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Talk a bit about capacity balancing between regions

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Alex Auvolat 2022-03-17 17:21:17 +01:00 committed by Gitea
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doc/book/cookbook/real-world.md
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@ -23,7 +23,7 @@ To run a real-world deployment, make sure the following conditions are met:
- Ideally, each machine should have a SSD available in addition to the HDD you are dedicating
to Garage. This will allow for faster access to metadata and has the potential
to drastically reduce Garage's response times.
to significantly reduce Garage's response times.
- This guide will assume you are using Docker containers to deploy Garage on each node.
Garage can also be run independently, for instance as a [Systemd service](@/documentation/cookbook/systemd.md).
@ -35,12 +35,19 @@ For our example, we will suppose the following infrastructure with IPv6 connecti
| Location | Name | IP Address | Disk Space |
|----------|---------|------------|------------|
| Paris | Mercury | fc00:1::1 | 1 To |
| Paris | Venus | fc00:1::2 | 2 To |
| London | Earth | fc00:B::1 | 2 To |
| Brussels | Mars | fc00:F::1 | 1.5 To |
| Paris | Mercury | fc00:1::1 | 1 TB |
| Paris | Venus | fc00:1::2 | 2 TB |
| London | Earth | fc00:B::1 | 2 TB |
| Brussels | Mars | fc00:F::1 | 1.5 TB |
Note that Garage will **always** store the three copies of your data on nodes at different
locations. This means that in the case of this small example, the available capacity
of the cluster is in fact only 1.5 TB, because nodes in Brussels can't store more than that.
This also means that nodes in Paris and London will be under-utilized.
To make better use of the available hardware, you should ensure that the capacity
available in the different locations of your cluster is roughly the same.
For instance, here, the Mercury node could be moved to Brussels; this would allow the cluster
to store 2 TB of data in total.
## Get a Docker image
@ -208,10 +215,10 @@ For our example, we will suppose we have the following infrastructure
| Location | Name | Disk Space | `Capacity` | `Identifier` | `Zone` |
|----------|---------|------------|------------|--------------|--------------|
| Paris | Mercury | 1 To | `10` | `563e` | `par1` |
| Paris | Venus | 2 To | `20` | `86f0` | `par1` |
| London | Earth | 2 To | `20` | `6814` | `lon1` |
| Brussels | Mars | 1.5 To | `15` | `212f` | `bru1` |
| Paris | Mercury | 1 TB | `10` | `563e` | `par1` |
| Paris | Venus | 2 TB | `20` | `86f0` | `par1` |
| London | Earth | 2 TB | `20` | `6814` | `lon1` |
| Brussels | Mars | 1.5 TB | `15` | `212f` | `bru1` |
#### Node identifiers