Cache: ARC Target Size

This is arc_c from the ZFS ARC. This shows the target size that the ARC is attempting to maintain. For the actual size, see the Advanced Analytic Cache: ARC Size.

An understanding of ZFS ARC internals might be required to properly interpret this statistic.

When to Check ARC Target Size

Rarely; this might be useful for identifying internal behavior of the ARC; however, there are other statistics to check before this one.

If there are caching issues on Oracle ZFS Storage Appliance, 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 Analytics Cache: ARC Size and Cache: ARC Evicted Bytes for further details on the ARC behavior.

ARC Target Size Breakdowns