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What about REST?

ZAPI will reach end of availablity in ONTAP 9.13.1 released Q2 2023. Don't worry, Harvest has you covered. Switch to Harvest's REST collectors and collect idential metrics. See REST Strategy for more details.

Zapi Collector

The Zapi collectors uses the ZAPI protocol to collect data from ONTAP systems. The collector submits data as received from the target system, and does not perform any calculations or post-processing. Since the attributes of most APIs have an irregular tree structure, sometimes a plugin will be required to collect all metrics from an API.

The ZapiPerf collector is an extension of this collector, therefore they share many parameters and configuration settings.

Target System

Target system can be any cDot or 7Mode ONTAP system. Any version is supported, however the default configuration files may not completely match with older systems.


No SDK or other requirements. It is recommended to create a read-only user for Harvest on the ONTAP system (see prepare monitored clusters for details)


The collector collects a dynamic set of metrics. Since most ZAPIs have a tree structure, the collector converts that structure into a flat metric representation. No post-processing or calculation is performed on the collected data itself.

As an example, the aggr-get-iter ZAPI provides the following partial attribute tree:

  - aggr-raid-attributes:
      - disk-count
  - aggr-snapshot-attributes:
      - files-total

The Zapi collector will convert this tree into two "flat" metrics: aggr_raid_disk_count and aggr_snapshot_files_total. (The algorithm to generate a name for the metrics will attempt to keep it as simple as possible, but sometimes it's useful to manually set a short display name. See counters for more details.


The parameters and configuration are similar to those of the ZapiPerf collector. Only the differences will be discussed below.

Collector configuration file

Parameters different from ZapiPerf:

parameter type description default
schedule required same as for ZapiPerf, but only two elements: instance and data (collector does not run a counter poll)
no_max_records bool, optional don't add max-records to the ZAPI request
collect_only_labels bool, optional don't look for numeric metrics, only submit labels (suppresses the ErrNoMetrics error)
only_cluster_instance bool, optional don't look for instance keys and assume only instance is the cluster itself

Object configuration file

The Zapi collector does not have the parameters instance_key and override parameters. The optional parameter metric_type allows you to override the default metric type (uint64). The value of this parameter should be one of the metric types supported by the matrix data-structure.

ZapiPerf Collector


ZapiPerf collects performance metrics from ONTAP systems using the ZAPI protocol. The collector is designed to be easily extendable to collect new objects or to collect additional counters from already configured objects.

This collector is an extension of the Zapi collector. The major difference between them is that ZapiPerf collects only the performance (perf) APIs. Additionally, ZapiPerf always calculates final values from the deltas of two subsequent polls.


The collector collects a dynamic set of metrics. The metric values are calculated from two consecutive polls (therefore, no metrics are emitted after the first poll). The calculation algorithm depends on the property and base-counter attributes of each metric, the following properties are supported:

property formula description
raw x = xi no post-processing, value x is submitted as it is
delta x = xi - xi-1 delta of two poll values, xi and xi-1
rate x = (xi - xi-1) / (ti - ti-1) delta divided by the interval of the two polls in seconds
average x = (xi - xi-1) / (yi - yi-1) delta divided by the delta of the base counter y
percent x = 100 * (xi - xi-1) / (yi - yi-1) average multiplied by 100


The parameters of the collector are distributed across three files:

  • Harvest configuration file (default: harvest.yml)
  • ZapiPerf configuration file (default: conf/zapiperf/default.yaml)
  • Each object has its own configuration file (located in conf/zapiperf/cdot/ and conf/zapiperf/7mode/ for cDot and 7Mode systems respectively)

Except for addr, datacenter and auth_style, all other parameters of the ZapiPerf collector can be defined in either of these three files. Parameters defined in the lower-level file, override parameters in the higher-level file. This allows the user to configure each objects individually, or use the same parameters for all objects.

The full set of parameters are described below.

Harvest configuration file

Parameters in poller section should define (at least) the address and authentication method of the target system:

parameter type description default
addr string, required address (IP or FQDN) of the ONTAP system
datacenter string, required name of the datacenter where the target system is located
auth_style string, optional authentication method: either basic_auth or certificate_auth basic_auth
ssl_cert, ssl_key string, optional full path of the SSL certificate and key pairs (when using certificate_auth)
username, password string, optional full path of the SSL certificate and key pairs (when using basic_auth)

ZapiPerf configuration file

This configuration file (the "template") contains a list of objects that should be collected and the filenames of their configuration (explained in the next section).

Additionally, this file contains the parameters that are applied as defaults to all objects. (As mentioned before, any of these parameters can be defined in the Harvest or object configuration files as well).

parameter type description default
use_insecure_tls bool, optional skip verifying TLS certificate of the target system false
client_timeout duration (Go-syntax) how long to wait for server responses 30s
batch_size int, optional max instances per API request 500
latency_io_reqd int, optional threshold of IOPs for calculating latency metrics (latencies based on very few IOPs are unreliable) 100
schedule list, required the poll frequencies of the collector/object, should include exactly these three elements in the exact same other:
- counter duration (Go-syntax) poll frequency of updating the counter metadata cache (example value: 20m)
- instance duration (Go-syntax) poll frequency of updating the instance cache (example value: 10m)
- data duration (Go-syntax) poll frequency of updating the data cache (example value: 1m)

Note Harvest allows defining poll intervals on sub-second level (e.g. 1ms), however keep in mind the following:
  • API response of an ONTAP system can take several seconds, so the collector is likely to enter failed state if the poll interval is less than client_timeout.
  • Small poll intervals will create significant workload on the ONTAP system, as many counters are aggregated on-demand.
  • Some metric values become less significant if they are calculated for very short intervals (e.g. latencies)

The template should define objects in the objects section. Example:

  SystemNode: system_node.yaml
  HostAdapter: hostadapter.yaml

Note that for each object we only define the filename of the object configuration file. The object configuration files are located in subdirectories matching to the ONTAP version that was used to create these files. It is possible to have multiple version-subdirectories for multiple ONTAP versions. At runtime, the collector will select the object configuration file that closest matches to the version of the target ONTAP system. (A mismatch is tolerated since ZapiPerf will fetch and validate counter metadata from the system.)

Object configuration file

The Object configuration file ("subtemplate") should contain the following parameters:

parameter type description default
name string display name of the collector that will collect this object
object string short name of the object
query string raw object name used to issue a ZAPI request
counters list list of counters to collect (see notes below)
instance_key string label to use as instance key (either name or uuid)
override list of key-value pairs override counter properties that we get from ONTAP (allows circumventing ZAPI bugs)
plugins list plugins and their parameters to run on the collected data
export_options list parameters to pass to exporters (see notes below)


This section defines the list of counters that will be collected. These counters can be labels, numeric metrics or histograms. The exact property of each counter is fetched from ONTAP and updated periodically.

Some counters require a "base-counter" for post-processing. If the base-counter is missing, ZapiPerf will still run, but the missing data won't be exported.

The display name of a counter can be changed with => (e.g., nfsv3_ops => ops). There's one conversion Harvest does for you by default, the instance_name counter will be renamed to the value of object.

Counters that are stored as labels will only be exported if they are included in the export_options section.


Parameters in this section tell the exporters how to handle the collected data. The set of parameters varies by exporter. For Prometheus and InfluxDB exporters, the following parameters can be defined:

  • instances_keys (list): display names of labels to export with each data-point
  • instance_labels (list): display names of labels to export as a separate data-point
  • include_all_labels (bool): export all labels with each data-point (overrides previous two parameters)