Backend Configuration

Parameter Description Default
version Always 1  
storageDriverName “ontap-nas”, “ontap-nas-economy”, “ontap-nas-flexgroup”, “ontap-san”, “ontap-san-economy”  
backendName Custom name for the storage backend Driver name + “_” + dataLIF
managementLIF IP address of a cluster or SVM management LIF “”, “[2001:1234:abcd::fefe]”
dataLIF IP address of protocol LIF. Use square brackets for IPv6. Once set this cannot be updated Derived by the SVM unless specified
useCHAP Use CHAP to authenticate iSCSI for ONTAP SAN drivers [Boolean] false
chapInitiatorSecret CHAP initiator secret. Required if useCHAP=true “”
chapTargetInitiatorSecret CHAP target initiator secret. Required if useCHAP=true “”
chapUsername Inbound username. Required if useCHAP=true “”
chapTargetUsername Target username. Required if useCHAP=true “”
svm Storage virtual machine to use Derived if an SVM managementLIF is specified
igroupName Name of the igroup for SAN volumes to use “trident”username Username to connect to the cluster/SVM
password Password to connect to the cluster/SVM  
storagePrefix Prefix used when provisioning new volumes in the SVM. Once set this cannot be updated “trident”
limitAggregateUsage Fail provisioning if usage is above this percentage “” (not enforced by default)
limitVolumeSize Fail provisioning if requested volume size is above this value for the economy driver “” (not enforced by default)
debugTraceFlags Debug flags to use when troubleshooting. E.g.: {“api”:false, “method”:true} null


Do not use debugTraceFlags unless you are troubleshooting and require a detailed log dump.

For the ontap-san* drivers, the default is to use all data LIF IPs from the SVM and to use iSCSI multipath. Specifying an IP address for the dataLIF for the ontap-san* drivers forces them to disable multipath and use only the specified address.


When creating a backend, remember that the dataLIF and storagePrefix cannot be modified after creation. To update these parameters you will need to create a new backend.

A fully-qualified domain name (FQDN) can be specified for the managementLIF option.

The managementLIF for all ONTAP drivers can also be set to IPv6 addresses. Make sure to install Trident with the --use-ipv6 flag. Care must be taken to define the managementLIF IPv6 address within square brackets.


When using IPv6 addresses, make sure the managementLIF and dataLIF [if included in your backend defition] are defined within square brackets, such as [28e8:d9fb:a825:b7bf:69a8:d02f:9e7b:3555]. If the dataLIF is not provided, Trident will fetch the IPv6 data LIFs from the SVM.

To enable the ontap-san* drivers to use CHAP, set the useCHAP parameter to true in your backend definition. Trident will then configure and use bidirectional CHAP as the default authentication for the SVM given in the backend. The CHAP with ONTAP SAN drivers section explains how this works.

For the ontap-san-economy driver, the limitVolumeSize option will also restrict the maximum size of the volumes it manages for qtrees and LUNs.

You can control how each volume is provisioned by default using these options in a special section of the configuration. For an example, see the configuration examples below.

Parameter Description Default
spaceAllocation Space-allocation for LUNs “true”
spaceReserve Space reservation mode; “none” (thin) or “volume” (thick) “none”
snapshotPolicy Snapshot policy to use “none”
snapshotReserve Percentage of volume reserved for snapshots “0” if snapshotPolicy is “none”, else “”
splitOnClone Split a clone from its parent upon creation “false”
encryption Enable NetApp volume encryption “false”
securityStyle Security style for new volumes “unix”
tieringPolicy Tiering policy to use “none”; “snapshot-only” for pre-ONTAP 9.5 SVM-DR configuration

Here’s an example with defaults defined:

 "version": 1,
 "storageDriverName": "ontap-san",
 "managementLIF": "",
 "dataLIF": "",
 "svm": "trident_svm",
 "username": "admin",
 "password": "password",
 "storagePrefix": "alternate-trident",
 "igroupName": "custom",
 "debugTraceFlags": {"api":false, "method":true},
 "defaults": {
     "spaceReserve": "volume",
     "spaceAllocation": "false",
     "snapshotPolicy": "default",
     "snapshotReserve": "10"