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There is a huge difference between hard disk drives (HDDs) and the solid state drives (SSDs) in terms of price and performance. A hybrid array is a type of storage management that aims to bridge the gap between these two types of storage by adding a flash level to the memory. This works towards betterment in I/O speed, and provides a more cost-effective solution as it provides cost per I/O. It has a combination of an HDD's large capacity and an SSD's fast performance.
HDDs have been considered the most convenient form of storage in recent decades, but the highest speed they can achieve is 15k RPM. To make up for the gap in performance, solid state drives have been developed with low capacities but fast performance. This gives rise to a problem where one has to choose between capacity and performance. Hybrid arrays are a solution to this. This type of storage combines the capacity of the HDD with the efficient performance of an SSD.
The key to hybrid arrays is dynamic data placement. This is based on the concept of the preset system, policies that are user defined and performance targets.
Advantages of hybrid arrays:
This form of storage allows access to data that is less frequently used. Hybrid arrays are perfect for applications such as tier management, caching, data management and similar functions.
It has been noticed that a flash drive of roughly 5% of the total disk space is instrumental in improving the overall performance of the disk. It provides efficient performance without having to upgrade the storage environment.