推 VCLee10:推!!! 11/01 01:57
SATA=更好的硬碟效能? 不見得
SATA發展的幾個重點在於，
提供比PATA更大的頻寬，以供大量傳輸之用(Raid)
更細的排線，更優的對流，多硬碟環境尤其明顯，排線最長可達1M
更低的訊號電壓
提供Hot swap熱插拔功能
還有一些奇奇怪怪的技術
(Native Command Queuing(NCQ)；Enclosure Management；Port Multiplier；)
Serial(序列式) 比Parallel(平行式) 的傳輸更有效率
提供一個低價位的Raid系統選擇
缺點在於
現行排線和接口的機械強度不夠
多工性能不佳
沒有SCSI聰明 XD
以上的優點通通不針對一般老百姓，因為沒有這些你還是用的好好的
硬碟要快，
第一就是單碟容量(磁錄密度)
也就是一般人為什麼換了新硬碟會明顯感覺變快
以前單碟40G 80G的跟現在動輒 130G 160G的單碟容量差太多了
另一個就是硬碟上一些哩哩扣扣的晶片效能，日立就是這方面的強者
NCQ的增益? 有啦，不大就是。不會讓你驚為天人
至於高轉速，一般人通常不會使用，就不管了
所以說，頻寬大是沒有用的，他跟系統效能的依存性可以說是沒有
至於有人提到頻寬大，消耗系統效能低。
消耗的主因是跟南橋的設計跟硬碟晶片的設計有關。跟SATA頻寬一點關係也沒有
就算現在SATA2 的頻寬只有100MB/s 一般使用者使用起來完全沒有差別
讀寫最快的梭魚10 720GB 也才80出頭........
以下是SATA的一些簡介就是
https://www.sata-io.org/
Benefits of using SATA
What is SATA?
SATA is an evolutionary replacement for the Parallel ATA physical storage
interface. SATA is scalable and allows for enhancements to the computing
platform. These include easier integration, faster performance, and more
efficient design.
How will the industry benefit from adopting SATA?
Adoption of the Serial ATA specification provides low cost storage for the
industry, improved speed and bandwidth, and serves as an evolutionary
replacement for the Parallel ATA interface. Implementation of Serial ATA
allows for easy integration due to improved cabling, greater flexibility in
regard to system configuration and hot plugability. With these enhancements,
system builders can create new solutions with fewer limitations and will
experience greater interoperability with other interfaces.
What are the end user benefits of SATA?
End users will benefit by being able to easily upgrade their storage devices.
Configuration of SATA devices will be much simpler, with many of today's
requirements on jumper and settings no longer needed. Advancements in the
SATA specifications also allow improvements and scalability in performance
for the storage interface.
What are the IT management benefits of using SATA?
SATA provides:
‧ Enhanced performance (faster transfer rate and NCQ)
‧ Enhanced reliability (expanded CRC and latching connectors)
‧ System integration flexibility
What are the System Integrator benefits of using SATA?
SATA provides:
‧ Easier system build-up
‧ Simplified cabling
‧ Elimination of jumpers
‧ Improved overall system airflow
‧ Enhanced reliability
How does the end-user benefit from using SATA technology in servers and NAS?
User benefits for servers and NAS include:
‧ Hotplug/backplane
‧ Enclosure management
‧ Interoperability with SAS
‧ Backward compatibility with various speeds
‧ Higher performance
‧ Ease of integration – no more jumpers
‧ Improved air flow
How does the system vendor benefit from using SATA technology in servers and
NAS?
Benefits for the OEM include:
‧ Easier configuration and design with cables that are thinner, have smaller
connectors, and are simpler to route and install
‧ Ability to use HDD technology across multiple segments such as desktops,
entry and midrange servers, and networked storage
‧ Easier training for Sales and Tech Support staff
‧ Improved silicon design with lower voltage that will ease current design
requirements in Parallel ATA
‧ Hot plugging and delayed spin-up are other features well suited to
multi-drive systems.
Does SATA provide better performance than Parallel ATA?
Serial ATA supports data rates up to 150 MB/s, versus the embraved industry
standard of 100 MB/s for Parallel ATA. The new interface also provides for
command queuing to further boost system performance.
What is the long-term road map for SATA?
SATA defines a roadmap starting at 1.5 gigabits per second (equivalent to a
data rate of 150MB/s) and migrating to 3.0 gigabits per second (300 MB/s),
then to even higher data rates. This roadmap supports up to 10 years of
storage evolution, based on historical trends.
How does SATA handle backward compatibility issues?
SATA supports legacy drivers for Parallel ATA. OEMs can deploy SATA today
using existing parallel ATA drivers. Several vendors currently supply bridges
for parallel-to-serial conversion for legacy devices.
Are there any known interoperability issues with SATA?
One of the primary requirements of the SATA 1.0 specification was to maintain
backward compatibility with existing operating system drivers to eliminate
incompatibility issues.
How will operating systems handle SATA?
Because of the legacy support inherent in the specification, operating
support will be simplified. The SATA specification allows for additional
features to be added to applications. Additional features will be subject to
normal driver validation processes.
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