Please match the following problems, challenges and corresponding solutions encountered in the digital transformation of government and enterprises.

In OpenStack, which of the following is not considered persistent storage?

In order to cope with the surge in business visits and waste of resources during e-commerce major sales and flash sales, you can set up an elastic scaling alarm policy to automatically Increase or decrease the number of elastic cloud servers.

Heat engine is the core service of Heat. Its functions include three layers. The first layer is to create a Stack and analyze the dependencies of various resources in the Stack; the second layer is to receive requests from the Heat level and input parameters according to the template; the third layer is to based on the parsed relationship, various service clients are called in sequence to create various resources.

In Huawei Cloud Stack, which of the following descriptions of resource sets are correct? (Multiple choice)