The manager checks cache state and if the block is cache resident, the manager requests the caching machine to satisfy the request. Else, we must get the block from disk. The manager examines the index map to get the block address. Using this block address, the manager consults the stripe group map to figure out from whom to request the block. The request goes to the storage server and the storage server sends the data to the client that initially requested it.
Machines attain ownership before writes.
Managers track caching and ownership. Management Distribution Policies Compare First Writer to Central Server. File Creator becomes manager. Use 7-day NFS trace for 236 client machines. Metric is number of network hops.