The SCSI hard disk is a hard disk with SCSI interface.It is an abbreviation of Small Computer System Interface. It uses a 50-pin interface and has a similar appearance to a normal hard disk interface.
Straight-through SCSI disks provide a way to connect Hyper-V virtual machines to physical storage (as opposed to relying on virtual hard disks). However, it should be noted that the use of straight-through scsi disks has certain limitations.
Compared with ordinary IDE hard disks, SCSI hard disks have many advantages: Fat interface Speed, mainly used for servers, high cost-effective hard disk, Fast hard disk speed, large cache capacity, Lower CPU usage , better scalability than IDE hard drive, support hot swap.
1, Fast Speed
The SCSI hard disk used by the server is fast, which can reach 7200 or 10,000 rpm or even higher; it is also configured with a large (usually 2MB or 4MB) write-back cache; the average access time is short;External transmission rate and Internal The transmission rate is higher, and the standard SCSI hard disk such as Ultra Wide SCSI, Ultra2 Wide SCSI, Ultra160 SCSI, Ultra320 SCSI, etc., the data transfer rate can be reached to 40MB, 80MB, 160MB, 320MB per second.
2, High reliability
The hard disk uses S.M.A.R.T technology (self-monitoring, analysis and reporting technology), and the hard disk manufacturers have adopted their own unique advanced technology to ensure data security. In order to avoid accidental losses, server hard drives can generally withstand 300G to 1000G impact.
3, Mainly use of SCSI interface
Most servers use SCSI hard drives with high data throughput and extremely low CPU usage. SCSI hard disks must be used through the SCSI interface. Some server motherboards integrate SCSI interfaces. Some have dedicated SCSI interface cards. One SCSI interface card can connect seven SCSI devices, which is unmatched by the IDE interface.
4, Support hot swap
Hot Swap is a hard disk installation method supported by some servers. It can unplug or insert a hard disk without stopping the server. The operating system automatically recognizes the changes of the hard disk.
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