This integer holds the high-order 32 bits of a 64-bit counter of read requests not immediately serviced because the requested data was still in the process of loading into cache, paired with the low-order cpqDaLogDrvCacheVolAccelNoOfReadMissLoading value, and returns -1 if not applicable. An admin only consults this on very high-throughput cache volumes where the low-order counter would have already wrapped. For example, this remaining at zero on a typical deployment indicates the loading-miss counter simply hasn't reached billions of events yet.