Serial Ata Baru!

[potong 0]

raid ni utk backup kan?

iaitu buat duplicate/copy satu2 fail kat tempat lain.

so in terms of speed, lbh sesuai klu bandingkan sata, pata dan scsi.

RAID (redundant array of independent disks; originally redundant array of inexpensive disks) is a way of storing the same data in different places (thus, redundantly) on multiple hard disks. By placing data on multiple disks, I/O operations can overlap in a balanced way, improving performance. Since multiple disks increases the mean time between failure (MTBF), storing data redundantly also increases fault-tolerance.

kelajuan plak lbh byk bergantung kpd bandwidth (Mb/s) drpd rpm, dgn teknologi yg lbh advanced mcm sata support lbh speed drpd pata.

btul tak mcm tu?

[izzo_argastra 0]

RAID x semestinya utk backup...semua bergantung kepada jenis RAID yg ko setkan...utk desktop PC, biasanya ader RAID 0, 1 dan 0+1....utk backup pilih RAID 1....ni list die aku copy dari site lain:

RAID-0

RAID Level 0 is not redundant, hence does not truly fit the "RAID" acronym. In level 0, data is split across drives, resulting in higher data throughput. Since no redundant information is stored, performance is very good, but the failure of any disk in the array results in data loss. This level is commonly referred to as striping.

RAID-1

RAID Level 1 provides redundancy by writing all data to two or more drives. The performance of a level 1 array tends to be faster on reads and slower on writes compared to a single drive, but if either drive fails, no data is lost. This is a good entry-level redundant system, since only two drives are required; however, since one drive is used to store a duplicate of the data, the cost per megabyte is high. This level is commonly referred to as mirroring.

RAID-2

RAID Level 2, which uses Hamming error correction codes, is intended for use with drives which do not have built-in error detection. All SCSI drives support built-in error detection, so this level is of little use when using SCSI drives.

RAID-3

RAID Level 3 stripes data at a byte level across several drives, with parity stored on one drive. It is otherwise similar to level 4. Byte-level striping requires hardware support for efficient use.

RAID-4

RAID Level 4 stripes data at a block level across several drives, with parity stored on one drive. The parity information allows recovery from the failure of any single drive. The performance of a level 4 array is very good for reads (the same as level 0). Writes, however, require that parity data be updated each time. This slows small random writes, in particular, though large writes or sequential writes are fairly fast. Because only one drive in the array stores redundant data, the cost per megabyte of a level 4 array can be fairly low.

RAID-5

RAID Level 5 is similar to level 4, but distributes parity among the drives. This can speed small writes in multiprocessing systems, since the parity disk does not become a bottleneck. Because parity data must be skipped on each drive during reads, however, the performance for reads tends to be considerably lower than a level 4 array. The cost per megabyte is the same as for level 4.

Summary:

RAID-0 is the fastest and most efficient array type but offers no fault-tolerance.

RAID-1 is the array of choice for performance-critical, fault-tolerant environments. In addition, RAID-1 is the only choice for fault-tolerance if no more than two drives are desired.

RAID-2 is seldom used today since ECC is embedded in almost all modern disk drives.

RAID-3 can be used in data intensive or single-user environments which access long sequential records to speed up data transfer. However, RAID-3 does not allow multiple I/O operations to be overlapped and requires synchronized-spindle drives in order to avoid performance degradation with short records.

RAID-4 offers no advantages over RAID-5 and does not support multiple simultaneous write operations.

RAID-5 is the best choice in multi-user environments which are not write performance sensitive. However, at least three, and more typically five drives are required for RAID-5 arrays.

[encik pot pet 0]

en izzo_argastra

boleh tak anda awak paste sekali url untuk article yg awak copy tu

semoga semua orang memperoleh manfaat..

thanx

[izzo_argastra 0]

en izzo_argastra

boleh tak anda awak paste sekali url untuk article yg awak copy tu

semoga semua orang memperoleh manfaat..

thanx   

boley, tapi aku x sure site mane satu aku copy tu...anyway ader alternative site lain...harap dpt manfaat hendakNya..

tekan SINI dan SINI

[topeiRa 0]

Ya ya.. aku punya monitor bukan touch screen ek.. tekan tak jadi apa2.. uhhuehuehuhuehue.. merapu merapu..

