References - Helm Values - 《Longhorn v1.6.1 Documentation》

Values

Helm Values

Values

The values.yaml file contains items used to tweak a deployment of this chart.

Cattle Settings

Key	Type	Default	Description
global.cattle.systemDefaultRegistry	string	`“”`	Default system registry.
global.cattle.windowsCluster.defaultSetting.systemManagedComponentsNodeSelector	string	`“kubernetes.io/os:linux”`	Node selector for system-managed Longhorn components.
global.cattle.windowsCluster.defaultSetting.taintToleration	string	`“cattle.io/os=linux:NoSchedule”`	Toleration for system-managed Longhorn components.
global.cattle.windowsCluster.enabled	bool	`false`	Setting that allows Longhorn to run on a Rancher Windows cluster.
global.cattle.windowsCluster.nodeSelector	object	`{“kubernetes.io/os”:”linux”}`	Node selector for Linux nodes that can run user-deployed Longhorn components.
global.cattle.windowsCluster.tolerations	list	`[{“effect”:”NoSchedule”,”key”:”cattle.io/os”,”operator”:”Equal”,”value”:”linux”}]`	Toleration for Linux nodes that can run user-deployed Longhorn components.

Network Policies

Key	Type	Default	Description
networkPolicies.enabled	bool	`false`	Setting that allows you to enable network policies that control access to Longhorn pods.
networkPolicies.type	string	`“k3s”`	Distribution that determines the policy for allowing access for an ingress. (Options: “k3s”, “rke2”, “rke1”)

Image Settings

Key	Type	Default	Description
image.csi.attacher.repository	string	`“longhornio/csi-attacher”`	Repository for the CSI attacher image. When unspecified, Longhorn uses the default value.
image.csi.attacher.tag	string	`“v4.4.2”`	Tag for the CSI attacher image. When unspecified, Longhorn uses the default value.
image.csi.livenessProbe.repository	string	`“longhornio/livenessprobe”`	Repository for the CSI liveness probe image. When unspecified, Longhorn uses the default value.
image.csi.livenessProbe.tag	string	`“v2.11.0”`	Tag for the CSI liveness probe image. When unspecified, Longhorn uses the default value.
image.csi.nodeDriverRegistrar.repository	string	`“longhornio/csi-node-driver-registrar”`	Repository for the CSI Node Driver Registrar image. When unspecified, Longhorn uses the default value.
image.csi.nodeDriverRegistrar.tag	string	`“v2.9.2”`	Tag for the CSI Node Driver Registrar image. When unspecified, Longhorn uses the default value.
image.csi.provisioner.repository	string	`“longhornio/csi-provisioner”`	Repository for the CSI Provisioner image. When unspecified, Longhorn uses the default value.
image.csi.provisioner.tag	string	`“v3.6.2”`	Tag for the CSI Provisioner image. When unspecified, Longhorn uses the default value.
image.csi.resizer.repository	string	`“longhornio/csi-resizer”`	Repository for the CSI Resizer image. When unspecified, Longhorn uses the default value.
image.csi.resizer.tag	string	`“v1.9.2”`	Tag for the CSI Resizer image. When unspecified, Longhorn uses the default value.
image.csi.snapshotter.repository	string	`“longhornio/csi-snapshotter”`	Repository for the CSI Snapshotter image. When unspecified, Longhorn uses the default value.
image.csi.snapshotter.tag	string	`“v6.3.2”`	Tag for the CSI Snapshotter image. When unspecified, Longhorn uses the default value.
image.longhorn.backingImageManager.repository	string	`“longhornio/backing-image-manager”`	Repository for the Backing Image Manager image. When unspecified, Longhorn uses the default value.
image.longhorn.backingImageManager.tag	string	`“master-head”`	Tag for the Backing Image Manager image. When unspecified, Longhorn uses the default value.
image.longhorn.engine.repository	string	`“longhornio/longhorn-engine”`	Repository for the Longhorn Engine image.
image.longhorn.engine.tag	string	`“master-head”`	Tag for the Longhorn Engine image.
image.longhorn.instanceManager.repository	string	`“longhornio/longhorn-instance-manager”`	Repository for the Longhorn Instance Manager image.
image.longhorn.instanceManager.tag	string	`“master-head”`	Tag for the Longhorn Instance Manager image.
image.longhorn.manager.repository	string	`“longhornio/longhorn-manager”`	Repository for the Longhorn Manager image.
image.longhorn.manager.tag	string	`“master-head”`	Tag for the Longhorn Manager image.
image.longhorn.shareManager.repository	string	`“longhornio/longhorn-share-manager”`	Repository for the Longhorn Share Manager image.
image.longhorn.shareManager.tag	string	`“master-head”`	Tag for the Longhorn Share Manager image.
image.longhorn.supportBundleKit.repository	string	`“longhornio/support-bundle-kit”`	Repository for the Longhorn Support Bundle Manager image.
image.longhorn.supportBundleKit.tag	string	`“v0.0.33”`	Tag for the Longhorn Support Bundle Manager image.
image.longhorn.ui.repository	string	`“longhornio/longhorn-ui”`	Repository for the Longhorn UI image.
image.longhorn.ui.tag	string	`“master-head”`	Tag for the Longhorn UI image.
image.openshift.oauthProxy.repository	string	`“quay.io/openshift/origin-oauth-proxy”`	Repository for the OAuth Proxy image. This setting applies only to OpenShift users.
image.openshift.oauthProxy.tag	float	`4.14`	Tag for the OAuth Proxy image. This setting applies only to OpenShift users. Specify OCP/OKD version 4.1 or later. The latest stable version is 4.14.
image.pullPolicy	string	`“IfNotPresent”`	Image pull policy that applies to all user-deployed Longhorn components, such as Longhorn Manager, Longhorn driver, and Longhorn UI.

