[Yandex Cloud documentation](../../index.md) > [Yandex Managed Service for Valkey™](../index.md) > [Concepts](index.md) > Host classes > Active host classes # Valkey™ host classes The host class determines the computing power allocated for each host in a cluster. When you change the class for a cluster, all existing hosts change to match it. {% note info %} The amount of memory allocated to a host also depends on the `maxmemory` configuration parameter for Valkey™ hosts: the maximum amount of data equals 75% of available memory. To learn more, see [Memory management](memory-management.md). {% endnote %} The host class determines the available [disk types](storage.md): * **hm1**: `network-ssd`, `local-ssd`. * **hm2**, **hm3**: `network-ssd`, `local-ssd`, `network-ssd-nonreplicated`, `network-ssd-io-m3`. * **b2**, **b3**: `network-ssd`. The storage space available to the host should be at least twice as large as the selected memory size. For more information on Yandex Managed Service for Valkey™ technical and organizational limitations, see [Quotas and limits](limits.md). ## Available host classes {#available-flavors} Configuration types: * **burstable**: Configurations with a [guaranteed vCPU share](../../compute/concepts/performance-levels.md) 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 100%. * **high-memory**: Standard configurations for Valkey™. A cluster with this configuration type may contain several hosts (from one to current [quota](limits.md) limit) per cluster or [shard](sharding.md). The minimum number of hosts per cluster [depends](limits.md#mrd-limits) on the [selected disk type](storage.md). {% note info %} Clusters with hosts residing in the `ru-central1-d` [availability zone](../../overview/concepts/geo-scope.md) do not support: - Intel Broadwell - Local SSD storage if using Intel Cascade Lake {% endnote %} {% note alert %} Starting January 1, 2024, the following host classes are out of service: `b1.nano`, `b1.micro`, `b1.small`, `b2.nano`, `b2.micro`, and `b2.small`. You will not be able to create hosts of these types starting June 20, 2023. {% endnote %} | Host class name | Number of vCPUs | RAM, GB | CPU performance | Disk
size, GB | |-------------------|----------------|---------|------------------------|----------------------| | **Intel Broadwell** | | hm1.nano | 2 | 8 | 100% | 16 - 4,096 | | hm1.micro | 2 | 12 | 100% | 24 - 4,096 | | hm1.small | 2 | 16 | 100% | 32 - 4,096 | | hm1.medium | 4 | 24 | 100% | 48 - 4,096 | | hm1.large | 4 | 32 | 100% | 64 - 4,096 | | hm1.xlarge | 4 | 48 | 100% | 96 - 4,096 | | hm1.2xlarge | 4 | 64 | 100% | 128 - 4,096 | | hm1.3xlarge | 4 | 80 | 100% | 160 - 4,096 | | hm1.4xlarge | 8 | 96 | 100% | 192 - 4,096 | | hm1.5xlarge | 8 | 128 | 100% | 256 - 4,096 | | hm1.6xlarge | 8 | 160 | 100% | 320 - 4,096 | | hm1.7xlarge | 8 | 192 | 100% | 384 - 4,096 | | hm1.8xlarge | 8 | 224 | 100% | 448 - 4,096 | | hm1.9xlarge | 8 | 256 | 100% | 512 - 4,096 | | **Intel Cascade Lake** | | b2.medium | 