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RAID Jargon - RAID to ROC

I hope you find this glossary useful. Even I get confused sometimes by the new words that vendors throw at me.

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RAID Redundant Array of Inexpensive Disks. In the 1980's when this term was originated, by IBM, you could buy 2 types of disk drives, either low cost drives such as used in the average PC, or high speed high performance drives as used in digital video effects systems or mainframes. Because of the larger market for PC disks, they eventually became the technology drivers and effectively killed off the higher cost alternatives. However the original concept remains valid. You can create a disk array which looks electronically just like a bigger ordinary disk, by attaching a bunch of disks working in parallel and connected to a RAID controller interface.

The combined system can be programmed to provide desirable characteristics such as faster data throughput (for example a 4 disk wide system could have a data throughput capability 4 times faster than a single disk). RAID can also provide fault tolerance, because redundant disks can be added into the array and the data split up in such a way that there is no loss of performance or data ability if any single disk fails. However, RAID doesn't speed up access time, which is why some applications also use solid state disks.

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RAIGE RAID Across Independent Gigabit Ethernet) is a creation of Pivot3 although some of concepts sound similar to how Google implements its internal storage infrastructure.

RAIN Redundant Array of Independent Nodes is an Adaptec creation

RAISE Redundant Array of Independent Silicon Elements is a term invented by SandForce. Their SSD controller uses this protection scheme inside 1.8" and 2.5" SSDs.

RDMA Remote Direct Memory Access (over over TCP/IP, Ethernet and other networks). RDMA technology enables high-performance server clustering and eliminates the burden of excessive memory copies when communicating between servers.

...from a press elease by Neterion

RLDRAM Reduced Latency DRAM. Designed specifically for use in high-speed networking and fast cache applications, RLDRAM is an ultra-high speed Double Data Rate (DDR) SDRAM that combines fast, random access with extremely high bandwidth and high density.

...from a featured press release by Infineon Technologies

ROC RAID on Chip storage chips

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