Service Settings

Key	Description
service.manager.nodePort	NodePort port number for Longhorn Manager. When unspecified, Longhorn selects a free port between 30000 and 32767.
service.manager.type	Service type for Longhorn Manager.
service.ui.nodePort	NodePort port number for Longhorn UI. When unspecified, Longhorn selects a free port between 30000 and 32767.
service.ui.type	Service type for Longhorn UI. (Options: “ClusterIP”, “NodePort”, “LoadBalancer”, “Rancher-Proxy”)

StorageClass Settings

Key	Type	Default	Description
persistence.backingImage.dataSourceParameters	string	`nil`	Data source parameters of a backing image used in a Longhorn StorageClass. You can specify a JSON string of a map. (Example: `‘{\”url\”:\”https://backing-image-example.s3-region.amazonaws.com/test-backing-image\"}‘`)
persistence.backingImage.dataSourceType	string	`nil`	Data source type of a backing image used in a Longhorn StorageClass. If the backing image exists in the cluster, Longhorn uses this setting to verify the image. If the backing image does not exist, Longhorn creates one using the specified data source type.
persistence.backingImage.enable	bool	`false`	Setting that allows you to use a backing image in a Longhorn StorageClass.
persistence.backingImage.expectedChecksum	string	`nil`	Expected SHA-512 checksum of a backing image used in a Longhorn StorageClass.
persistence.backingImage.name	string	`nil`	Backing image to be used for creating and restoring volumes in a Longhorn StorageClass. When no backing images are available, specify the data source type and parameters that Longhorn can use to create a backing image.
persistence.defaultClass	bool	`true`	Setting that allows you to specify the default Longhorn StorageClass.
persistence.defaultClassReplicaCount	int	`3`	Replica count of the default Longhorn StorageClass.
persistence.defaultDataLocality	string	`“disabled”`	Data locality of the default Longhorn StorageClass. (Options: “disabled”, “best-effort”)
persistence.defaultFsType	string	`“ext4”`	Filesystem type of the default Longhorn StorageClass.
persistence.defaultMkfsParams	string	`“”`	mkfs parameters of the default Longhorn StorageClass.
persistence.defaultNodeSelector.enable	bool	`false`	Setting that allows you to enable the node selector for the default Longhorn StorageClass.
persistence.defaultNodeSelector.selector	string	`“”`	Node selector for the default Longhorn StorageClass. Longhorn uses only nodes with the specified tags for storing volume data. (Examples: “storage,fast”)
persistence.migratable	bool	`false`	Setting that allows you to enable live migration of a Longhorn volume from one node to another.
persistence.nfsOptions	string	`“”`	Set NFS mount options for Longhorn StorageClass for RWX volumes
persistence.reclaimPolicy	string	`“Delete”`	Reclaim policy that provides instructions for handling of a volume after its claim is released. (Options: “Retain”, “Delete”)
persistence.recurringJobSelector.enable	bool	`false`	Setting that allows you to enable the recurring job selector for a Longhorn StorageClass.
persistence.recurringJobSelector.jobList	list	`[]`	Recurring job selector for a Longhorn StorageClass. Ensure that quotes are used correctly when specifying job parameters. (Example: `[{“name”:”backup”, “isGroup”:true}]`)
persistence.removeSnapshotsDuringFilesystemTrim	string	`“ignored”`	Setting that allows you to enable automatic snapshot removal during filesystem trim for a Longhorn StorageClass. (Options: “ignored”, “enabled”, “disabled”)

