Solid State Drives (SSD): Low-power use, highly-reliable and high performance
New Solid State Drives (SSD) are starting to replace conventional disk drives. They use semi-conductor memory to store data. Importantly they contain no motors or moving parts and are characterized by much higher speed read/write access and reduced power consumption.
Because of the use of semi-conductor memory, SSD provide astonishingly high levels of random access performance compared with
even top-end 15,000rpm disk drives. They benefit applications with high random access requirements such as databases.
In addition, with no motors or moving parts they have higher reliability than disk drives.
This means that SSD is ideal for Tier0 storage use. This improves storage layer optimization in systems that use Information
Lifecycle Management (ILM). (Tier 1: Online disk drives, Tier 2: Nearline disk drives, Tier3: LTO Ultrium drives, archive)
The SSD used in ETERNUS
The SSD used in ETERNUS has enterprise class performance and reliability.
While maintaining compatibility with traditional disk drives, it allows low power operation at very high-speeds.
For concerns about flash memory rewrites, SSD in ETERNUS extends using SLC (*Note 1) type flash memory (*Note 2), Error Correcting
Code (ECC (*Note 3)) and a wear leveling function (*Note 4).
In addition, data high-reliability is also protected by ECC inside the SSD.
If a power failure occurs SSD in ETERNUS can move any data in the volatile memory of the SSD (high-speed DRAM cache) to the
flash memory and ensure a safe system halt.
*Note 1: SLC (Single Level Cell)
A cell whose number of memory bits is one.
*Note 2: Flash memory
Non-volatile memory supports write and deletion at high-speed. It is suited to large volume operation.
*Note 3: ECC (Error Correcting Code )
Redundant data added when requesting data in order to detect and correct errors in the original data.
*Note 4: Wear leveling function
This function levels (or evenly distributes) the number of writes to flash memory. Typically continuous data write/delete
deteriorates cells and ends up with no data witten to the cells. The wear leveling function by eliminating wirte/delete concentration
to a specific block avoids failures caused by SSD rewrites.
Product Requirements
| Supported Disk Drives | ETERNUS DX80, ETERNUS DX400 series, DX8000 series, ETERNUS4000, ETERNUS8000 |
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