Patent ID: 7668980

Claim:
A method, comprising: receiving, at a primary storage control unit, an information unit from a remote host over a fibre channel connection, wherein persistent information unit pacing is implemented over the fibre channel connection; maintaining information on how many large writes have been received at the primary storage control unit over at least one logical path established over the fibre channel connection between the primary storage control unit and the remote host wherein a large write is an input/output (I/O) operation for which a number of information units that are processed exceeds a default value of an information unit pacing credit; and adjusting, by the primary storage control unit, an information unit pacing parameter included in a response sent from the primary storage control unit to the remote host, wherein the adjusting is based at least on the information maintained on how many of the large writes have been received at the primary storage control unit over the at least one logical path, wherein the information unit pacing parameter indicates the number of information units that the remote host is allowed to send to the primary storage control unit without waiting for any additional response from the primary storage control unit, the method further comprising: determining that there is no congestion of write buffers caused by the large writes; and selling the information unit pacing parameter for the at least one logical path to a number that is greater than sixteen but fewer than two hundred and fifty six.