Dell
Other new features of the 6Gb/s SAS controllers will offer improved signal integrity and additional safeguards to enhance data protection with support for SED
Table 2. 6Gb/s SAS (SAS 2.0) Features
| |
| Server Storage |
|
|
6Gb/s Throughput | |
|
|
3Gb/s Compatible | |
|
|
Standard | |
and |
|
|
|
DFE (Decision Feedback Equalization) | |
improved signaling |
|
|
|
SSC (Spread Spectrum Clocking) reduced | |
radiated emissions |
|
|
|
Enhanced Security with SED (Self- | |
Encrypting Drive) support |
|
|
|
Improved Scalability | |
|
|
2.2.16Gb/s SAS Performance Benefit over 3Gb/s SAS
In small disk drive configurations (one to eight drives) the aggregate media rate of the disks (the speed at which the disk heads can read and write data) become the bottleneck for storage throughput. As business storage needs grow, IT centers can add more disk drives to their storage infrastructure, and the latest generation of SAS allows server performance to scale past the 3Gb/s SAS performance limitations: from 2.4 GB/s to 4.8 GB/s unidirectional.
Table 3. SAS Performance Details
SAS Generation | Approximate number of SAS | |
| Interface | HDDs required saturate |
| ||
|
| bandwidth (RAID 0) |
|
|
|
1.0 (3Gb) | 1.0 | 8 to10 |
|
|
|
2.0 (6Gb) | 2.0 | 16 to 20 |
|
|
|
In addition to the improvements in the SAS bandwidth, PCI Express 2.0 provides double the system-
2.2.26Gb/s SAS Expectation
RAID controllers employing 6Gb/s SAS technology excel in both high IOP and high bandwidth applications. Applications and environments that benefit most range from traditional data center applications (such as random IOPs intensive email, web and database servers) to streaming and archival applications that will benefit from improved sequential read and write throughput. This means more users, more video streams, more email accounts, and faster backups are now possible.
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