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SCSI uses a parellel communication chain and SAS uses serial Point to Point communication

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Q: What is the difference between SCSI and SAS?
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What is the advantage of SAS over parallel SCSI?

SAS is SCSI, it connects via a serial cable/connector instead of parallel (long and skinny) connector.

What is the difference between messages and commands in scsi?

this is a parent director of FAQ for scsi.. might have to search abit but your answer may be there.

Difference between single ended scsi and differential scsi?

single ended scsi is a method of transmitting electrical signals over wires. one wire carries a varying voltage that represent a signal, while other wire is connected to a ground. single emded scsi cables are of 6m-1.3m long. Differential scsi is a method of transmitting information electrically by means of 2 complementary signal pairs sent on 2 separate wires.

What is the difference between sda and hda in Linux?

Historically, hda was used for IDE drives and SDA was used for SCSI drives. Today, regardless of physical interface, all drives are treated as SCSI devices.

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 is the difference between narrow SCSI and wide SCSI?

The wide SCSI-2 uses a wider data path & emdash;16 bit rather than the normal 8 bit & emdash; for the same 10 Mbps. Combining both fast and wide can, in theory, reach 20 Mbps.

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.

Why is there confusion about the EIDE and SCSI drive-interface standards?

Why is there confusion between EIDE and SCSI drive interface standards

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).

You install a SCSI adapter on your system to control both external and internal devices how will you achieve this?

Most SCSI cards have both internal and external connectors. I don't believe that software will know the difference between a device hooked up externally and one hooked up internally.

What is the Difference between SCSI and RAID cards?

RAID and SCSI are completely different things.RAID = Redundant Array of Independent Disks.SCSI = Small Computer System Interface.SCSI is the type of interface that exists on the physical hard drive for connecting it to a host device. The host, be it a computer or a RAID would need to also support the SCSI interface.RAID is a cluster of hard drives which work together as a storage system. RAID could use any type of interface, including SCSI.

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.