CSI Settings

Key	Description
csi.attacherReplicaCount	Replica count of the CSI Attacher. When unspecified, Longhorn uses the default value (“3”).
csi.kubeletRootDir	kubelet root directory. When unspecified, Longhorn uses the default value.
csi.provisionerReplicaCount	Replica count of the CSI Provisioner. When unspecified, Longhorn uses the default value (“3”).
csi.resizerReplicaCount	Replica count of the CSI Resizer. When unspecified, Longhorn uses the default value (“3”).
csi.snapshotterReplicaCount	Replica count of the CSI Snapshotter. When unspecified, Longhorn uses the default value (“3”).

Longhorn Manager Settings

Longhorn consists of user-deployed components (for example, Longhorn Manager, Longhorn Driver, and Longhorn UI) and system-managed components (for example, Instance Manager, Backing Image Manager, Share Manager, CSI Driver, and Engine Image). The following settings only apply to Longhorn Manager.

Key	Type	Default	Description
longhornManager.log.format	string	`“plain”`	Format of Longhorn Manager logs. (Options: “plain”, “json”)
longhornManager.nodeSelector	object	`{}`	Node selector for Longhorn Manager. Specify the nodes allowed to run Longhorn Manager.
longhornManager.priorityClass	string	`“longhorn-critical”`	PriorityClass for Longhorn Manager.
longhornManager.serviceAnnotations	object	`{}`	Annotation for the Longhorn Manager service.
longhornManager.tolerations	list	`[]`	Toleration for Longhorn Manager on nodes allowed to run Longhorn Manager.

Longhorn Driver Settings

Key	Type	Default	Description
longhornDriver.nodeSelector	object	`{}`	Node selector for Longhorn Driver. Specify the nodes allowed to run Longhorn Driver.
longhornDriver.priorityClass	string	`“longhorn-critical”`	PriorityClass for Longhorn Driver.
longhornDriver.tolerations	list	`[]`	Toleration for Longhorn Driver on nodes allowed to run Longhorn components.

Longhorn UI Settings

Key	Type	Default	Description
longhornUI.nodeSelector	object	`{}`	Node selector for Longhorn UI. Specify the nodes allowed to run Longhorn UI.
longhornUI.priorityClass	string	`“longhorn-critical”`	PriorityClass for Longhorn UI.
longhornUI.replicas	int	`2`	Replica count for Longhorn UI.
longhornUI.tolerations	list	`[]`	Toleration for Longhorn UI on nodes allowed to run Longhorn components.

