A performance adjusting method and apparatus for a file system architecture. The method includes: determining a plurality of internet bandwidths among a client, an Object Storage Server (OSS), and a storage controller in a file system architecture; determining an overall network architecture of the file system architecture and a maximum transmission bandwidth of the file system architecture; testing read-write performance of a single Object Storage Target (OST) to calculate an Input/Output (IO) processing capability of a storage node; determining whether the maximum transmission bandwidth matches the IO processing capability of the storage node to add or reduce a storage array accordingly to adjust a number of OSTs; executing a performance benchmark test to determine IO read-write performance of the file system architecture; and determining whether the maximum transmission bandwidth matches the IO read-write performance to adjust a number of OSSs or a number of storage arrays accordingly.