Now the server hard disk interface technology used in the main, two, SATA and SCSI, SAS drives use the product is also available now, of course, high-end optical drives, including the first two are the most common. Here we SATA, SCSI, SAS interface technology such as a brief introduction. Now the server hard disk interface technology used in the main, two, SATA and SCSI, SAS drives use the product is also available now, of course, high-end optical drives, including the first two are the most common. Here we SATA, SCSI, SAS interface technology such as a brief introduction.
SATA SATA (SerialAdvancedTechnologyAttachment) is the acronym for Serial ATA, now can see a SATA-1 and SATA-2 are two standards, the corresponding speeds are 150MB / s and 300MB / s. SATA has replaced the main bottleneck for the PATA interface technology. From the speed of this connection, SATA SATA mode of the transmission advanced than PATA, PATA hard drive to far flung behind. Second, the data transmission from the point of view, SATA stronger anti-interference ratio of PATA.
SATA-1 and has been widely used, its maximum data transfer rate of 150MBps, the signal line up to 1 meter. Commonly used point to point SATA connection, that a connection on the motherboard SATA interface, the other end directly connected hard drive, no other devices can share the data lines, and parallel ATA to allow this situation (per data line can be connected to a -2 a device) and, therefore, do not like parallel ATA hard drive set as Master and Slave.
In addition, SATA hot-swap function of available PATA can not be compared, using this feature can be more easily set up the disk array. As the serial data line structure using only four pins, so compared with starting up the parallel port to install a more convenient and more conducive to reducing the cable box, a favorable heat.
SCSI SCSI (SmallComputerSystemInterface) is a specialized computer system designed for small memory cell interface mode, the computer can be a dynamic division multiple devices operate at the same time requirements for the system over the proper allocation of tasks can be flexible, Dynamic completed.
SCSI specification development today, is already the sixth-generation technology, from the time just to create the SCSI (8bit), WideSCSI (8bit), UltraWideSCSI (8bit/16bit), UltraWideSCSI2 (16bit), Ultra160SCSI (16bit) to today The Ultra320SCSI, speed from 1.2MB / s to the current 320MB / s with a qualitative leap. Current mainstream SCSI drives have adopted Ultra320SCSI interface, can provide 320MB / s interface transfer rate.
SCSI drives also have a special hot-swap technology, SCA2 Interface (80-pin), used in conjunction with the SCSI backplane, you can easily hot-swappable hard drives. Current working groups and departmental servers, hot swap function is almost essential.
SAS SAS is the abbreviation SerialAttachedSCSI that Serial Attached SCSI. November 26, 2001, Compaq, IBM, LSI Logic, Maxtor and Seagate announced the establishment of the Joint Working Group SAS, the objective is to define a new serial point-to enterprise-class storage device interface.
SAS SAS technology into the expander, so SAS the system can connect more devices, each extension allows to connect multiple ports, each port can be connected SAS device, host or other SAS expander. To protect user investment, SAS is also compatible with standard SATA, which makes SAS, SAS and SATA backplane compatible with two types of hard drives, the user, when using different types of hard drives do not need to re-invest.
Currently, SAS Interface rate of 3Gbps, SAS expander of its more than 12 ports. Soon, there will be 6Gbps even 12Gbps high-speed interface appears, and there will be 28 or 36-port SAS expander appears to suit different application requirements.
Summary: As SCSI has a CPU occupancy rate, multi-task concurrent operation, high efficiency, multi-connected devices, the advantages of long distance connections, the majority of server applications, recommended SCSI hard drive, and using the latest Ultra320SCSI controller; SATA drives also have hot plug capability and can interface with very good scalability, such as rack-mounted servers using SCSI-SATA, FC-SATA Interface, and the SATA port bit by device (PortMultiplier), it has more than SCSI better flexibility. For the low-end small server applications, you can use the latest SATA hard drive and controller.
Set the hard disk interface and type, we must focus on the above-mentioned study the impact of hard disk performance specifications, according to speed, single-disc capacity, the average seek time, cache and other factors, combined with capital budgets, the selected most appropriate program of cost-effective hard drives.
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