Can the hard drive array perform at the rotational speed?

Two hard disks can only be grouped raid0, that is, the fusion array After the formation of the array, the capacity is twice the capacity of the smallest of your two hard disks, for example, you have a 320g plus a 500g group, and the group is 640g, not 820g, raid0 array is theoretically 2 times that of a single disk read and write (hehe, it has nothing to do with the speed you said, it is the read and write speed, not how many revolutions) but in fact, due to the occupation of bandwidth and resources, it is far from 2 times the effect. To put it simply, it's just to increase the capacity of a hard disk The difference between storage speed and a single disk is not very obvious It is recommended that you don't do a array Occupy CPU resources 2 hard disks are directly attached to a master disk and a slave disk It's simple. Also, whether you're in array or not?

It's not that two hard drives are hung or arrayed.

Hehe, that's not what it means You have two 2G 800 memory, and it won't become 1600 memory, but the bandwidth will increase, so the speed will increase The same goes for hard disks Follow-up question: Does it mean that two 7200 hard disks or no one is faster than 10000 rpm? ：

Can two people run faster than one person when they run together??? The speed at 7200 rpm is constant!! Follow-up:

This means that no matter how much hard drive I add 7200 rpm, it will not be able to play more than 15000 rpm? :Yes!!!

These two terms, while related to each other, actually represent two different aspects of hard drive failure, with reliability referring to the probability that a hard drive will fail under a given condition. Availability refers to the amount of time a hard drive is likely to spend in a certain purpose. Using these two terms, we can see how the disk array has improved the reliability of our hard disk system to nearly 100 percent.

Disk arrays can improve the reliability of hard disk systems. Because the data in one drive can be regenerated from data from other drives (e.g. RAID 5), there is rarely a chance that the entire drive system will fail. As a result, the reliability of the hard disk subsystem is greatly improved.

Figure 9 shows the reliability comparison of the RAID hard disk subsystem and the individual hard disk subsystem

We must also consider the usability of the system. The availability of a single hard disk system is better than that of a disk array without data redundancy, and the availability of a redundant disk array is much better than that of a single hard disk. This is because redundant disk arrays allow individual hard drives to make errors and continue to work properly.

In addition, the system recovery time after a hard drive failure is significantly reduced compared to recovering data from tape. Finally, because in the event of a failure, the data on the hard drive is the data at the time of the failure, and the replacement hard drive will also contain the data at the time of the failure (for example, the backup data from the previous night). To achieve full fault tolerance, other components of the computer's hard disk subsystem must also be redundant, such as providing two power supplies or having a dual hard disk controller.

Without the redundancy of other components, even a very reliable hard disk subsystem cannot completely prevent the failure of a computer system.