2 | 4 | 50% | 8 - 32 | | hm2.nano | 2 | 8 | 100% | 16 - 8,184 | | hm2.micro | 2 | 12 | 100% | 24 - 8,184 | | hm2.small | 4 | 16 | 100% | 32 - 8,184 | | hm2.medium | 4 | 24 | 100% | 48 - 8,184 | | hm2.large | 4 | 32 | 100% | 64 - 8,184 | | hm2.xlarge | 4 | 48 | 100% | 96 - 8,184 | | hm2.96xlarge | 6 | 96 | 100% | 192 - 8,184 | | hm2.128xlarge | 8 | 128 | 100% | 256 - 8,184 | | hm2.160xlarge | 10 | 160 | 100% | 320 - 8,184 | | hm2.192xlarge | 12 | 192 | 100% | 384 - 8,184 | | hm2.224xlarge | 14 | 224 | 100% | 448 - 8,184 | | hm2.256xlarge | 16 | 256 | 100% | 512 - 8,184 | | hm2.320xlarge | 20 | 320 | 100% | 640 - 8,184 | | hm2.384xlarge | 24 | 384 | 100% | 768 - 8,184 | | hm2.448xlarge | 28 | 448 | 100% | 896 - 8,184 | | hm2.512xlarge | 32 | 512 | 100% | 1024 - 8,184 | | **Intel Ice Lake** | | b3-c1-m4 | 2 | 4 | 50% | 8 - 32 | | hm3-c2-m8 | 2 | 8 | 100% | 16 - 8,184 | | hm3-c2-m12 | 2 | 12 | 100% | 24 - 8,184 | | hm3-c4-m16 | 4 | 16 | 100% | 32 - 8,184 | | hm3-c4-m24 | 4 | 24 | 100% | 48 - 8,184 | | hm3-c4-m32 | 4 | 32 | 100% | 64 - 8,184 | | hm3-c4-m48 | 4 | 48 | 100% | 96 - 8,184 | | hm3-c6-m60 | 6 | 60 | 100% | 120 - 8,184 | | hm3-c6-m78 | 6 | 78 | 100% | 156 - 8,184 | | hm3-c6-m96 | 6 | 96 | 100% | 192 - 8,184 | | hm3-c8-m128 | 8 | 128 | 100% | 256 - 8,184 | | hm3-c12-m192 | 12 | 192 | 100% | 384 - 8,184 | | hm3-c14-m224 | 14 | 224 | 100% | 448 - 8,184 | | hm3-c16-m256 | 16 | 256 | 100% | 512 - 8,184 | | hm3-c20-m320 | 20 | 320 | 100% | 640 - 8,184 | | **AMD Zen 4** | | m4a-c2-m16 | 2 | 16 | 100% | 32 - 8,184 | | m4a-c4-m32 | 4 | 32 | 100% | 64 - 8,184 | | m4a-c8-m64 | 8 | 64 | 100% | 128 - 8,184 | | m4a-c16-m128 | 16 | 128 | 100% | 256 - 8,184 | | m4a-c32-m256 | 32 | 256 | 100% | 512 - 8,184 | | m4a-c64-m512 | 64 | 512 | 100% | 930 - 8,184 | | m4a-c96-m768 | 96 | 768 | 100% | 1,536 - 8,184 | | m4a-c128-m1024 | 128 | 1,024 | 100% | 2,048 - 8,184 | | m4a-c224-m1792 | 224 | 1,792 | 100% | 3,534 - 8,184 | | **AMD Zen 4 HighFreq** | | m4af-c2-m16 | 2 | 16 | 100% | 32 - 8,184 | | m4af-c4-m32 | 4 | 32 | 100% | 64 - 8,184 | | m4af-c8-m64 | 8 | 64 | 100% | 128 - 8,184 | | m4af-c16-m128 | 16 | 128 | 100% | 256 - 8,184 | | m4af-c32-m256 | 32 | 256 | 100% | 512 - 8,184 | | m4af-c48-m384 | 48 | 384 | 100% | 768 - 8,184 | | m4af-c80-m640 | 80 | 640 | 100% | 1,280 - 8,184 | | hm4af-c2-m20 | 2 | 20 | 100% | 40 - 8,184 | | hm4af-c2-m24 | 2 | 24 | 100% | 48 - 8,184 | | hm4af-c4-m40 | 4 | 40 | 100% | 80 - 8,184 | | hm4af-c4-m48 | 4 | 48 | 100% | 93 - 8,184 | | hm4af-c8-m80 | 8 | 80 | 100% | 160 - 8,184 | | hm4af-c8-m96 | 8 | 96 | 100% | 186 - 8,184 | | hm4af-c16-m160 | 16 | 160 | 100% | 279 - 8,184 | | hm4af-c16-m192 | 16 | 192 | 100% | 384 - 8,184 | | hm4af-c32-m320 | 32 | 320 | 100% | 640 - 8,184 | | hm4af-c32-m384 | 32 | 384 | 100% | 768 - 8,184 | | hm4af-c48-m480 | 48 | 480 | 100% | 930 - 8,184 | | hm4af-c48-m576 | 48 | 576 | 100% | 1,152 - 8,184 | | hm4af-c80-m800 | 80 | 800 | 100% | 1,600 - 8,184 | | hm4af-c80-m960 | 80 | 960 | 100% | 1,860 - 8,184 |