Greenplum® host classes
The host class determines the computing power allocated for each host in a cluster. In a Managed Service for Greenplum® cluster, the classes of master hosts and segment hosts may differ. For information on how to select host classes, see Calculating the cluster configuration.
For master hosts, the host class determines which disk types are available:
- s2, i2:
local-ssd,network-ssd-nonreplicated. - s3, i3:
network-ssd,network-hdd,local-ssd,network-ssd-nonreplicated,network-ssd-io-m3.
For segment hosts, the following disk types are available:
local-ssdnetwork-ssd-nonreplicatednetwork-ssd-io-m3
The available storage size does not depend on the host class. For storage limitations, see Quotas and limits.
Available host classes
Managed Service for Greenplum® cluster hosts are deployed on Yandex Compute Cloud virtual machines on Intel Cascade Lake and Intel Ice Lake platforms with a guaranteed vCPU share of 100%. The full list of possible host configurations is provided below.
Note
For clusters with hosts residing in the ru-central1-d availability zone, local SSD storage is not available if using the Intel Cascade Lake platform.
Configuration types:
- s2, s3: Standard configurations with 4:1 RAM GB to vCPU ratio.
- i2, i3: Configurations with an increased GB RAM to vCPU ratio (8:1). These configurations may be useful for clusters with higher cache requirements. Hosts with this configuration run in a software-accelerated network, and their use significantly affects cluster pricing.
| Host class name | Number of vCPUs | vCPU performance | RAM, GB | Disk size, GB |
|---|---|---|---|---|
| Intel Cascade Lake | ||||
| s2.medium | 8 | 100% | 32 | 93 - 8184 |
| s2.large | 12 | 100% | 48 | 93 - 8184 |
| i2.2xlarge | 16 | 100% | 128 | 93 - 8184 |
| i2.4xlarge | 32 | 100% | 256 | 93 - 8184 |
| i2.5xlarge | 40 | 100% | 320 | 93 - 8184 |
| Intel Ice Lake | ||||
| s3-c8-m32 | 8 | 100% | 32 | 10 - 8192 |
| s3-c12-m48 | 12 | 100% | 48 | 10 - 8192 |
| i3-c16-m128 | 16 | 100% | 128 | 10 - 8192 |
| i3-c32-m256 | 32 | 100% | 256 | 10 - 8192 |
| i3-c40-m320 | 40 | 100% | 320 | 10 - 8192 |
Using dedicated hosts
You can use dedicated hosts for your master hosts, segment hosts, or all your cluster's hosts at the same time. In which case the cluster's hosts will reside on dedicated hosts from the group you select.
A cluster on dedicated hosts will have the following available to it:
- Configurations of the platform the group's dedicated hosts were created on.
- The whole local disk (
local-ssd) volume of the dedicated host. The maximum storage size per host is greater than if standard VMs are used.
Network drives are also available on dedicated hosts.
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