Ingress Settings

Key	Type	Default	Description
ingress.annotations	string	`nil`	Ingress annotations in the form of key-value pairs.
ingress.enabled	bool	`false`	Setting that allows Longhorn to generate ingress records for the Longhorn UI service.
ingress.host	string	`“sslip.io”`	Hostname of the Layer 7 load balancer.
ingress.ingressClassName	string	`nil`	IngressClass resource that contains ingress configuration, including the name of the Ingress controller. ingressClassName can replace the kubernetes.io/ingress.class annotation used in earlier Kubernetes releases.
ingress.path	string	`“/“`	Default ingress path. You can access the Longhorn UI by following the full ingress path {{host}}+{{path}}.
ingress.secrets	string	`nil`	Secret that contains a TLS private key and certificate. Use secrets if you want to use your own certificates to secure ingresses.
ingress.secureBackends	bool	`false`	Setting that allows you to enable secure connections to the Longhorn UI service via port 443.
ingress.tls	bool	`false`	Setting that allows you to enable TLS on ingress records.
ingress.tlsSecret	string	`“longhorn.local-tls”`	TLS secret that contains the private key and certificate to be used for TLS. This setting applies only when TLS is enabled on ingress records.

Private Registry Settings

You can install Longhorn in an air-gapped environment with a private registry. For more information, see the Air Gap Installation section of the documentation.

Key	Description
privateRegistry.createSecret	Setting that allows you to create a private registry secret.
privateRegistry.registryPasswd	Password for authenticating with a private registry.
privateRegistry.registrySecret	Kubernetes secret that allows you to pull images from a private registry. This setting applies only when creation of private registry secrets is enabled. You must include the private registry name in the secret name.
privateRegistry.registryUrl	URL of a private registry. When unspecified, Longhorn uses the default system registry.
privateRegistry.registryUser	User account used for authenticating with a private registry.

OS/Kubernetes Distro Settings

OpenShift Settings

For more details, see the ocp-readme.

Key	Type	Default	Description
openshift.enabled	bool	`false`	Setting that allows Longhorn to integrate with OpenShift.
openshift.ui.port	int	`443`	Port for accessing the OpenShift web console.
openshift.ui.proxy	int	`8443`	Port for proxy that provides access to the OpenShift web console.
openshift.ui.route	string	`“longhorn-ui”`	Route for connections between Longhorn and the OpenShift web console.

Other Settings

Key	Default	Description
annotations	`{}`	Annotation for the Longhorn Manager DaemonSet pods. This setting is optional.
enableGoCoverDir	`false`	Setting that allows Longhorn to generate code coverage profiles.
enablePSP	`false`	Setting that allows you to enable pod security policies (PSPs) that allow privileged Longhorn pods to start. This setting applies only to clusters running Kubernetes 1.25 and earlier, and with the built-in Pod Security admission controller enabled.
metrics.serviceMonitor.enabled	`false`	Setting that allows the creation of a Prometheus ServiceMonitor resource for Longhorn Manager components.
namespaceOverride	`“”`	Specify override namespace, specifically this is useful for using longhorn as sub-chart and its release namespace is not the `longhorn-system`.
preUpgradeChecker.jobEnabled	`true`	Setting that allows Longhorn to perform pre-upgrade checks. Disable this setting when installing Longhorn using Argo CD or other GitOps solutions.
preUpgradeChecker.upgradeVersionCheck	`true`	Setting that allows Longhorn to perform upgrade version checks after starting the Longhorn Manager DaemonSet Pods. Disabling this setting also disables `preUpgradeChecker.jobEnabled`. Longhorn recommends keeping this setting enabled.

System Default Settings

During installation, you can either allow Longhorn to use the default system settings or use specific flags to modify the default values. After installation, you can modify the settings using the Longhorn UI. For more information, see the Settings Reference section of the documentation.

