DistOS 2015W Session 6
Midterm
The midterm from last year is now available.
Group 1
Team: Kirill, Jamie, Alexis, Veena, Khaled, Hassan
| FARSITE | OceanStore | |
|---|---|---|
| Fault Tolerance | Used Byzantine Fault Tolerance Algorithm - Did not manage well | Used Byzantine Fault Tolerance Algorithm - Did not manage well |
| Cryptography | Trusted Certificates | A strong cryptographic algorithm on read-only operations |
| Implementation | Did not mention what programming they used, but it was based on Windows. They did not implement the file system | Implemented in JAVA |
| Scalability | Scalable to a University or large corporations, maximum 105 | Worldwide scalability, maximum 1010 |
| File Usage | Was designed for general purpose files | Was designed for small file sizes |
| Scope | All clients sharing the available resources | Transient centralized service |
| Object Model | Didn't use the object model | Used the object model |
Group 2
Team Members: Apoorv, Ambalica, Ashley, Eric, Mert, Shivjot
==Group 3== DANY, MOE, DEEP, SAMEER, TROY
FARSITE
Security • Cascading certificates system through directory hierarchy • Keys • Three types of certificates • CFS required to authorized certificate
System Architecture • Client Monitor, directory group, file host • When space runs out in directory group, delegate’s ownership to sub tree to other delegate group.
OCEANSTORE
Security • GUID and ACLs used for write, encryption used for reads.