[izzo_argastra 0]

what the..... ......silap forum ke?

[MalaysianSecurityForce 0]

He he he... aku baru je berbincangan nga pakar2 MSF pasai serial ata 2 ni. Sbnrnya, hdd skrg x mampu pn utk gunakan kelajuan serial ATA skrg ni dgn baik. so, serial ATA 2 ni, kira membazir je. itu pendapat aku laaa.. bdasarkan max burst rate hdd skrg ni (max around 80MB-100MB/s je).RAID blh utilize bancwith ATA skrg ni dgn baik, tp ATA 2 ti melampau sgt bandwithnya.

Pakar2 MSF plak ader pdapat lain. ATA 2 ni bkn di design utk kegunaan home user mcm kiter ni. ATA 2 ni, ader applikasi lain di industri yg memerlukan GILER BABI bandwith, dn salah satu projek diorang mmg memerlukan bandwith hdd yg begitu.

Ni just utk makluman korang je laaa...

[izzo_argastra 0]

Desktops, Mobile PCs, and Consumer Electronics

What is Serial ATA and why is it being developed?

Serial ATA is an evolutionary replacement for the Parallel ATA physical storage interface. Serial ATA is scalable and will allow future enhancements to the computing platform.

Previous efforts to transition to a serial bus were not successful. Why do you believe that Serial ATA will be successful?

Serial ATA is a drop-in solution in that it is compatible with today's software, which will run on the new architecture without modification. It will provide for systems which are easier to design, with cables that are simple to route and install, smaller cable connectors, improve silicon design, and lower voltages which alleviate current design requirements in Parallel ATA.

Will there still be a parallel ATA bus when Serial ATA comes out?

Serial ATA's adoption by the industry will follow a phased transition path. There will be a point where both Parallel and Serial ATA capabilities are available.

You stated that PCs implementing Serial ATA will be in the marketplace in 2002. Why does it take so long to implement?

The goal of the working group is to ensure the Serial ATA transition happens as smoothly and quickly as possible. The Serial ATA specification is expected to be complete in the fall of 2000 with adoption to happen in the following 12 to 18 months.

What are the end user benefit of Serial ATA?

End users will benefit by being able to easily upgrade their storage devices. Configuration of Serial ATA devices will be much simpler, with many of today's requirements on jumper and settings no longer needed.

What is the cost to implement Serial ATA in a system?

The cost of Serial ATA technology will be on par with today's Parallel ATA technology.

Who are the members of the Serial ATA Working Group? Can new companies join?

The Serial ATA promoters group includes APT Technologies Inc, Dell Computer Corporation, International Business Machines, Intel Corporation, Maxtor Corporation, Quantum Corporation, and Seagate Technology. Information on joining the working group is available at www.serialata.org and new members are welcome.

Hard disk data rates don't seem to be pushing the limits of current ATA66 technology. Why is Serial ATA being planned now?

Serial ATA is an evolutionary replacement for the Parallel ATA physical storage interface and will allow future enhancements to the computing platform. Specifically, the thinner Serial ATA cable addresses OEM's concerns regarding airflow around the Parallel ATA cable, and enables design of smaller PC chassis, as well as silicon vendors concerns regarding 5 volt tolerance support in future designs.

Will Serial ATA be compatible with today's PCs?

Serial ATA electronics and connectors will differ from Parallel ATA, however the technology is software compatible and OS transparent. It is anticipated that there will be adapters to facilitate forward- and backward-compatibility of hard disks on PC systems.

What is the impact of Serial ATA on OEMs?

Industry benefits of Serial ATA include systems which are easier to design with cables that are simple to route and install, smaller cable connectors with improved silicon design, lower voltage which alleviates current design requirements in Parallel ATA and compatibility with today's software which will run on the new architecture without modification.

Beyond hard disks, will Serial ATA be used on floppy drives, optical drives, DVDs, and ZIP drives?

Serial ATA supports all ATA and ATAPI devices, including CDs, DVDs, tapes devices, high capacity removeable devices, zip drives, and CDRW's.

