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SAS is SCSI, it connects via a serial cable/connector instead of parallel (long and skinny) connector.
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Serial vs parallel processing?
It is less costly to design ever faster serial lines than to create and build the necessary circuitry to keep faster parallel channels properly aligned. This is why Parallel ATA and Parallel SCSI have migrated to Serial ATA (SATA) and Serial SCSI (SAS).
What is the difference between SCSI and SAS?
SCSI uses a parellel communication chain and SAS uses serial Point to Point communication
What is difference between ide sata and scsi hard disk?
For years the parallel interface has been widely used in storage systems. The need for increased bandwidth and flexibility in storage systems made the SCSI and ATA standards an inefficient option. A parallel interface is a channel capable of transferring date in parallel mode - that is transmitting multiple bits simultaneously. Almost all personal computers come with at least one parallel interface. Common parallel interfaces include SCSI and ATA. SCSI(sku4zē) Short for small computer system interface, a parallel interface standard used by Apple Macintosh computers, PCs and many UNIX systems for attaching peripheral devices to computers. Nearly all Apple Macintosh computers, excluding only the earliest Macs and the recent iMac, come with a SCSI port for attaching devices such as disk drives and printers. SCSI interfaces provide for data transmission rates (up to 80 megabytes per second). In addition, you can attach multiple devices to a single SCSI port, so that SCSI is really an I/O bus rather than simply an interface. ATA(Also known as IDE) is a disk drive implementation that integrates the controller on the disk drive itself. ATA is used to connect hard disk drives, CD-ROM drives and similar peripherals and supports 8/16-bit interface that transfer up to 8.3MB/s for ATA-2 and up to 100MB/s (ATA-6). So, what do parallel interfaces have to do with SAS (Serial Attached SCSI) and SATA (Serial ATA)? A lot, actually. It is the architectural limitations of the parallel interfaces that serial technologies like SAS and SATA address. In contrast to multiple parallel data stream, data is transmitted serially, that is in a single steam, by wrapping multiple bits into packets and it is able to move that single stream faster than parallel technology. Serial Attached SCSI (SAS)Abbreviated as SAS, Serial Attached SCSI, an evolution of parallel SCSI into a point-to-point serial peripheral interface in which controllers are linked directly to disk drives. SAS is a performance improvement over traditional SCSI because SAS enables multiple devices (up to 128) of different sizes and types to be connected simultaneously with thinner and longer cables; its full-duplex signal transmission supports 3.0Gb/s. In addition, SAS drives can be hot-plugged. Serial ATA (SATA) Often abbreviated as SATA, Serial ATA is an evolution of the Parallel ATA physical storage interface. Serial ATA is a serial link - a single cable with a minimum of four wires creates a point-to-point connection between devices. Transfer rates for Serial ATA begin at 150MB/s. Starting with SATA, it extends the capabilities of ATA and offers transfer rates starting at 150MB/s and, after years of development, has moved to the mainstream of disk interfaces. The successor the SCSI interface is SAS at speeds of up to 3Gb/s. Additionally, it also addresses parallel interface issues such as drive addressability and limitations on the number of device per port connection. SAS devices can communicate with both SATA and SCSI devices (the backplanes of SAS devices are identical to SATA devices). A key difference between SCSI and SAS devices is the addition in SAS devices of two data ports, each of which resides in a different SAS domain. This enables complete failover redundancy. If one path fails, there is still communication along a separate and independent path. Cables & Connectors Another big advantage of SATA over ATA is the cabling and connectors. The serial interface reduces the amount of wires needed to transmit data, making for much smaller cable size and making it easier to route and install SATA devices. The IDE cables used in parallel ATA systems are bulkier than Serial ATA cables and can only extend to 40cm long, while Serial ATA cables can extend up to one meter. In addition to the cabling, a new design of connectors is also used that reduces the amount of crosstalk between the wires, and the connector design also provides easier routing and better air flow. The Benefits of SAS & SATA in Storage Serial interfaces offer an improvement over older parallel SCSI (with a serial version) in storage applications and environments. These benefits include better performance, better scalability, and also better reliability as the parallel interfaces are at their limits of speed with reliable data transfers. SAS and SATA drives can also operate in the same environment while SCSI and ATA cannot. For example, using faster SAS drives for primary storage and offloading older data to cheaper SATA disks in the same subsystem, something that could not be achieved with SCSI and ATA.
