This integer holds the high-order 32 bits of a 64-bit counter of read cache misses that triggered a data load from primary storage into the drive cache, paired with the low-order cpqDaLogDrvCacheVolAccelNoOfReadMissDoLoad value, and returns -1 if not applicable. An admin checks this high-order half only on extremely busy cache volumes where the low-order counter has already wrapped. For example, this value staying at zero on most systems simply confirms the load-miss counter hasn't yet reached the multi-billion range needing the high-order word.