[Yandex Cloud documentation](../../../index.md) > [Yandex Managed Service for MySQL®](../../index.md) > [Concepts](../index.md) > Host classes > Archive > Before June 1, 2020

# MySQL® host classes prior to June 1, 2020

A host class in Managed Service for MySQL® determines the computing power allocated for each host in the 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 Managed Service for MySQL® clusters are deployed on Yandex Compute Cloud VMs. You can create these VMs on any platforms Compute Cloud supports. See [Platforms](../../../compute/concepts/vm-platforms.md) for a detailed description.
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 vCPUs | CPU performance | RAM, GB |
----- | ----- | ----- | -----
| **Intel Broadwell** | |
| b1.nano | 2 | 5% | 2 |
| b1.micro | 2 | 20% | 2 |
| b1.medium | 2 | 50% | 4 |
| m1.micro | 2 | 100% | 16 |
| m1.small | 4 | 100% | 32 |
| m1.medium | 6 | 100% | 48 |
| m1.large | 8 | 100% | 64 |
| m1.xlarge | 12 | 100% | 96 |
| m1.2xlarge | 16 | 100% | 128 |
| m1.3xlarge | 24 | 100% | 192 |
| m1.4xlarge | 32 | 100% | 256 |
| 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 |