What is the product range offered by Adaptec?
Adaptec offers SAS and SATA RAID Adapters, Hot Bus Adapters, cables and accessories such as: SAS HD cables, Serial Attached SCSI cables, flash and battery modules.
What are the advantages of using an SAS drive?
The advantage of using an SAS disk drive is that it SAS disk drives contain more space. They also improve the easy of maneuvering things around within files.
When s s c restart?
When a SAS controller restarts, it typically means that the SAS (Serial-attached SCSI) controller is being reset or power-cycled to resolve any potential issues or to apply configuration changes. This process can be initiated manually by an administrator or automatically by the system in response to certain events.
Why is it more expensive to add peripheral devices to a SCSI subsystem than IDE?
SCSI is a much less popular interface, and so production costs are higher (due to lower demand) It is also physically more expensive for the materials to produce them, as SCSI is a much larger interface with more, larger, and higher quality cable. In the case of SAS (Serially Attached SCSI) and fiberlink SCSI, these are also expensive to produce. IDE is the standard for desktop systems, and as such a lot more time and money has gone into making them cheaper and more available. Plus, IDE has now been discontinued in favor of SATA, making most IDE items go into clearance.
Does a SCSI have the fastest throughput?
It used to, but no longer. These days, for individual harddrives, SATAII and SATAIII (SATA3) are significantly better in performance. However in terms of total throughput performance, SCSI can outperform even SATAII. Here's a breakdown of common interfaces and their bandwidth: ATA/100 (IDE): 100 MB/s Ultra ATA/133 (IDE): 133 MB/s SATA: 150 MB/s SATAII: 300 MB/s SATAIII: 600 MB/s Ultra3 SCSI: 160 MB/s Ultra-320 SCSI: 320 MB/s Ultra-640 SCSI: 640 MB/s SAS (Serially Attached SCSI): 300 MB/s USB1.0: 1.5 MB/s USB2.0: 60 MB/s Firewire: 50 MB/s Firewire800: 400 MB/s 100mbit Ethernet: 12.5 MB/s Gigabit ethernet: 125 MB/s Average Cable Internet: 1 MB/s It should be noted, however, that the world's fastest harddrives do not max out most of these interfaces. An Atlas 3k (15,000 RPM) drive uses SAS, Ultra-320 and Ultra-640 interfaces, but tops out at 145 MB/s average with 202 MB/s peak. As such, whether to use SCSI or SATA is of no importance to standard users. Only servers and mainframes typically need to worry. That, combined with the MUCH higher cost of SCSI drives and SCSI interface cards (and cables) has left SCSI unpopular and largely obsolete.
If one pair of sides of a quadrilateral is parallel and congruent then the quadrilateral is a parallelogram?
== == yes. suppose the quad ABCD has AB and CD equal and parallel. Then the triangles ABC and CDA are congruent by SAS axiom; so the quad is a parallelogram
When did Australia send the first troops over to Iraq?
SAS commandos in 2002.
What is the birth name of Maxim Sas?
Maxim Sas's birth name is Maxim Sas.
List all relevant standard publish by Nigerian accounting standard board?
Sas 1 - statement of accounting policies sas 2 - information to be disclosed in financial statement sas 3 - accounting for property, plant and equipment sas 4 - accounting for stock(inventory) sas 5 - accounting for construction contract sas 6 - prior year, exceptional and extra-ordinary items sas 7 - currency conversion sas 8 - retirement benefit sas 9 - depreciation sas 10 - bank and non-bank financial institutions sas 11 - accounting for lease sas 12 - deferred taxation sas 13 - investment sas 14 - petroleum industry - down-stream sas 15 - bank and non-bank financial institutions (part 2) sas 16 - insurance sas 17 - petroleum industry - up-stream sas 18 - cashflow statement sas 19 - taxation sas 20 - abridge financial statement sas 21 - earnings per share other accounting statements have been issued in recent time
