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diff --git a/doc/book/src/intro.md b/doc/book/src/intro.md index 5455ae71..ec77036f 100644 --- a/doc/book/src/intro.md +++ b/doc/book/src/intro.md @@ -10,17 +10,17 @@ To promote better data management policies, with focused on the following desira - **Self-contained & lightweight**: works everywhere and integrates well in existing environments to target hyperconverged infrastructures - **Highly resilient**: highly resilient to network failures, network latency, disk failures, sysadmin failures - **Simple**: simple to understand, simple to operate, simple to debug - - **Internet enabled**: Made for multi-sites (eg. datacenter, offices, etc.) interconnected through a regular internet connection. + - **Internet enabled**: made for multi-sites (eg. datacenter, offices, etc.) interconnected through a regular internet connection. We also noted that the pursuit of some other goals are detrimental to our initial goals. The following have been identified has non-goals, if it matters to you, you should not use Garage: - - **Extreme performances**: high performances constrain a lot the design and the deployment. We always prioritize - - **Feature extensiveness**: Complete implementation of the S3 API - - **Storage optimizations**: Erasure coding (our replication model is simply to copy the data as is on several nodes, in different datacenters if possible) - - **POSIX/Filesystem compatibility**: We do not aim at being POSIX compatible or to emulate any kind of filesystem. Indeed, in a distributed environment, such syncronizations are translated in network messages that impose severe constraints on the deployment. + - **Extreme performances**: high performances constrain a lot the design and the infrastructure; we seek performances through minimalism only. + - **Feature extensiveness**: complete implementation of the S3 API or any other API to make garage a drop-in replacement is not targeted as it could lead to decisions impacting our desirable properties. + - **Storage optimizations**: erasure coding or any other coding technique both increase the difficulty of placing data and synchronizing; we limit ourselves to duplication. + - **POSIX/Filesystem compatibility**: we do not aim at being POSIX compatible or to emulate any kind of filesystem. Indeed, in a distributed environment, such syncronizations are translated in network messages that impose severe constraints on the deployment. -## Integration in environments +## Supported and planned protocols Garage speaks (or will speak) the following protocols: @@ -36,9 +36,9 @@ We plan to add logic to Garage to make it a viable solution for email storage. Especially, it is used to host their main website, this documentation and some of its members's blogs. Additionally, Garage is used as a [backend for Nextcloud](https://docs.nextcloud.com/server/20/admin_manual/configuration_files/primary_storage.html). Deuxfleurs also plans to use Garage as their [Matrix's media backend](https://github.com/matrix-org/synapse-s3-storage-provider) and has the backend of [OCIS](https://github.com/owncloud/ocis). -*Are you using Garage? Open a pull request to add your organization here!* +*Are you using Garage? [Open a pull request](https://git.deuxfleurs.fr/Deuxfleurs/garage/) to add your organization here!* -## Comparisons to existing software +## Comparison to existing software **[Minio](https://min.io/) :** Minio shares our *self-contained & lightweight* goal but selected two of our non-goals: *storage optimizations* through erasure coding and *POSIX/Filesystem compatibility* through strong consistency. However, by pursuing these two non-goals, minio do not reach our desirable properties. @@ -46,17 +46,26 @@ First, it fails on the *simple* property: due to the erasure coding, minio has s Second, it fails on the *interned enabled* property: due to its strong consistency, minio is latency sensitive. Furthermore, minio has no knowledge of "sites" and thus can not distribute data to minimize the failure of a given site. -**[Openstack Swift](https://docs.openstack.org/swift/latest/)** +**[Openstack Swift](https://docs.openstack.org/swift/latest/) :** OpenStack Swift at least fails on the *self-contained & lightweight* goal. Starting it requires around 8Gb of RAM, which is too much especially in an hyperconverged infrastructure. It seems also to be far from *Simple*. -**[Pithos](https://github.com/exoscale/pithos)** -Pithos has been abandonned and should probably not used yet, in the following we explain why we did not pick their design. -Pithos was relying as a S3 proxy in front of Cassandra (and was working with Scylla DB too). -From its designers' mouth, storing data in Cassandra has shown its limitations justifying the project abandonment. -They built a closed-source version 2 that does not store blobs in the database (only metadata) but did not communicate further on it. -We considered there v2's design but concluded that it does not fit both our *Self-contained & lightweight* and *Simple* properties. It makes the development, the deployment and the operations more complicated while reducing the flexibility. +**[Ceph](https://ceph.io/ceph-storage/object-storage/) :** +This review holds for the whole Ceph stack, including the RADOS paper, Ceph Object Storage module, the RADOS Gateway, etc. +At is core, Ceph has been designed to provide *POSIX/Filesystem compatibility* which requires strong consistency, which in turn +makes Ceph latency sensitive and fails our *Internet enabled* goal. +Due to its industry oriented design, Ceph is also far from being *Simple* to operate and from being *self-contained & lightweight* which makes it hard to integrate it in an hyperconverged infrastructure. +In a certain way, Ceph and Minio are closer togethers than they are from Garage or OpenStack Swift. -**[IPFS](https://ipfs.io/)** -*Not written yet* +*More comparisons are available in our [Related Work](design/related_work.md) chapter.* + +## Community + +If you want to discuss with us, you can join our Matrix channel at [#garage:deuxfleurs.fr](https://matrix.to/#/#garage:deuxfleurs.fr). +Our code and our issue tracker, which is the place where you should report bugs, are managed on [Deuxfleurs' Gitea](https://git.deuxfleurs.fr/Deuxfleurs/garage). + +## License + +Garage, all the source code, is released under the [AGPL v3 License](https://www.gnu.org/licenses/agpl-3.0.en.html). +Please note that if you patch Garage and then use it to provide any service over a network, you must share your code! |