How many drives fit in 2U?

Dell R740xd: 24 LFF (3.5") front + 4 SFF (2.5") rear = 28 total. HPE DL380 Gen10: 12 LFF front + 4 SFF mid + 2 SFF rear = 18 total. Lenovo SR650: 12 LFF or 24 SFF front + 2 SFF rear.

SAS or SATA for a 2U storage server?

SAS for production (dual-port redundancy, hot-swap). SATA for archive/backup-only deployments. NL-SAS (Near-Line SAS) gives SAS reliability at SATA cost — common pick for large file-storage arrays.

Can a 2U storage server run TrueNAS Scale?

Yes — Dell R740xd is one of the most popular TrueNAS platforms. Pre-flash the HBA (LSI 9300-8i or Dell PERC H330) to IT-mode so ZFS sees raw disks. We do this on request, free of charge.

Best 2U Server for Storage — High-Capacity Buyer's Guide

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Enterprise Storage Hub

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