Limiting bandwidth usage on asynchronous replication sessions for a destination storage system
Abstract:
An aspect of implementing bandwidth limits on replication sessions for a destination includes creating a list of routing modules having ownership of links going to the destination, calculating, by control modules, a proportionate share of a requested total bandwidth limit based on a number of slices owned and the number of routing modules. The proportionate share of the bandwidth limit is indicated by a budget value of a budget byte window (BBW). An aspect further includes prior to initiating a scan of the slices, identifying a BBW having a budget value equal or greater than the value, allocating the budget value to a thread, and reducing the budget value of the BBW by the predetermined value. An aspect also includes scanning the slices corresponding to the identified BBW, sending a number of bytes transmitted and corresponding number of pages to respective control modules resulting from the scanning, and updating corresponding BBW.
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