# Storage

* Direct Attached Storage (DAS)
* Network Attached Storage (NAS)

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## Direct Attached

Low latency ephemeral storage, ideal for caching training datasets, model checkpoints and intermediate results. Denvr hosts include up to 30TB with read throughput up to 30 GB/s. On Denvr virtual machines these disks can be formatted and mounted with the following:

```shell-session
sudo mkfs -t ext4 /dev/vdc
mkdir -p /home/ubuntu/direct-attached
mount /dev/vdc /home/ubuntu/direct-attached
```

#### Tips

* Cache your models and datasets here to avoid bottlenecks during training or inference tasks.
* Backup results or checkpoints to our NAS for reuse on other Denvr hosts.

## Network Attached

Reliable distributed network storage for managing VM root disks, saving model checkpoints, and sharing datasets across hosts and even teams. Our network storage comes in **general** and **high-performance** tiers.

### General Storage

Low cost redundant storage for home directories, system files, reference datasets or docker images. Petabyte-scale with read throughput up to 1GB/s.

#### Tip

* Ideal for virtual machine root disks (`/dev/vda`)  and custom images.

### High-Performance Storage

High performance and redundant storage for sharing large model checkpoints and datasets across a cluster of machines or between users. Petabyte-scale capacity with read throughput up to 10GB/s.

#### Tip

* Backup DAS cached model checkpoints or training results here for future analysis or retraining.
* Personal shares are user specific stores that can be accessed from our virtual machine or application services. Default location is `~/personal`.
* Tenant shared can be accessed by any user in an account and is also available from either virtual machines or applications. Default location is `~/tenant-shared`.