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Crail: a fast multi-tiered distributed storage system

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[![Documentation Status](https://readthedocs.org/projects/crail/badge/?version=latest)](https://crail.readthedocs.io/en/latest/?badge=latest)

# Crail

Crail is a fast multi-tiered distributed storage system designed from ground up for high-performance network and storage hardware.
It marks the backbone of the Crail I/O architecture, which is described in more detail on [craillabs.github.io](http://craillabs.github.io). 
The unique features of Crail include:

* Zero-copy network access from userspace
* Integration of multiple storage tiers such DRAM, flash and disaggregated shared storage
* Ultra-low latencies for both meta data and data operations. For instance: opening, reading and closing a small file residing in the distributed DRAM tier less than 10 microseconds, which is in the same ballpark as some of the fastest RDMA-based key/value stores
* High-performance sequential read/write operations: For instance: read operations on large files residing in the distributed DRAM tier are typically limited only by the performance of the network
* Very low CPU consumption: a single core sharing both application and file system client can drive sequential read/write operations at the speed of up to 100Gbps and more
* Asynchronous API leveraging the asynchronous nature of RDMA-based networking hardware
* Extensible plugin architecture: new storage tiers tailored to specific hardware can be added easily

Crail is implemented in Java offering a Java API which integrates directly with the Java off-heap memory. Crail is designed for performance critical temporary data within a scope of a rack or two.

## Documentation

For information about how to deploy, run, test and program against Crail:
* Refer to https://crail.readthedocs.org
* Or build from source by running `make html` in `/doc` and opening `/doc/build/html/index.html`

## Community

Feel free to create pull requests or issues.

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