Types of performance counter charts

There are standard performance charts that display the counter values for the selected storage object. Each of the Advanced counter charts display the total values separated out into read, write, and other categories. Furthermore, some Advanced counter charts display additional detail when the chart is displayed in Zoom view.

The following table shows the available performance counter charts.

Available charts Chart description
Events Displays warning, critical, and information performance events in correlation with the statistical charts for the root object. All event types display:
  • System-defined
  • User-defined
  • Dynamic
Latency Number of milliseconds required to respond to application requests.

Note that the average latency values are I/O weighted.

Latency (Advanced) The same information shown in the Latency chart, but with the performance data separated into read and write latency.

When displayed in Zoom view for volumes, a second chart is displayed that shows latency by cluster component. This enables you to identify the cluster component that is responsible for the latency.

This chart option applies only when the selected object is an SVM, node, aggregate, volume, or LUN.

IOPS Number of input/output operations processed per second.
IOPS (Advanced) The same information shown in the IOPS chart, but with the performance data separated into read, write, and other IOPS.

When displayed in Zoom view:

  • For volumes, the chart displays QoS minimum and maximum throughput values, if configured in ONTAP.
  • For SVMs, the performance data is separated into individual charts for CIFS, NFS, FCP, and iSCSI protocol traffic.

This chart option applies only when the selected object is an SVM, node, aggregate, volume, or LUN.

IOPS/TB Number of input/output operations processed per second based on the total space that is being consumed by the workload, in terabytes. Also called I/O density, this counter measures how much performance can be delivered by a given amount of storage capacity.

This chart option applies only when the selected object is a volume.

MBps Number of megabytes of data transferred to and from the object per second.
MBps (Advanced) The same information shown in the MBps chart, but with the MBps data separated into disk reads, Flash Cache reads, and writes.

When displayed in Zoom view, the volumes chart displays QoS maximum throughput values, if configured in ONTAP.

This chart option applies only when the selected object is an SVM, node, aggregate, volume, or LUN.

Note: Flash Cache data is displayed only for nodes, and only when a Flash Cache module is installed in the node.
Performance Capacity Used Percentage of performance capacity that is being consumed by the node or aggregate.
Note: Performance capacity data is available only when the nodes in a cluster are installed with ONTAP 9.0 or later software.
Performance Capacity Used (Advanced) The same information shown in the Performance Capacity Used chart, but with the performance capacity used separated into user protocols and system background processes. Additionally, the amount of free performance capacity is shown.

This chart option applies only when the selected object is a node or aggregate.

Available IOPS Number of input/output operations per second that are currently available (free) on this object. This number is the result of subtracting the currently used IOPS from the total IOPS that Unified Manager calculates that the object can perform.

This chart option applies only when the selected object is a node or aggregate.

Note: Available IOPS data is available only when the nodes in a cluster are installed with ONTAP 9.0 or later software.
Utilization Available resource percentage of the object that is being used. Utilization indicates node utilization for nodes, disk utilization for aggregates, and bandwidth utilization for ports.

This chart option applies only when the selected object is a node, aggregate, or port.

Cache Miss Ratio Percentage of read requests from client applications that are returned from the disk instead of being returned from the cache.

This chart option applies only when the selected object is a volume.