What is SCSI hardware?

What is SCSI hardware?

SCSI (Small Computer Systems Interface) is a smart bus, controlled with a microprocessor, that allows you to add up to 15 peripheral devices to the computer. These devices can include hard drives, scanners, printers, and other peripherals.

What are the two types of expanders used in SAS topologies select two?

There are two types of SAS expanders: fanout expanders and edge expanders.

Is SCSI still used?

The SCSI standard is no longer common in consumer hardware devices, but you’ll still find it used in some business and enterprise server environments. More recent versions include USB Attached SCSI (UAS) and Serial Attached SCSI (SAS). Adaptec SCSI Host Adapter.

What devices use SCSI?

The SCSI device functions on its own and only uses the SCSI interface to communicate with the rest of the computer. Some examples of SCSI devices are hard drives, CD-ROM drives, tape drives, and scanners.

Which hardware device is attached to our personal computer through SCSI port?

The initial Parallel SCSI was most commonly used for hard disk drives and tape drives, but it can connect a wide range of other devices, including scanners and CD drives, although not all controllers can handle all devices.

What is SAS wide port?

SAS is an evolution of the parallel SCSI device interface into a serial point-to-point interface. Phys are contained in SAS ports which contain one or more phys. A port is a wide port if there are more than one phy in the port. If there is only one phy in the port, it is a narrow port.

What is the use of SCSI port?

A SCSI connector (/ˈskʌzi/ SKUZ-ee) is used to connect computer parts that use a system called SCSI to communicate with each other. Generally, two connectors, designated male and female, plug together to form a connection which allows two components, such as a computer and a disk drive, to communicate with each other.

What are external SCSI devices?

External SCSI devices connect using thick, round cables. A SCSI controller coordinates between all of the other devices on the SCSI bus and the computer. Also called a host adapter, the controller can be a card that you plug into an available slot or it can be built into the motherboard.

What is the difference between a SCSI port identifier and device name?

In Fibre Channel, the port identifier is a WWPN and the device name is a WWNN. In SAS, both SCSI port identifiers and SCSI device names take the form of a SAS address, which is a 64 bit value, normally in the NAA IEEE Registered format. People sometimes refer to a SCSI port identifier as the SAS address of a device, out of confusion.

What is the purpose of SCSI?

The SCSI protocol provided a method for these devices to connect to, send commands, and send data to each other, i.e. a computer on ID7 could send a command (and some data) to a device on ID0. On another “level” – SCSI defines what (some of) these commands actualy are.

How are SCSI ports assigned to a SAS domain?

Each SAS port in a SAS domain has a SCSI port identifier that identifies the port uniquely within the SAS domain, the World Wide Name. It is assigned by the device manufacturer, like an Ethernet device’s MAC address, and is typically worldwide unique as well.

What is the difference between sasas-4 and SCSI Express?

SAS-4 is slated to introduce 22.5 Gbit/s signaling with a more efficient 128b/150b encoding scheme to realize a usable data rate of 2,400 MB/s while retaining compatibility with 6 and 12 Gbit/s. Additionally, SCSI Express takes advantage of the PCI Express infrastructure to directly connect SCSI devices over a more universal interface.