of the system in the availability zone: power supply, air conditioning, network infrastructure. Each availability zone is provided with round-the-clock physical security and monitoring. Equipment maintenance operations are not performed simultaneously in multiple Availability Zones in 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 for the entire region. This will protect your system in the event of a failure in one of the zones, such as a power outage in the data center, fire, or weather events.
To see the list of accessibility zones, please see the table Selectel Infrastructure.
Poole
Pool (example: ru-9, SPB-4) — part of the infrastructure in one data center. In each data center and, accordingly, in the availability zone there are several pools. Each pool is isolated from hardware and software failures in other pools.
Network connectivity within a pool is provided by an L2 connection. To configure connectivity between pools, you can use Selectel global router.
Placing infrastructure in multiple pools protects against network hardware and software failures (e.g., network hardware failure or power 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 within the same data center.
To see a list of pools and segments, see the table below Selectel Infrastructure.
Certified accessibility zone
The certified availability zone includes a gis-1 pool with a gis-1a segment.
Attested Availability Zone — the availability zone of Selectel's cloud platform that is compliant:
- requirements of Order No. 17 of the FSTEC of Russia dated February 11, 2013;
- requirements of Order No. 21 of the FSTEC of Russia dated February 18, 2013;
- Special Requirements and Recommendations for Technical Protection of Confidential Information (STR-K, Order of the State Technical Commission No. 282 of 30.08.2002).
Suitable for placement:
- state information systems (GIS) up to and including the first security class (K1);
- personal data information systems (PDIS) up to and including the first level of security (UZ-1);
- automated systems (AS) in a protected version of class 1G.
To see the availability of products and services in the certified area, go to accessibility matrix.
Increase fault tolerance
You can improve infrastructure resiliency at the region, availability zone, pool, and additionally at the server level:
- for a dedicated server-- move the server to another rack;
- cloud server — put servers on different hosts in the accommodation group.
Learn more about improving resiliency in Selectel's blog article Four ways to improve infrastructure resilience in Selectel.
Selectel Infrastructure
St. Petersburg
Moscow
Novosibirsk
Tashkent
Almaty
Nairobi