Table of Contents

Analytical Modeling of Block Layer Extensions
Goals
Participants
- Meetings
Types of models

Analytical Modeling of Block Layer Extensions

Goals

Extensively study BORG and how it behaves with
- Different placement algorithms
- Online versus offline reconfigurations
Evaluate BORG performance on large-scale commodity system.

Participants

Meetings

06/09/09: Dissertation remaining items
03/30/09: Caching model and paper next steps
03/20/09: Wierd seek curve + probability of merging discussion
03/11/09: Model discussion - next steps
03/05/09: Discussion on parameter definition problem and modeling disk cache/buffer
02/16/09: More model discussion
02/02/09: More model discussion
01/22/09: Refining terminology and the model (device and workload)
01/20/09: ICAC paper planning and borg model
01/06/09: New equations discussion
12/29/08: Vanilla disk and workload model, some BORG workload model as well
12/23/08: Simple model discussion
12/16/08: Markov chain discussion
12/11/08: Fringe concerns to the model
12/05/08: Model discussion — on paper
12/02/08: Model discussion using queueing theory, probabilistic markov chains, workload parameters, etc.
11/24/08: Brief model review
11/20/08: Initial thoughts on the model - 3-part model, parameters, etc.

Types of models

Workload Model
- R/W Ratio
- % Sequentiality
- Disk Access Patterns
- Partial Determinism
Storage System Model
- Single disk R/W access times
- R/W accesses in disk arrays: Including overheads due to parallel I/Os, RMW/mirroring, etc
BORG Model
- Amount of data transferred: Depends on the size of the OPT and workload
- BOPT hits