9818246854

O Google implementation of DFS (cf. The Google File System - whitepaper)

O Distributed FS

3 For distributed data intensive applications O Storage for Google data O Installation

■    hundreds of TBs of storage, thousands of disks, over a thousand cheep commodity machines

O The architecture is failure sensitive 0

■    fault tolerance

■    error detection

■    automatic recovery

■    constant monitoring is reguired

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R.Wrembel- Politechnika Poznańska, Instytut Informatyki

GFS

O Typical file size: multiple GB O Operations on files

■    mostly appending new data multiple large sequential writes

■    no updates of already appended data

■    mostly large sequential reads

■    smali random reads occur rarely

■    file size at least 100MB

■    millionsof files

R.Wrembel - Politechnika Poznańska, Instytut Informatyki