Adaptive batch sizing for asynchronous data redundancy

A method for redundantly backing up data in a data storage system having a first storage facility, a second storage facility and a communication medium between the first and second storage facilities, the meted comprising:

• performing a sequence of write transactions at a first storage facility;
• arranging the write transactions into a sequence of send batches at the first storage facility, said arranging comprising adaptively adjusting batch sizes based on a level of traffic on the communication medium wherein batch size is increased in response to detection of an increased level of communication traffic and decreased in response to detection of a decreased level of communication traffic;
• forwarding send batches to the second storage facility;
• and
• applying the write transactions in the send batches to a redundant data copy at the second storage facility.

A method for redundantly backing up data comprising:

• performing a sequence of write transactions at a first storage facility;
• arranging the write transactions into a sequence of send batches at the first storage facility wherein said arranging comprises adaptively adjusting batch sizes based on an expected dine between failures;
• forwarding send batches to the second storage facility;
• and
• applying the write transactions in the send batches to a redundant data copy at the second storage facility.