cpqDaLogDrvPerfCacheHits reports the total number of read cache hits for a logical volume, expressed in cache hits per second. A high cache hit rate means most read requests for that volume are being served from the controller's fast cache memory rather than the slower physical disks. For example, an admin seeing this figure drop sharply on a previously well-cached volume would investigate whether the controller's cache was recently reduced or a new workload pattern is defeating the cache.