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Make sense of iSCSI.

iSCSI Hub
Independent · 2026
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setup-guides

How to Set Up an iSCSI Target on TrueNAS: Zvol to Login

Set up an iSCSI target on TrueNAS 25.10: create a zvol, run the block share wizard, lock it to one IQN with CHAP, then connect from Linux or Windows.

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iSCSI hands a client a raw disk instead of a share, and almost every problem people hit with it comes from that one difference. These four pages cover it in the order the questions usually arrive.

The guides cover iSCSI SAN targets, MPIO multipathing and LUN provisioning. Begin with the ownership model, choose the protocol your application needs, then follow the target and client configuration for your platform. For an existing connection problem, start with the troubleshooting guide and the message your initiator reports.

  1. 1 · Understand it
    What is an iSCSI LUN?

    What an IQN identifies, what a LUN really is, and why MPIO and link aggregation are not the same mechanism.

  2. 2 · Decide
    iSCSI vs NFS vs SMB

    Block or file, and what changes with it: locking, path redundancy, authentication and how each one behaves when the storage disappears.

  3. 3 · Build it
    iSCSI target setup on Unraid, TrueNAS and Synology

    Unraid plugin and pool placement, TrueNAS zvol mappings, Synology SAN Manager, and connecting Proxmox as an initiator.

  4. 4 · Fix it
    Login, timeout and path errors

    Portal, discovery, login, ACL, CHAP, MTU, then the timers that decide when a dead path becomes a filesystem error.

iSCSI Throughput and MPIO Calculator Free, in-browser: path count, block size and media class against the link ceiling.

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