This statistic shows accesses to the Directory Name Lookup Cache (DNLC). The DNLC caches pathname to inode lookups.
An understanding of operating system internals might be required to properly interpret this statistic.
When to Check DNLC Accesses
This can be useful to check if a workload accesses millions of small files, for which the DNLC can help.
If there are generic caching issues on Oracle ZFS Storage Appliance, first check the Cache: ARC Accesses statistic to see how well the ARC is performing, and the Protocol statistics to understand the requested workload. Then, check the Advanced Analytic Cache: ARC Size for the size of the ARC.
DNLC Accesses Breakdowns
Table 6-6 A Breakdown of DNLC Accesses
Shows counts for hits/misses, allowing the effectiveness of the DNLC to be checked.