Model 302/402: Added SSD

Additional HDFS storage for Limulus Hadoop Models 302 and 402

Increase the total amount of HDFS (Hadoop Distributed File System) storage for Limulus models 302 and 402. By default all four node Limulus Hadoop systems use a replication factor of two. This value can be changed at any time. The table provides the additional amount of usable HDFS storage using 2X replication.

Upgrade-Size	SSD-Size	Drives	Additional-Drives/Motherboard	Endurance	Usable-at-2X-Replication
4 TB	1 TB	4	1	600-TBW	2 TB
8 TB	2 TB	4	1	1200-TBW	4 TB
16 TB	4 TB	4	1	2400-TBW	8 TB

The upgrade includes four SSD drives (high endurance, V-NAND 3-bit MLC memory) that are inserted into the SSD drive cage on the front of the Limulus system. One drive is connected to each of the four internal motherboards. Drives come pre-configured and ready for insertion. The Ambari web interface is used to tell Hadoop HDFS about the new drives. This upgrade can be purchased with a Limulus system or in the future. It requires adding four SSD drives to the existing SSD cage.

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