1. A machine implemented method, comprising: monitoring a non-volatile memory delay center for a first storage cluster having a first node and a second node configured to operate as a first high availability pair, where data for a write request to write data to the first node is also written to the second node as well as to a second cluster having a third node and a fourth node, where the third node and the fourth node are also configured to operate as a second high availability pair to store the data for the write request at one or both of the third and fourth node; wherein the non-volatile memory delay center is used to monitor and detect latency due to any delay caused by a non-volatile memory of the first node used as a write cache; determining if a sum of write traffic for storage volumes associated with the first node and write traffic from either the third node or the fourth node has reached a threshold value, when the latency in processing write requests is unacceptable; and notifying a user to check the non-volatile memory when the threshold value is reached.