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  "path": "/threads/proxmox-truenas-10gbe-vm-storage-performance-much-lower-than-expected.2633847/",
  "publishedAt": "2026-02-16T09:32:03.000Z",
  "site": "https://forums.anandtech.com",
  "tags": [
    "Computer Building",
    "Read more"
  ],
  "textContent": "Hello,\n\nI’m in the process of refining my home lab setup and I’ve hit a performance issue that I can’t quite explain.\n\nCurrent layout:\n\n\n  * Host: Ryzen 7 5700X, 128GB DDR4 ECC UDIMM\n  * Motherboard: B550 chipset\n  * Hypervisor: Proxmox VE 8.x\n  * Storage HBA: LSI 9300-8i (IT mode)\n  * Pool: 6× 8TB SATA HDD (RAIDZ2)\n  * Cache: 2× NVMe (mirrored, used as special device + metadata)\n  * Network: Mellanox ConnectX-3 10GbE (direct attach)\n\nTrueNAS SCALE is running as a VM under Proxmox. The HBA is passed through via PCIe passthrough (IOMMU enabled, no grouping issues). TrueNAS pool health is good, no SMART errors.\n\nThe issue:\nWhen testing directly inside the TrueNAS VM (local pool), I see expected sequential speeds (900–1000 MB/s read, 600–700 MB/s write).\n\nHowever, when accessing the same storage over SMB from another 10GbE machine, I’m only getting 350–400 MB/s reads and 250–300 MB/s writes.\n\nThings I’ve already checked:\n\n\n  * MTU 9000 enabled on both ends\n  * Verified 10Gb link is...\n\n\nRead more",
  "title": "Proxmox + TrueNAS + 10GbE - VM Storage Performance Much Lower Than Expected"
}