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MASCOTS
2008

Modelling and Validation of Response Times in Zoned RAID

11 years 9 months ago
Modelling and Validation of Response Times in Zoned RAID
We present and validate an enhanced analytical queueing network model of zoned RAID. The model focuses on RAID levels 01 and 5, and yields the distribution of I/O request response time. Whereas our previous work could only support arrival streams of I/O requests of the same type, the model presented here supports heterogeneous streams with a mixture of read and write requests. This improved realism is made possible through multiclass extensions to our existing model. When combined with priority queueing, this development also enables more accurate modelling of the way subtasks of RAID 5 write requests are scheduled. In all cases we derive analytical results for calculating not only the mean but also higher moments and the full distribution of I/O request response time. We validate our model against measurements from a real RAID system.
Abigail S. Lebrecht, Nicholas J. Dingle, William J
Added 29 Oct 2010
Updated 29 Oct 2010
Type Conference
Year 2008
Where MASCOTS
Authors Abigail S. Lebrecht, Nicholas J. Dingle, William J. Knottenbelt
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