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    <p>I'm not sure your list is quite correct. It depends on what you mean by a file system.</p> <p>If you mean a file system that is mountable in an operating system and usable by any application that reads and writes files using POSIX calls, then GridFS doesn't really qualify. It is just how MongoDB stores BSON-formatted objects. It is an <a href="http://www.storage-switzerland.com/Blog/Entries/2012/11/30_What_Is_Object_Storage.html" rel="nofollow noreferrer">Object system</a> rather than a File system.</p> <p>There is <a href="http://www.coffeepowered.net/2010/02/24/serving-files-out-of-gridfs-part-2/" rel="nofollow noreferrer">a project</a> to make <a href="https://github.com/mikejs/gridfs-fuse" rel="nofollow noreferrer">GridFS mountable</a>, but it is a little weird because GridFS doesn't have concepts for things like hierarchical directories, although paths are allowed. Also, I'm not sure how distributed writes on gridfs-fuse would be.</p> <p>GlusterFS and Ceph are comparable and are distributed, replicable mountable file systems. You can <a href="https://web.archive.org/web/20140825075146/http://hekafs.org/index.php/2013/01/ceph-notes/" rel="nofollow noreferrer">read a comparison between the two here</a> (and <a href="https://web.archive.org/web/20140330145402/http://hekafs.org/index.php/2013/01/update-on-ceph-vs-glusterfs/" rel="nofollow noreferrer">followup update of comparison</a>), although keep in mind that the benchmarks are done by someone who is a little biased. You can also watch <a href="http://www.youtube.com/watch?v=JfRqpdgoiRQ" rel="nofollow noreferrer">this debate on the topic</a>.</p> <p>As for HekaFS, it is GlusterFS that is set up for cloud computing, adding encryption and multitenancy as well as an administrative UI. </p>
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    1. COthanks for your great explanations and comments. you are right, i was not quite correct with the term file system. i am ok with something object system like as long as there are ways to deliver the files directly from a webserber. that's where [nginx-gridfs](https://github.com/mdirolf/nginx-gridfs) comes into play. works great for me. i have the feeling that glusterfs and ceph are much more difficult to setup and configure
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    2. CONote that ceph has several aspects: `rados` is the underlying object-storage, quite solid and libraries for most languages; `radosgw` is an S3/Swift compatible system; `rbd` is a shared-block-storage (similar to iSCSI, supported by KVM, OpenStack, and others); CephFS is the POSIX-compliant mountable filesystem.
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