[Yandex Cloud documentation](../../../index.md) > [Yandex StoreDoc](../../index.md) > [Concepts](../index.md) > Host classes > Archive > Before June 1, 2020

# Yandex StoreDoc host classes prior to June 1, 2020

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

The available storage size does not depend on the host class. For storage limitations, see [Quotas and limits](../limits.md).

## Available host classes {#available-flavors}


Hosts in Yandex StoreDoc clusters are deployed on Yandex Compute Cloud VMs. You can create these VMs on any platforms Compute Cloud supports. To learn more about the platforms, see [Platforms](../../../compute/concepts/vm-platforms.md).
The full list of possible host configurations on each platform is provided below.

Configuration types:

* **s1, s2**: Standard configurations with 4:1 RAM GB to vCPU ratio.
* **m1, m2**: Configurations with an increased RAM GB to vCPU ratio (8:1). These configurations may be useful for clusters with higher cache requirements.
* **b1, b2**: Configurations with a guaranteed vCPU share under 100%. This host class is intended for test load, while the minimum recommended host configuration for production solutions is two vCPUs with a guaranteed share of 50%.

  {% note info %}

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

  {% endnote %}

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