A microdriver architecture for error correcting codes inside the Linux kernel

摘要

Coding tasks, such as encryption of data or the generation of failure-tolerant codes, belong to the most computationaly expensive tasks inside the Linux kernel. Their integration into the kernel enables the user to transparently access these functionalities, encrypted hard disks can be used in the same way as unencrypted ones. Nevertheless, Linux as a monolithic kernel is not prepared to support these expensive tasks by accessing modern hardware accelerators, like graphics processing units (GPUs), as the corresponding accelerator libraries, like the CUDA-API for NVIDIA GPUs, only offer user-space APIs. Linux is often used in conjunction with parallel file systems in high performance cluster environments and the tremendous storage growth in these environments leads to the requirement of multi-error correcting codes. Parallel file systems, which often run on a storage cluster, are required to store the calculated results without huge waiting times. Whereas the frontend of such a storage cluster can be build with standard PCs, it is in contrast nearly impossible to build a capable RAID backend with end user hardware up to now.