Why Aggregate Latency graph in UM, shows constantly higher latency for one aggregate?

Applies to

ActiveIQ Unified Manager 9.7P1 (UM) and Later

Answer

• UM calculates the average weighted latency of each disk that is part of the aggregate, based on a few counters, such as Reads, writes and CP reads.
• UM always presents the highest average weighted latency of all the disks, as the aggregate latency
• Even if only one disk has higher latency, the total aggregate latency graph is affected.

Additional Information

• Use the statit command in ONTAP CLI to locate which disk(s) is having higher latency
• How to address latency from disks in ONTAP
• Why does the volume latency not match the aggregate latency in Active IQ Unified Manager?