Demystifying DHT in GlusterFS

1. Demystifying DHT in GlusterFS
Ankit Raj
anraj@redhat.com

2. ●Why we need distributed file
system...?
Storing and accessing files in a client/server architecture.
● Uses multiple servers to store data and use multiple clients
(local or remote).
● Organizes and displays files and directories from multiple
servers as if they were
● stored in your local system.
● It is easier to distribute documents to multiple clients, provide a
centralized storage
● system
● Client machines are not using their resources to store the data.

3. Terminology
● Bricks
● Volume
● Node
● Translator
● Trusted pool storage
● volfile

4. Why DHT?
● Why we use distributed hash model for
glusterfs

5. How DHT solve your problem?
● Will describe it’s internal working

6. DHT fops
● Mkdir
● Create
● Lookup
● Lookup-selfheal
● Rmdir
● Read
● Rename
● Unlink

7. Managing Scalability in GlusterFS
● Expand volumes
● Rebalance
● How rebalance works:
● Shrink volumes
● Replace brick

8. ● Q&A