What is the difference between sas sata

The difference between sas sata is: 1. Different compatibility, mainly reflected in the compatibility of the physical layer and protocol layer; 2. Different speeds, the original SAS standard provides a data transmission speed of 300MB/s or 3Gb/second , while the SATA standard speed can only reach up to 150MB/s; 3. Different fees, etc.

#The operating environment of this article: Dell G3 computer, Windows 7 system.

The difference between SAS hard drive and SATA hard drive

1. Different compatibility

Specifically, the compatibility of the two Mainly reflected in the compatibility of the physical layer and protocol layer.

1. At the physical layer, the SAS interface and the SATA interface are fully compatible. SATA hard drives can be directly used in the SAS environment. In terms of interface standards, SATA is a sub-standard of SAS, so the SAS controller SATA hard drives can be directly controlled, but SAS cannot be used directly in a SATA environment because the SATA controller cannot control SAS hard drives;

2. At the protocol layer, SAS consists of 3 types of protocols. Use corresponding protocols for data transmission according to different connected devices. The Serial SCSI Protocol (SSP) is used to transmit SCSI commands; the SCSI Management Protocol (SMP) is used to maintain and manage connected devices; and the SATA Channel Protocol (STP) is used to transmit data between SAS and SATA. Therefore, with the cooperation of these three protocols, SAS can be seamlessly integrated with SATA and some SCSI devices.

2. Different speeds

The original SAS standard provides a data transmission speed of 300MB/s or 3Gb/second, while the speed of the SATA standard can only reach a maximum of 150MB /s.

3. Different costs

The price of SATA and SAS disks is very different. SATA disks are cheap, while SAS disks are not.

Extended information

There are many other differences between SATA and SAS. For example, for enterprises, all these differences make SCSI a better technology and a better choice than ATA.

SCSI commands are very powerful and have been used in important applications for decades. SCSI includes features such as command sequencing, which improves performance by allowing the controller to execute commands in the most efficient order. In a SCSI system, a dedicated controller handles the data flow between the disk system and the computer. In most SATA systems, the CPU completes this work, which means that this processing may be used to manage storage, such as running a database.

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