Focus:

• Cache Coherence
• Distributed Locking
• Distributed Crash Recovery

Network FS

Traditional

Clients ⇒ Network ⇒ File servers

• Complexity at FS
• Clients are simple

Advantage: FS are trusted, but clients may not

Frangipani

FS’s live on clients, and they all share a virtual disk(like a big SSD drive)

• Complexity at client

Use case

Researchers compiling, editing programs and docs

Potentially share files (user-to-user sharing)

Design Choices

1. Caching (write-back)
   1. Researchers work on their private files
2. Strong consistency