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New PCI-e flash cards and SSDs supporting over 100,000 IOPs are nowavailable, with several usecases in the design of a high performance storagesystem. By using an array of flash chips, arranged in multiple banks, largecapacities are achieved. Such multi-banked architecture allow parallel read,write and erase operations. In a raw PCI-e flash card, such parallelism isdirectly available to the software layer. In addition, the devices haverestrictions such as, pages within a block can only be written sequentially.The devices also have larger minimum write sizes (greater than 4KB). Currentflash translation layers (FTLs) in Linux are not well suited for such devicesdue to the high device speeds, architectural restrictions as well as otherfactors such as high lock contention. We present a FTL for Linux that takesinto account the hardware restrictions, that also exploits the parallelism toachieve high speeds. We also consider leveraging the parallelism for garbagecollection by scheduling the garbage collection activities on idle banks. Wepropose and evaluate an adaptive method to vary the amount of garbagecollection according to the current I/O load on the device.

LFTL: A multi-threaded FTL for a Parallel IO Flash Card under Linux