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# Table of Contents
1. Disk Filesystems - [video](https://youtu.be/kD3A_vpVfNk) - [slides](https://www.slideshare.net/PranithKarampuri/glusterfs-session-1-disk-filesystems)
This session covers the concepts of disk filesystems that are important to understand glusterfs.
2. 1 Layer above Disk Filesystems(Posix) - [video](https://youtu.be/eNoargRqOHQ) - [slides](https://www.slideshare.net/PranithKarampuri/glusterfs-session-2-1-layer-above-disk-filesystems)
This session covers how posix xlator converts File Operations(FOPs) in glusterfs to system calls on the underlying disk filesystems.
Following internal data structures are discussed as part of the session.
- inode_t
- dentry_t
- fd_t
3. Xlator interface - [video](https://youtu.be/EnYAzpR336I) - [slides](https://www.slideshare.net/PranithKarampuri/gluster-dev-session-3-xlator-interface)
This session covers xlator interface in glusterfs which is how all functionality/modules are divided into in glusterfs.
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