Compared with traditional HDDs, SSDs have the advantage of smaller size, higher speed, high 4K read/write I/O performance, and lower power consumption. Combining HDD and SSD to form a hybrid storage pool, using HDD to store data and SSD for cache acceleration, can greatly improve storage performance. Generally, the number of random reads or writes per second of a storage pool accelerated by an SSD cache can be increased 10 fold and the average delay can be reduced by over 50%.
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