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SUMMARY:Providing Concurrency in Direct Access File Systems LOCATION:CoRE B 305 DESCRIPTION;ENCODING=QUOTED-PRINTABLE:
Abstract:
File systems are essential software use d for storing data in end-user devices, IoT devices, servers, as well as hi gh-performance computing systems. With the advent of ultra-fast storage tec hnologies like NVMe that are slowly replacing traditional hard disks, perfo rmance bottleneck of storage system has shifted from hardware to software. A holy grail in modern storage research is to provide direct storage access (i.e., bypassing the OS) but without compromising data integrity, crash-co nsistency, security, and concurrency. However, prior approaches have built direct-access file systems that satisfy the first three properties but fail to provide concurrency, where tens and hundreds of cores access the file s ystem simultaneously.
In this talk, I will first provide a detailed a nalysis of concurrency bottlenecks in state-of-the-art OS and user-level fi le systems. I will then present PARAFS, a direct-access user-level file sys tem that increases concurrency, efficiently schedules I/O requests, and pro vides light-weight crash consistency. ParaFS achieves these goals by moving the file system into the device firmware, introducing concurrency at the f irmware-level, and exploiting storage hardware's compute resources. ParaFS also implements an efficient multi-queue parallel I/O scheduler for efficie nt data dispatch and fairness. For crash-consistency, ParaFS exploits byte- addressability of modern non-volatile memory. Our evaluation of PARAFS show s more than 2x performance gains over state-of-the-art file systems.
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