Use the following procedure to determine if you need more read cache devices for the appliance.
Before You Begin
Go to maintenance hardware show to identify which chassis and slots contain read cache devices.
hostname:analytics worksheets> select worksheet-000 hostname:analytics worksheet-000> dataset
hostname:analytics worksheet-000 dataset (uncommitted)> set name="io.utilization[disk=hostname/HDD 13]" name = io.utilization[disk=hostname/HDD 13] hostname:analytics worksheet-000 dataset (uncommitted)> commit
hostname:analytics worksheet-000> done hostname:analytics worksheets> done
hostname:> analytics datasets
hostname:analytics datasets> show Datasets: DATASET STATE INCORE ONDISK NAME dataset-000 active 1.27M 15.5M arc.accesses[hit/miss] dataset-001 active 517K 9.21M arc.accesses[hit/miss=metadata hits][L2ARC eligibility] ... dataset-021 active 290K 7.80M io.utilization[disk=hostname/HDD 13] hostname:analytics datasets>
In this example, dataset name io.utilization[disk=hostname/HDD 13] corresponds to dataset-021.
hostname:analytics datasets> select dataset-021
hostname:analytics dataset-021> read 600
You may want to add more read cache devices when existing devices are 90% utilized.