Host classes

The host class determines the computing power allocated for each host in the cluster. When you change the host class for a cluster, all existing hosts change to match it.

The available storage doesn't depend on the host class. For storage limitations, see the section Quotas and limits.

Available host classes

Hosts in Managed Service for MongoDB clusters are deployed on Yandex Compute Cloud VMs. You can create these VMs on any of the platforms that Compute Cloud supports. For a detailed description of the platforms, see Platforms.

The full list of possible host configurations on each platform is provided below.

Configuration types:

• s1, s2: Standard configurations, with 1:4 vCPU to GB RAM ratio.

• m1, m2: Configurations with a decreased vCPU to GB RAM ratio (1:8 vs. 1:4 for standard classes). These configurations can be useful for clusters with increased cache requirements.

• b1, b2: Configurations with a guaranteed vCPU share under 100%. This class of hosts is intended for test load, with the minimum recommended host configuration for production solutions being 2 vCPUs with a guaranteed share of 50%.

  Note

  Hosts with a guaranteed vCPU share under 100% can't be used in multi-host clusters.

Host class name	Number of CPUs	CPU performance	RAM, GB
Intel Broadwell
b1.nano	2	5%	2
b1.micro	2	20%	2
b1.medium	2	50%	4
s1.nano	1	100%	4
s1.micro	2	100%	8
s1.small	4	100%	16
s1.medium	8	100%	32
s1.large	16	100%	64
s1.xlarge	32	100%	128
Intel Cascade Lake
b2.nano	2	5%	2
b2.micro	2	20%	2
b2.medium	2	50%	4
m2.micro	2	100%	16
m2.small	4	100%	32
m2.medium	6	100%	48
m2.large	8	100%	64
m2.xlarge	12	100%	96
m2.2xlarge	16	100%	128
m2.3xlarge	24	100%	192
m2.4xlarge	32	100%	256
m2.5xlarge	40	100%	320
m2.6xlarge	48	100%	384
m2.7xlarge	56	100%	448
m2.8xlarge	64	100%	512
s2.micro	2	100%	8
s2.small	4	100%	16
s2.medium	8	100%	32
s2.large	12	100%	48
s2.xlarge	16	100%	64
s2.2xlarge	24	100%	96
s2.3xlarge	32	100%	128
s2.4xlarge	40	100%	160
s2.5xlarge	48	100%	192
s2.6xlarge	64	100%	256