cpqDaCntlrPerfSampleInterval reports, in seconds, the length of the performance-sampling interval used for a controller and all its associated logical volumes. Knowing this interval lets an admin correctly interpret rate-based counters, like commands per second, that are only meaningful relative to a known sampling window. For example, if this interval is set to 60 seconds, an admin would know that cpqDaCntlrPerfCommandCount represents commands processed over that full minute rather than an instantaneous value.