What is the impact of garbage collection on performance?

The startup policy of garbage collection is related to the remaining blank block space watermark (percentage). When the remaining blank block space is less than a certain percentage of the total hard disk space, the garbage collection starts, and different recycling policies and strength are used at different water levels. After the reclamation is started, a large amount of computing resources are occupied. In addition, the number of disks is increased due to the transfer of valid data. The lower the garbage amount is, the larger the amount of valid data is, the more disks are available, and the greater the impact on performance.