There are several ports of SAS 5,4 6Gbps SAS ports What does it mean?

Generally, there are two types of SATA and IDE

Among them, SATA is now in its 3rd generation.

IDE hard drive.

In general, a motherboard has only two IDE interfaces, and each interface can be attached to two IDE devices. However, two devices on the same interface share bandwidth, which has a great impact on speed. Therefore, people with a little common sense will connect the hard disk and optical drive to the motherboard with two separate IDE cables.

In this way, the IDE has a big problem, that is, although one motherboard can connect 4 devices, in fact, as long as there are more than two, the speed is greatly reduced.

The problem is that two devices on the same line must be set strictly according to the master and slave settings in order to operate normally. This Western Digital WD400 JB, the main hard disk has two different settings, when an IDE cable is only connected to this hard disk, press the right setting, and when you take the slave disk, you need to press the middle setting. According to personal experience, if you don't have a slave disk and set it up in the middle, there will be a variety of inexplicable problems - sometimes it can be booted, sometimes it is reported that the hard disk cannot be found, sometimes it is reported that the hard disk error is reported during the boot process, etc. - different problems may occur every time you boot up.

Hot-swappable is not supported.

Parallel ATA has limited capabilities to support hot-swapping of devices, which is important for server applications. Because the server usually adopts the RAID method, any hard disk can be hot-swapped and replaced if it is broken, without affecting the integrity of the data, ensuring that the server is normally turned on under any circumstances. SCSI and Fibre Channel with hot-swap support occupy almost all of the market for enterprise applications, and the main reason why parallel ATA has the advantage of not gaining a place is that it does not support hot-swappability.

SATA2 is SATA3G, SATA3 is SATA6G, and the maximum speed is different. SCSI and SAS are used on server hard disks, which are rarely available in civilian use. All three interfaces look exactly the same.

The label on the drive will indicate what standards are supported.

SATA is almost eliminated, SATA2 is the most popular, SATA3's latest SATA2 interface is black, SATA3 interface is blue.

Intel's 6 series motherboards generally only have SATA2 interfaces, and 7 series motherboards generally have SATA3 interfaces.

Distinguish the SATA interface of the motherboard: if the SATA2 interface is black, SATA3 is blue; If SATA2 is blue, SATA3 is white. The SATA port type is indicated on the motherboard PCB below the SATA connector.

sata3>sata2>sata

The interface is the same as looking at the identification identification.

The number of ports on board is 4 ports of 6Gbps, which should have 2 motherboards. So it's 2*4*6g.

iSCSI technology is a kind of research and development by IBM, is a hardware equipment can run on the upper layer of the IP protocol SCSI instruction set, this instruction set can be implemented to run the SCSI protocol on the IP network, so that it can be ISCSI on such as high-speed Gigabit Ethernet routing selection. iSCSI technology is a new storage technology that combines an existing SCSI interface with Ethernet technology to enable servers to exchange data with storage devices using IP networks. It is to access massive storage through the iSCSI channel over the Ethernet network.

SAS is the serialization of SCSI interface, which is basically a dedicated hard disk interface for servers, and of course, it can also be connected to storage devices such as optical drives with SAS interfaces.

Gbps, where G kilom, bps is bits per second, and the unit of measurement for data communication is the gigabit binary of data traffic per second.

SAS performance is fast and expensive, and it is recommended that enterprises that are generally not very large banks still use SATA, and SATA performance is slightly slower but it is about the same at present. The advantage is that it is relatively cheap, and the biggest advantage of using this interface is that it is universal, such as if the enterprise only has a SAS server host motherboard or array card is broken, it is impossible to quickly restore the server, first of all, this SAS interface is not available in ordinary computers. If you want to take out the files, it is impossible to quickly use an ordinary computer as a server.

You can only wait for the arrival of a new server, which is a waste of time. The SATA interface can be used to use ordinary computers to make some simple adjustments to quickly restore the OA system of the enterprise, because ordinary computers have this interface, and you can copy and adjust it directly by plugging it in.

SAS is better, and it can be used by computers and servers in general, but SATA is generally used by computers.

It should be 6Gbps, which is the data bandwidth.

That's four 6Gbps SAS interfaces.