Why is QStora a software-defined storage controller

Storage controller is a device that manages the physical disk drives and presents them to the computer as logical units. It is also called "storage processor" or "array controller".

Storage controller integrates the storage space in multiple storage devices and provides them as a single storage space to the client. When receiving a write data request from the client, the storage controller decides which of the multiple storage devices to allocate the data to, and stores the data in the selected one. When receiving a read request from the client, the storage controller finds the location where the data is stored, reads the data from the storage device and transmits it to the client. The storage controller performs these tasks in an efficient and stable manner. In addition to reading and writing data, the storage controller also implements various value-added functions, including dynamic allocation of volume capacity, snapshots, and so on.

QStora is a software-defined storage controller, which implements the functions of a hardware storage controller in a purely software manner.

What advantages does software-defined storage controller provide?

First, there is no need to purchase dedicated hardware controllers. This means that the QStora can be deployed from off-the-shelf resources, which can be a more cost-effective solution.

Second, QStora can expand storage space more easily. A RAID drive used to back up data can only be used with a certain number of drives. If you need more storage space, you may need a new RAID system, including a new server, disks, and RAID controller. In addition, the software is still required to tie the two separate RAID drives together. However, QStora can be used with more drives, 3 to thousands of QStora software-defined controllers can share a capacity-unlimited virtual storage pool.

Third, QStora is making continuous progress, supporting real-time upgrades, and will not interrupt business. However, if you find that the RAID controller contains errors or limitations, simply using a new RAID controller may not be an option. 

Fourth, QStora has no single bottleneck of throughput, while the limited bandwidth between hardware storage controllers and disk enclosure is the bottleneck of throughput.

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