Key	Description
defaultSettings.allowCollectingLonghornUsageMetrics	Setting that allows Longhorn to periodically collect anonymous usage data for product improvement purposes. Longhorn sends collected data to the Upgrade Responder server, which is the data source of the Longhorn Public Metrics Dashboard (https://metrics.longhorn.io). The Upgrade Responder server does not store data that can be used to identify clients, including IP addresses.
defaultSettings.allowEmptyDiskSelectorVolume	Setting that allows scheduling of empty disk selector volumes to any disk.
defaultSettings.allowEmptyNodeSelectorVolume	Setting that allows scheduling of empty node selector volumes to any node.
defaultSettings.allowRecurringJobWhileVolumeDetached	Setting that allows Longhorn to automatically attach a volume and create snapshots or backups when recurring jobs are run.
defaultSettings.allowVolumeCreationWithDegradedAvailability	Setting that allows you to create and attach a volume without having all replicas scheduled at the time of creation.
defaultSettings.autoCleanupRecurringJobBackupSnapshot	Setting that allows Longhorn to automatically clean up the snapshot generated by a recurring backup job.
defaultSettings.autoCleanupSystemGeneratedSnapshot	Setting that allows Longhorn to automatically clean up the system-generated snapshot after replica rebuilding is completed.
defaultSettings.autoDeletePodWhenVolumeDetachedUnexpectedly	Setting that allows Longhorn to automatically delete a workload pod that is managed by a controller (for example, daemonset) whenever a Longhorn volume is detached unexpectedly (for example, during Kubernetes upgrades). After deletion, the controller restarts the pod and then Kubernetes handles volume reattachment and remounting.
defaultSettings.autoSalvage	Setting that allows Longhorn to automatically salvage volumes when all replicas become faulty (for example, when the network connection is interrupted). Longhorn determines which replicas are usable and then uses these replicas for the volume. This setting is enabled by default.
defaultSettings.backingImageCleanupWaitInterval	Number of minutes that Longhorn waits before cleaning up the backing image file when no replicas in the disk are using it.
defaultSettings.backingImageRecoveryWaitInterval	Number of seconds that Longhorn waits before downloading a backing image file again when the status of all image disk files changes to “failed” or “unknown”.
defaultSettings.backupCompressionMethod	Setting that allows you to specify a backup compression method.
defaultSettings.backupConcurrentLimit	Maximum number of worker threads that can concurrently run for each backup.
defaultSettings.backupTarget	Endpoint used to access the backupstore. (Options: “NFS”, “CIFS”, “AWS”, “GCP”, “AZURE”)
defaultSettings.backupTargetCredentialSecret	Name of the Kubernetes secret associated with the backup target.
defaultSettings.backupstorePollInterval	Number of seconds that Longhorn waits before checking the backupstore for new backups. The default value is “300”. When the value is “0”, polling is disabled.
defaultSettings.concurrentAutomaticEngineUpgradePerNodeLimit	Maximum number of engines that are allowed to concurrently upgrade on each node after Longhorn Manager is upgraded. When the value is “0”, Longhorn does not automatically upgrade volume engines to the new default engine image version.
defaultSettings.concurrentReplicaRebuildPerNodeLimit	Maximum number of replicas that can be concurrently rebuilt on each node.
defaultSettings.concurrentVolumeBackupRestorePerNodeLimit	Maximum number of volumes that can be concurrently restored on each node using a backup. When the value is “0”, restoration of volumes using a backup is disabled.
defaultSettings.createDefaultDiskLabeledNodes	Setting that allows Longhorn to automatically create a default disk only on nodes with the label “node.longhorn.io/create-default-disk=true” (if no other disks exist). When this setting is disabled, Longhorn creates a default disk on each node that is added to the cluster.
defaultSettings.defaultDataLocality	Default data locality. A Longhorn volume has data locality if a local replica of the volume exists on the same node as the pod that is using the volume.
defaultSettings.defaultDataPath	Default path for storing data on a host. The default value is “/var/lib/longhorn/“.
