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Synology SA3400D Dual-Controller NAS

Model: SA3400D · US configuration

Front three-quarter view of the black Synology SA3400D 2U rack NAS with twelve drive trays; the visible front plaque reads SA3400 without the D suffix.
Official SA3400D product-page image; visible front plaque reads SA3400 (without the D suffix); no drive bundle is shown.

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A 12-bay 2U SAS NAS/SAN system with two active-passive controllers, eight-core Xeon D-1541 processors per controller and expansion to 36 total bays.

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Why consider this model?

  • A business evaluating internal active-passive controller failover alongside SMB/NFS file services and iSCSI/Fibre Channel storage in a twelve-bay SAS system.

Tradeoffs to weigh

  • The SA3400D is a 2U dual-controller SAS appliance, not a consumer NAS. It does not list SATA drives, needs a rack and separate rails, requires exact SAS compatibility checks, and reaches 36 total bays only with separately purchased shelves. Controller failover, RAID protection and backups cover different risks.
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