Method for Higher Availability of the SSD Storage System

In the recent era of the high speed network, the enterprise storage systems expect storage devices to provide very high IOPS at minimal cost and faster access (low latency). The advents of the NAND flash solid state devices (SSD) have seen an unprecedented growth which mitigates the shortcoming of the disks to address the performance aspect of the storage system. Enterprise ready SSDs have started to fulfill that promise as they segment into SATA and PCIe based storage products. One of the major challenges among many of managing SSD drives in enterprise storage systems is the endurance (total number of years to fail). SSD devices have limited write / erase endurance cycles depending on the type of SSD device being used (SLC, TLC, and MLC etc.). The life or availability of the storage systems using SSD drives is in turn dependent on the durability and reliability of SSD drives. The proposed solution is a method to increase the availability of SSD based storage systems using the pool of SSDs optimally. In other words, the proposed solution is to optimize the life cycle of the SSD storage array considering the different endurance and occupancy value of the SSD drives.