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High load clusters IO requeremets

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Andrei Burd 2018-06-20 17:54:22 +03:00 committed by Andrei Burd
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website/source/guides/cluster/requirements.html.md
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@ -12,14 +12,14 @@ description: |-
## Resources (RAM, CPU, etc.) ## Resources (RAM, CPU, etc.)
**Nomad servers** may need to be run on large machine instances. We suggest **Nomad servers** may need to be run on large machine instances. We suggest
having between 4-8+ cores, 16-32 GB+ of memory, 40-80 GB+ of disk and having between 4-8+ cores, 16-32 GB+ of memory, 40-80 GB+ of **fast** disk and
significant network bandwidth. The core count and network recommendations are to significant network bandwidth. The core count and network recommendations are to
ensure high throughput as Nomad heavily relies on network communication and as ensure high throughput as Nomad heavily relies on network communication and as
the Servers are managing all the nodes in the region and performing scheduling. the Servers are managing all the nodes in the region and performing scheduling.
The memory and disk requirements are due to the fact that Nomad stores all state The memory and disk requirements are due to the fact that Nomad stores all state
in memory and will store two snapshots of this data onto disk. Thus disk should in memory and will store two snapshots of this data onto disk, which causes high IO in busy clusters with lots of writes. Thus disk should
be at least 2 times the memory available to the server when deploying a high be at least 2 times the memory available to the server when deploying a high
load cluster. load cluster. When running on AWS prefer NVME or Provisioned IOPS SSD storage for data dir.
These recommendations are guidelines and operators should always monitor the These recommendations are guidelines and operators should always monitor the
resource usage of Nomad to determine if the machines are under or over-sized. resource usage of Nomad to determine if the machines are under or over-sized.