[Colloquium] Reminder: Monday's talk by Timothy Denehy

[Margery Ishmael]

REMINDER: DEPARTMENT OF COMPUTER SCIENCE - TALK

Date: Monday, May 1, 2006
Time: 2:30 p.m.
Place: Ryerson 251

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Speaker:  TIMOTHY DENEHY

From:  University of Wisconsin - Madison

Url:  http://www.cs.wisc.edu/~tedenehy/

Title:  Information and Collaboration in the Storage Stack

Abstract:

For over two decades, the interface between file systems and storage  
systems
has consisted of a simple, linear array of blocks that can be read  
and written.
This abstraction has enabled innovations in each of the surrounding  
layers,
but it also obscures implementation details that may compromise the  
performance
and reliability of the system as a whole.  In this talk I will  
discuss two
pieces of work that address this limitation in the storage interface.

First, I will describe Shear, a software system that automatically  
discovers
the important RAID properties hidden by the block interface.  This  
information
can be used to improve performance by tuning the file system to  
particular RAID
characteristics.  Shear can also be used in a management context to  
verify RAID
construction and monitor the operation of an array.  Second, I will  
describe
journal-guided resynchronization, which uses file system knowledge  
and an
expanded interface to improve the process of software RAID crash  
recovery.
This collaborative approach reduces recovery time by several orders of
magnitude, improving reliability and availability while suffering little
performance loss during normal operation.

***The talk will be followed by refreshments in Ryerson 255***

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Host:  David B. MacQueen

People in need of assistance should call 773-834-8977 in advance.

For information on future CS talks: http://www.cs.uchicago.edu/events





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