defaultSettings.defaultLonghornStaticStorageClass	Default Longhorn StorageClass. “storageClassName” is assigned to PVs and PVCs that are created for an existing Longhorn volume. “storageClassName” can also be used as a label, so it is possible to use a Longhorn StorageClass to bind a workload to an existing PV without creating a Kubernetes StorageClass object. The default value is “longhorn-static”.
defaultSettings.defaultReplicaCount	Default number of replicas for volumes created using the Longhorn UI. For Kubernetes configuration, modify the `numberOfReplicas` field in the StorageClass. The default value is “3”.
defaultSettings.deletingConfirmationFlag	Flag that prevents accidental uninstallation of Longhorn.
defaultSettings.detachManuallyAttachedVolumesWhenCordoned	Setting that allows automatic detaching of manually-attached volumes when a node is cordoned.
defaultSettings.disableRevisionCounter	Setting that disables the revision counter and thereby prevents Longhorn from tracking all write operations to a volume. When salvaging a volume, Longhorn uses properties of the “volume-head-xxx.img” file (the last file size and the last time the file was modified) to select the replica to be used for volume recovery. This setting applies only to volumes created using the Longhorn UI.
defaultSettings.disableSchedulingOnCordonedNode	Setting that prevents Longhorn Manager from scheduling replicas on a cordoned Kubernetes node. This setting is enabled by default.
defaultSettings.disableSnapshotPurge	Setting that temporarily prevents all attempts to purge volume snapshots.
defaultSettings.engineReplicaTimeout	Timeout between the Longhorn Engine and replicas. Specify a value between “8” and “30” seconds. The default value is “8”.
defaultSettings.failedBackupTTL	Number of minutes that Longhorn keeps a failed backup resource. When the value is “0”, automatic deletion is disabled.
defaultSettings.fastReplicaRebuildEnabled	Setting that allows fast rebuilding of replicas using the checksum of snapshot disk files. Before enabling this setting, you must set the snapshot-data-integrity value to “enable” or “fast-check”.
defaultSettings.guaranteedInstanceManagerCPU	Percentage of the total allocatable CPU resources on each node to be reserved for each instance manager pod when the V1 Data Engine is enabled. The default value is “12”.
defaultSettings.kubernetesClusterAutoscalerEnabled	Setting that notifies Longhorn that the cluster is using the Kubernetes Cluster Autoscaler.
defaultSettings.logLevel	Log levels that indicate the type and severity of logs in Longhorn Manager. The default value is “Info”. (Options: “Panic”, “Fatal”, “Error”, “Warn”, “Info”, “Debug”, “Trace”)
defaultSettings.nodeDownPodDeletionPolicy	Policy that defines the action Longhorn takes when a volume is stuck with a StatefulSet or Deployment pod on a node that failed.
defaultSettings.nodeDrainPolicy	Policy that defines the action Longhorn takes when a node with the last healthy replica of a volume is drained.
defaultSettings.offlineReplicaRebuilding	Setting that allows rebuilding of offline replicas for volumes using the V2 Data Engine.
defaultSettings.orphanAutoDeletion	Setting that allows Longhorn to automatically delete an orphaned resource and the corresponding data (for example, stale replicas). Orphaned resources on failed or unknown nodes are not automatically cleaned up.
defaultSettings.priorityClass	PriorityClass for system-managed Longhorn components. This setting can help prevent Longhorn components from being evicted under Node Pressure. Notice that this will be applied to Longhorn user-deployed components by default if there are no priority class values set yet, such as `longhornManager.priorityClass`.
defaultSettings.recurringFailedJobsHistoryLimit	Maximum number of failed recurring backup and snapshot jobs to be retained. When the value is “0”, a history of failed recurring jobs is not retained.
defaultSettings.recurringJobMaxRetention	Maximum number of snapshots or backups to be retained.
defaultSettings.recurringSuccessfulJobsHistoryLimit	Maximum number of successful recurring backup and snapshot jobs to be retained. When the value is “0”, a history of successful recurring jobs is not retained.
