This integer holds the high-order 32 bits of a 64-bit counter of read cache hits for this cache volume, combined with the low-order cpqDaLogDrvCacheVolAccelNoOfReadHits value, and returns -1 if not determinable. An admin only needs this high-order half once the low-order counter has wrapped past its 32-bit limit on a very busy cache volume. For example, on a high-traffic database cache volume that has serviced billions of read hits, this high-order value finally becomes nonzero once the low-order counter has wrapped around.