| 摘要 |
A solid state device (SSD) write operation management system including a file system that incorporates SSD status information into its operational logic is disclosed. By incorporating SSD status information, the system achieves various advantages over conventional systems, such as enhanced write performance and extended SSD lifespan. The system processes various criteria to select the optimal virtual device (“vdev”) for data allocation in response to a write request. The first criterion utilizes Program/Erase counts of physical blocks contained in the SSDs. Another criterion is the number of physical free blocks of a drive. If the average of the selected vdev's physical free blocks is higher than the OP threshold, then the system selects for data allocation the vdev with the greatest amount of logical free space. In the instance that the average is lower, the system schedules garbage collection for the vdev. |
