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====== Learnexa Storage Solution ======

===== Current Production Setup =====

We currently have a single node GlusterFS solution, which has network bandwidth cap of 1Gbps and cannot scale up unless we add a few more nodes or find a better a better storage solution.

===== Requirement(s) =====

- High Performance (I/O Performance - Read and Write)
  - Distributed (File stored across storage nodes)
  - Fault-Tolerant (Client should survive a Storage Node Failure)

==== Known Technical Limitations ====

* Please note that not all DFS offer Direct parallel access to Filesystem and Network access. Even it does its not easy to manage or maintain the storage solution.

==== Solutions Available ====

* GlusterFS
  * BeeGFS
  * MapR-FS

A solution which can be considered for future storage needs is Amazon EFS. Amazon EFS is still in preview state when this wiki was created.

===== GlusterFS (Gluster File System) =====

GlusterFS seems to be a good overall solution, because of the following reasons;

- Fault Tolerance
      * if its configured to work in Distributed-Replicated (or similar to RAID10) configuration which requires at-least 4 nodes.
  - Scales up better 
      * Its better than traditional NFS solution as it uses server's internal storage.
  - Self-Healing capabilities
      * allow automatic rebalancing of data once failed node recovers.
  - Works with any common NFS version 3 client.
  - Easy to manage.

What GlusterFS lacks?

- Even though GlusterFS is a parallel filesystem, Gluster clients cannot speak parallel to all the servers at once, which adds a network bottle neck.
  - GlusterFS is based on technology similar to Rsync over NFS, hence it depends on underlying Translator, which auto-balances data across nodes.
  - GlusterFS depends purely on how the underlying Filesystem is configured.
  - Though its easy to manage, it is difficult to monitor client side failures.
  - Performance is lower that BeeGFS and Mapr-FS

For More FAQ's please visit: http://www.gluster.org/community/documentation/index.php/GlusterFS_Technical_FAQ

===== BeeGFS/FhGFS Parallel File System =====

BeeGFS/FhGFS seems to be a good solution for performance, because of the following reasons;

- Network and Storage Performance
       *  Scales up both in storage and network performance as and when new nodes are added.
  - Requires special client module, which is easy to configure.
  - Gives better performance similar to Mapr.
  - Easy to manage, better monitoring capabilities and comes with excellent administrative tools.

What BeeGFS lacks?

- Does not have auto self-healing and Proper Fault-tolerance

===== Mapr-FS (HDFS - Hadoop Distributed File System) =====

MAPR-FS seems to be a good overall for performance and storage, because of the following reasons;

- Network and Storage Performance
       *  Scales up both in storage and network performance as and when new nodes are added.
  - Performance is similar to BeeGFS.
  - Fault Tolerant and allows replicated sets to be spread across what’s called data nodes.

What MapR-FS lacks?

- Licensed based, only one node can be added part of community version.
  - No proper mounting capability
  - Does not show disk utilization over NFS.
  - Difficult to manage, its more like Tomcat application and hence need Java runtime environment.

==== Final Solution AWS S3 ====

We have tested the S3 performance on AWS and we found it to be efficient and highly available.

Here are some statistics;

<code>
1073741824 bytes (1.1 GB) copied, 9.97808 s, 108 MB/s
4294967296 bytes (4.3 GB) copied, 37.887 s, 113 MB/s
</code>

We have reached the maximum of Gigabit speed on S3 similar to HDFS (though not limited to Bandwidth of our Storage Server)

Note : The performance is dependent on the type of Instance used, the above test was done on c1.xlarge machine.

====== Suggested Solution (Obsolete) ======

* We have to go for mixed solution, Application software usually keeps 2 copies of media files, 
  * We can place application data (including recording and streaming) on GlusterFS and BeeGFS will handle recording and streaming (a copy of the same).
  * Else we can have multiple GlusterFS nodes for short term until Amazon EFS is ready for production use (which is our ultimate solution - Includes auto-burst rate).

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