1. Network-Embedded Programmable Storage and Its Applications
Randy Wang
Princeton University

2. Experiments: Network-Embedded Programmable Storage
“Active capsules” that manipulate embedded storage
Relationship with active nets:
“Stem cells” vs. “blood vessels”
Make embedded storage as accessible as network resources
Decouple intelligence from infrastructure

3. An Application: A Meta Distributed File SystemSs C Sb
Clients
STONEs (STOrage Network Elements)
More complex world than LAN vs. WAN
What is a “meta file system”?
A common framework, with
Customizable STONE components
For different topologies and different workloads
Possibly with a “STONE compiler”
Other applications: “P2P-rsync”, crawler, etc.

4. Party Lines
Tackling persistent storage is the next logical step for active nets
Network and storage resources complement each other
Network-embedded programmable storage:
Application-driven research
Rapid deployment of new applications
Sophisticated customization of a single application

5. SkunkNet: A Mobile Storage Network1 2 3 4 5 6 7
Skunk device
Wired host
Weakly wired host (DSL)
WAN connectivity server
Disconnected server
Strong wired link
Weak wired link
Ad hoc links
Weak WAN link (cellular)
(a)
(b)
“Ad hoc file system”
Routing layer: route from any device to any other device
Storage layer: track which device has what data
Composition of the two layers: route to the best replica

6. Requirements
Minimum
A non-root account, access to a raw disk partition
Minimum++
Vital stats, like pathchar
Root

7. ... Wish List (Two Interfaces) Per-node OS Global OS
STONE
SOS
Application
(Injected)
...
SOS Interface
PROGNOS
(Edge)
PROGNOS Interface
Per-node OS
Global OS
Resource container, code injection, persistent storage management, connectivity, location service, lock service

8. ... What we have done preliminary work on Per-node OS Global OS
STONE
SOS
Application
(Injected)
...
SOS Interface
PROGNOS
(Edge)
PROGNOS Interface
Per-node OS
Global OS
Resource container, code injection, persistent storage management, connectivity, location service, lock service

9. ... What we continue to improve on Per-node OS Global OS
STONE
SOS
Application
(Injected)
...
SOS Interface
PROGNOS
(Edge)
PROGNOS Interface
Per-node OS
Global OS
Resource container, code injection, persistent storage management, connectivity, location service, lock service

10. Stumbling blocks?
Mutual interference?