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README.md: add capacity planning chapter

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Aliaksandr Valialkin 2019-10-19 10:47:46 +03:00
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@ -184,6 +184,33 @@ Cluster should remain in working state if at least a single node of each type re
the update process. See [cluster availability](#cluster-availability) section for details.
### Capacity planning
Each instance type - `vminsert`, `vmselect` and `vmstorage` - can run on the most suitable hardware.
#### vminsert
* The recommended total number of vCPU cores for all the `vminsert` instances can be calculated from the ingestion rate: `vCPUs = ingestion_rate / 150K`.
* The recommended number of vCPU cores per each `vminsert` instance should equal to the number of `vmstorage` instances in the cluster.
* The amount of RAM per each `vminsert` instance should be 1GB or more. RAM is used as a buffer for spikes in ingestion rate.
* Sometimes `-rpc.disableCompression` command-line flag on `vminsert` instances could increase ingestion capacity at the cost
of higher network bandwidth usage between `vminsert` and `vmstorage`.
#### vmstorage
* The recommended total number of vCPU cores for all the `vmstorage` instances can be calculated from the ingestion rate: `vCPUs = ingestion_rate / 150K`.
* The recommended total amount of RAM for all the `vmstorage` instances can be calculated from the number of active time series: `RAM = active_time_series * 1KB`.
Time series is active if it received at least a single data point during the last hour or if it has been queried during the last hour.
* The recommended total amount of storage space for all the `vmstorage` instances can be calculated
from the ingestion rate and retention: `storage_space = ingestion_rate * retention_seconds`.
#### vmselect
The recommended hardware for `vmselect` instances highly depends on the type of queries. Lightweight queries over small number of time series usually require
small number of vCPU cores and small amount of RAM on `vmselect`, while heavy queries over big number of time series (>10K) usually require
bigger number of vCPU cores and bigger amounts of RAM.
### Helm
Helm chart simplifies managing cluster version of VictoriaMetrics in Kubernetes.