What is the impact of Serial ATA on IEEE1394 (aka Firewire) and on USB2 in terms of PC system function?

Serial ATA now supports connectors and cable which enable external drives or storage systems to be connected to a host PC. Because Serial ATA is a native drive interface, the Serial ATA solutions are less expensive, and because of the faster interface speeds, they will be higher performance than USB or IEEE1394. External Serial ATA connectors are intended only for storage device connections, however, while USB and IEEE1394 support a variety of perhipherals other than storage.

When does Microsoft plan to support Serial ATA in its OS's?

Serial ATA is software compatible with Parallel ATA and requires no changes to Microsoft operating systems, or any other OS as well.

What are the licensing requirements and costs of Serial ATA to companies that want to use the technology?

When the Serial ATA specification is complete, it will be made available at no charge. The working group expects to complete the specification later this year.

Servers and Networked Storage

What is Serial ATA?

Serial ATA is a disk-interface technology developed by a group of the industry's leading vendors to replace parallel ATA. The group is known as the Serial ATA Working Group. The Serial ATA 1.0 specification was released in August 2001.

What are the compelling reasons why Serial ATA is a viable option for server and NAS networked storage?

Scalability—Serial ATA is a point-to-point connection and allows multiple ports to be aggregated into a single controller that is typically located either on the motherboard or as an add-in, RAID card. Through backplanes and external enclosures, Serial ATA will be deployed in high-capacity server and networked-storage environments.

Price—Serial ATA was created, with desktop prices in mind, as a replacement for Parallel ATA. Initial hard disk drives (HDD's) are expected to be priced competitively for the desktop. With the scalable features of Serial ATA combined with desktop price-points, greater storage capacity may be realized at a lower total solution cost than with traditional server and networked storage.

Cabling—Serial ATA specifies a thin, point-to-point connection which allows for easy cable routing within a system. This avoids master/slave, "daisy-chaining", and termination issues. Also, better airflow can be realized compared to systems with wider ribbon cables.

Performance—Serial ATA technology will deliver 1.5 Gbps (150 MB/sec) of performance to each drive within a disk drive array.

When will Serial ATA infrastructure products be shipping in volume?

Individual vendors will best be able to advise on product plans. However, hard disk drives, cables, enclosures, and controllers are expected to be available to OEM and channel customers in 2002, with enterprise system vendors shipping platforms with Serial ATA storage by the second half of the year.

Where is Serial ATA positioned relative to other interface technologies?

Serial ATA technology provides a new serial interconnect designed to change the way vendors develop storage systems. The first deployments, where price is an important issue, are intended for entry-level servers and network-attached storage. As the infrastructure continues to develop, Serial ATA will penetrate into higher-end servers and more complex storage systems.

What is the long-term road map for Serial ATA?

Serial ATA 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 6.0 gigabits per second (600 MB/s). This roadmap supports up to 10 years of storage evolution, based on historical trends.

How does Serial ATA handle backward compatibility issues?

Serial ATA supports legacy drivers for Parallel ATA. OEMs can deploy Serial ATA, today, using existing parallel ATA drivers. Vendors intend to supply bridges for parallel-to-serial conversion for legacy devices.

Are there any known interoperability issues with Serial ATA?

One of the primary requirements of the Serial ATA 1.0 specification was to maintain backward compatibility with existing operating system drivers to eliminate incompatibility issues.

How will operating systems handle Serial ATA?

Because of the legacy support inherent in the specification, operating support will be simplified. The Serial ATA specification allows for additional features to be added to applications. Additional features will be subject to normal driver validation processes.

How does the end-user benefit from using Serial ATA technology in servers and NAS?

The end-user will benefit from lower cost, higher performance (via increased speed and scalability), and easier configuration. Serial ATA allows for higher performance while using existing, proven features such as 3.5" disk drives. Configuration of Serial ATA devices will eliminate many of today's requirements for jumpers and settings.

How does the system vendor benefit from using Serial ATA technology in servers and NAS?

Benefits for the OEM:

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 Compatibility with today's software that will enable Serial ATA to run on the new architecture without modification