For shared hypervisor storage over iSCSI, keep three jobs separate: the storage target exports a LUN, the network provides the paths, and each hypervisor host configures its initiator and multipath behavior. TrueNAS provides a managed target platform; Linux LIO/TCM is a framework for building an iSCSI target. Neither choice configures the host and network redundancy by itself.
How the iSCSI roles fit together
iSCSI carries SCSI block-storage traffic over an IP network. The target presents a logical unit, or LUN; the initiator discovers the target and logs in. In the TrueNAS VMware integration, TrueNAS is the target and each ESXi host is an initiator.
An iSCSI Qualified Name (IQN) identifies an iSCSI endpoint in configuration and access rules. The host must be able to discover the target, authenticate as configured, and be permitted to access the exported storage. Discovery may use dynamic SendTargets discovery or manually configured static discovery; the TrueNAS VMware guide documents both approaches.
Choose a target that fits your operating model
| Dimension | TrueNAS | Linux LIO/TCM |
|---|---|---|
| What it is | A storage platform with a managed iSCSI interface. TrueNAS iSCSI documentation | An in-kernel Linux SCSI target framework with fabric and backstore components. Linux kernel TCMU design documentation |
| Storage behind the target | Configured through TrueNAS-managed storage objects; the cited material does not establish a universal backend or performance comparison. | Backstores can include files, block devices, RAM, or another SCSI device. TCMU provides a userspace route for backends awkward to implement in kernel code. These options are not interchangeable in durability or performance. Linux kernel TCMU design documentation |
| Who manages configuration | Storage-platform administration, with controls and behavior dependent on the installed TrueNAS release. | Linux distribution and service configuration, alongside the target framework and chosen backend. |
| Hypervisor compatibility | Validate the specific TrueNAS and hypervisor releases against current support documentation; the VMware guide describes its TrueNAS/ESXi integration. | Validate the selected Linux distribution, target implementation, and hypervisor initiator together. No universal compatibility matrix is established here. |
| Performance or cost winner | Not established by the cited documentation. | Not established by the cited documentation. |
Choose based on who will operate the target, which storage backend and lifecycle process you can support, and whether the exact host-target combination is supported. The available documentation does not establish a universal speed, cost, reliability, or ease-of-use winner.
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Design multipath across the whole connection
Multipath I/O (MPIO) means multiple physical paths between an initiator and a target. TrueNAS describes reliability and potential I/O distribution as purposes of MPIO, but realized behavior depends on endpoint and path configuration. Configure both the target and every host initiator; adding extra target addresses alone is not a complete multipath design.
- Define the failure domains. Decide which link, switch, or other network failure the design should tolerate. For the paths to provide meaningful redundancy, they need to be independent through the parts of the network whose failure you intend to withstand. This is a topology principle implied by the requirement for multiple physical paths, not a universal prescribed topology.
- Provide target-side portals. TrueNAS’s networking guidance calls for additional iSCSI portal IP addresses for MPIO. Keep the separate paths visible and manageable in the target and host configuration.
- Configure host-side paths. Set up the initiator and multipath behavior on each hypervisor according to its own release-specific documentation. A target-side setting cannot substitute for this.
- Do not substitute link aggregation for iSCSI MPIO. TrueNAS explicitly recommends MPIO rather than LAGG for iSCSI. TrueNAS networking recommendations
Hardware is a design choice, not a documented universal requirement: an Ethernet adapter may be useful when a host needs more interfaces for distinct paths, but the cited guidance specifies no required adapter model or speed. Likewise, do not enable jumbo frames on assumption alone. TrueNAS cautions that they can increase throughput but may measurably increase latency on some unoptimized switch ASICs, and says latency is often more important than throughput for VMware. Validate MTU end to end and test with the workload before adopting them. TrueNAS networking recommendations
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Keep target HA, ALUA, and network paths distinct
These mechanisms address different parts of an outage:
- Target high availability: TrueNAS describes its dual-controller HA design as active/standby.
- ALUA: TrueNAS says its iSCSI support for Asymmetric Logical Unit Access communicates asymmetric access characteristics and can reduce failover time. That is a product capability statement, not a guarantee of a particular recovery interval.
- Host multipath: The initiator manages the multiple paths it can see and use.
- Network redundancy: The network must preserve the independent paths the design depends on.
Controller HA or ALUA does not remove the need to configure host paths and network redundancy appropriate to the deployment. TrueNAS also states that a properly configured HA system can offer “up to 5x 9’s” availability; its documentation does not provide a measurement method or independent validation alongside that product claim. Do not treat it as a guaranteed uptime figure for a particular installation. TrueNAS VMware integration
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Configure discovery, authentication, and access control
For a TrueNAS target, the VMware guide frames connection setup around three controls: discovery, authentication, and access rules. Decide on them together so that a host can find the target, prove its identity, and access only the storage it is meant to use.
- Discovery: Choose dynamic SendTargets discovery or configure static discovery entries, according to the host and target configuration.
- CHAP: Unidirectional CHAP authenticates the target to the initiator; bidirectional CHAP authenticates both sides. TrueNAS usually recommends bidirectional CHAP, while noting its extra setup and troubleshooting overhead. Keep secrets out of shared configuration examples and operational logs.
- Access rules: TrueNAS documents restrictions based on initiator IQN, IP address, or CHAP username. Apply rules narrowly to the hosts and identities that need access.
The TrueNAS Documentation Hub puts the trade-off this way: “For this reason, bidirectional CHAP is usually recommended but requires additional configuration and comes with greater administrative overhead when troubleshooting iSCSI connections.” TrueNAS VMware integration
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Apply hypervisor-specific guidance without treating it as universal
VMware ESXi with TrueNAS
Follow the integration guidance for the installed releases when configuring ESXi discovery, authentication, access, and paths. TrueNAS advises setting VMware guest disk timeouts to a minimum of 300 seconds in the datastore context described by that guide, to better tolerate long restarts or delayed disk operations. This is a TrueNAS recommendation for that VMware context, not a universal timeout for other hypervisors or guest operating systems. TrueNAS VMware integration
Proxmox VE and the TrueNAS plugin example
The TrueNAS Proxmox plugin configuration reference includes a target IQN and discovery portal, optional extra portals, and a multipath setting. Its example configuration shows tn_use_multipath 1. This is guidance for that plugin, not a requirement for every Proxmox deployment or a substitute for understanding Proxmox’s native storage configuration. Check the installed plugin version and current compatibility before using its parameters. TrueNAS Proxmox plugin configuration reference
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Linux hosts using a Linux target
LIO/TCM describes the target side; a hypervisor or Linux host still has to configure its own initiator and multipath behavior. The kernel architecture documentation explains fabrics, backstores, and TCMU, but does not prescribe one distribution-independent setup sequence or establish that all backends are suitable for production. Use documentation for the chosen distribution, target backend, and host release.
Validate before putting shared storage into service
- Confirm the target IQN, portal addresses, exported LUN, host initiator identities, and access rules agree.
- Verify the intended authentication mode on both sides and ensure credentials are handled through the site’s approved secret-management process.
- Check that each expected path is visible to the initiator and that the paths traverse the intended independent network components.
- Test the relevant link and controller failure scenarios under controlled conditions before relying on redundancy. Do not infer a recovery time from the existence of MPIO, ALUA, or HA.
- Record the platform release, hypervisor release, target configuration, plugin version if applicable, and upgrade owner so future changes can be validated against the same combination.
No universal Ethernet speed, adapter model, queue setting, block size, or TrueNAS-versus-LIO performance result follows from the cited documentation. Performance decisions need the actual workload, host, NICs, switches, storage media, backend, and release versions.
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