defaultSettings.removeSnapshotsDuringFilesystemTrim	Setting that allows Longhorn to automatically mark the latest snapshot and its parent files as removed during a filesystem trim. Longhorn does not remove snapshots containing multiple child files.
defaultSettings.replicaAutoBalance	Setting that automatically rebalances replicas when an available node is discovered.
defaultSettings.replicaDiskSoftAntiAffinity	Setting that allows scheduling on disks with existing healthy replicas of the same volume. This setting is enabled by default.
defaultSettings.replicaFileSyncHttpClientTimeout	Number of seconds that an HTTP client waits for a response from a File Sync server before considering the connection to have failed.
defaultSettings.replicaReplenishmentWaitInterval	Number of seconds that Longhorn waits before reusing existing data on a failed replica instead of creating a new replica of a degraded volume.
defaultSettings.replicaSoftAntiAffinity	Setting that allows scheduling on nodes with healthy replicas of the same volume. This setting is disabled by default.
defaultSettings.replicaZoneSoftAntiAffinity	Setting that allows Longhorn to schedule new replicas of a volume to nodes in the same zone as existing healthy replicas. Nodes that do not belong to any zone are treated as existing in the zone that contains healthy replicas. When identifying zones, Longhorn relies on the label “topology.kubernetes.io/zone=” in the Kubernetes node object.
defaultSettings.restoreConcurrentLimit	Maximum number of worker threads that can concurrently run for each restore operation.
defaultSettings.restoreVolumeRecurringJobs	Setting that restores recurring jobs from a backup volume on a backup target and creates recurring jobs if none exist during backup restoration.
defaultSettings.snapshotDataIntegrity	Setting that allows you to enable and disable snapshot hashing and data integrity checks.
defaultSettings.snapshotDataIntegrityCronjob	Setting that defines when Longhorn checks the integrity of data in snapshot disk files. You must use the Unix cron expression format.
defaultSettings.snapshotDataIntegrityImmediateCheckAfterSnapshotCreation	Setting that allows disabling of snapshot hashing after snapshot creation to minimize impact on system performance.
defaultSettings.storageMinimalAvailablePercentage	Percentage of minimum available disk capacity. When the minimum available capacity exceeds the total available capacity, the disk becomes unschedulable until more space is made available for use. The default value is “25”.
defaultSettings.storageNetwork	Storage network for in-cluster traffic. When unspecified, Longhorn uses the Kubernetes cluster network.
defaultSettings.storageOverProvisioningPercentage	Percentage of storage that can be allocated relative to hard drive capacity. The default value is “100”.
defaultSettings.storageReservedPercentageForDefaultDisk	Percentage of disk space that is not allocated to the default disk on each new Longhorn node.
defaultSettings.supportBundleFailedHistoryLimit	Maximum number of failed support bundles that can exist in the cluster. When the value is “0”, Longhorn automatically purges all failed support bundles.
defaultSettings.systemManagedComponentsNodeSelector	Node selector for system-managed Longhorn components.
defaultSettings.systemManagedPodsImagePullPolicy	Image pull policy for system-managed pods, such as Instance Manager, engine images, and CSI Driver. Changes to the image pull policy are applied only after the system-managed pods restart.
defaultSettings.taintToleration	Taint or toleration for system-managed Longhorn components.
defaultSettings.upgradeChecker	Upgrade Checker that periodically checks for new Longhorn versions. When a new version is available, a notification appears on the Longhorn UI. This setting is enabled by default
defaultSettings.v1DataEngine	Setting that allows you to enable the V1 Data Engine.
defaultSettings.v2DataEngine	Setting that allows you to enable the V2 Data Engine, which is based on the Storage Performance Development Kit (SPDK). The V2 Data Engine is a preview feature and should not be used in production environments.
defaultSettings.v2DataEngineGuaranteedInstanceManagerCPU	Number of millicpus on each node to be reserved for each Instance Manager pod when the V2 Data Engine is enabled. The default value is “1250”.
defaultSettings.v2DataEngineHugepageLimit	Setting that allows you to configure maximum huge page size (in MiB) for the V2 Data Engine.