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The ADvanced Systems Laboratory (ADSL)
Overview
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We have investigated performance isolation in storage
systems: can the system ensure that the performance of one application
is not affected by the I/O patterns of others? We introduce
three pioneering approaches to ensure such isolation, both within a
single machine and in a distributed storage setting.
- Physical Disentanglement in a Container-Based File System
(OSDI '14). We change the on-disk
structure of a file system to support isolation, through a new
``cube'' abstraction. By placing all relevant data and metadata into
separate cubes, applications (and guest operating systems) can
ensure performance isolation properties between competing clients.
- Split-Level I/O Scheduling (SOSP '15)
We study the Linux I/O stack and show
intrinsic problems in achieving isolation and other fairness
properties; specificaly, we show the Linux ``fair share'' I/O
scheduler to be fundamentally flawed. We introduce a solution, the
Split I/O scheduler, that provides suitable integration between the file
system and block-level I/O scheduler to realize various scheduling policies.
- Principled Schedulability Analysis for Distributed Storage Systems
using Thread Architecture Models (OSDI '18). We
examine the difficulty of implementing isolation in scalable distributed
storage systems, and show how the thread architectures of current systems
inhibit the realization of desired properties. By restructuring the approach
to concurrency within each, we show how isolation and other
scheduling approaches can be implemented.
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