Bandwidth guarantee framework and cost optimization method of multiple tenants under cloud platform

The invention relates to a bandwidth guarantee framework and cost optimization method of multiple tenants under a cloud platform. The method comprises the following steps: deciding a user combinationscheme by a tenant scheduler in a preset cache framework structure according to a historical access feature of a user; separately managing a user cache for both read and write operations to achieve anoptimal cache space allocation, and controlling an actual bandwidth acquired by the user based on an equivalent relationship between a bandwidth acquired by the user from underlying storage and a bandwidth of an updated cache, and strictly limiting a bandwidth upper limit acquired by the user below a target value; and dividing the cost of a storage system into the cost of distributed storage andthe cost of SSD (Solid State Disk) caching. By adjusting the size of the user cache, the sum of the caching cost of the user and the cost of a storage layer is the lowest, so that the system cost is minimized. The size of a use