An intermittent error refers to an error that occurs irregularly because of something like a loose cable. In such a case, I/O performance might decrease while an automatic failback is being performed to repair an intermittent error. This is because the automatic failback operation is being performed repeatedly (because the intermittent error keeps occurring). To prevent this from happening, HDLM can automatically remove the path where an intermittent error is occurring from the paths that are subject to automatic failbacks. This process is called intermittent error monitoring.
We recommend that you use intermittent error monitoring along with the automatic failback function.
A path in which an error occurs a specified number of times within a specified interval is determined to have an intermittent error. The path where an intermittent error occurs has an error status until the user chooses to place the path back online. Failbacks are not performed for such paths. This status is referred to as the not subject to auto failback status.