We introduce optimistic crash consistency, a new approach to crash consistency in
journaling file systems. Using an array of novel techniques, we demonstrate how to build an …

We present the first comprehensive study of applicationlevel crash-consistency protocols
built atop modern file systems. We find that applications use complex update protocols to …

Modern file systems use ordering points to maintain consistency in the face of system
crashes. However, such ordering leads to lower performance, higher complexity, and a …

Parallax is a distributed storage system that uses virtualization to provide storage facilities
specifically for virtual environments. The system employs a novel architecture in which …

This work is dedicated to eliminating the overhead required for guaranteeing the storage
order in the modern IO stack. The existing block device adopts a prohibitively expensive …

Applications depend on persistent storage to recover state after system crashes. But the
POSIX file system interfaces do not define the possible outcomes of a crash. As a result, it is …

We introduce split-level I/O scheduling, a new framework that splits I/O scheduling logic
across handlers at three layers of the storage stack: block, system call, and page cache. We …

It is challenging to simultaneously achieve multicore scalability and high disk throughput in a
file system. For example, even for commutative operations like creating different files in the …

Fast, byte-addressable NVM promises near cache latency and near memory bus throughput
for file system operations. However, unanticipated cache line eviction may lead to …

Ozone (O3) is a flash memory controller that increases the performance of a flash storage
system by executing multiple flash operations out of order. In the O3 flash controller, data …