PPT Slide

policy

view

trigger

adaptation code

policy compiler

Example: Adaptation Code

while ((average queue length for any disk D) > (120% of average for whole system)) migrate hottest object on D to disk with shortest average queue length

foreach disk_id from_disk { if (queue_length[from_disk] > 1.2*average_queue_length) user_migrate(from_disk,short_disk)}

DEFINE VIEW (average_queue_length=...,queue_length[]=...,

disk_id[]=...,

short_disk=...

)

mechanism libraries

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