Broadcom LSI 9211‑4i PCIe2.0 IT‑Mode Internal‑Only SAS Host Bus Adapter

Basic Parameter Table

Core Product Features

1. PCIe 2.0 low‑profile internal‑only HBA (Host Bus Adapter) built‑on SAS2004 chip, factory‑flashed to native IT pass‑through firmware. It has no hardware‑RAID function, forwarding raw disk data directly to the host OS, ideal for small‑scale ZFS, TrueNAS, FreeNAS, unRAID NAS systems.
2. PCIe 2.0 x4 bandwidth, one SFF‑8087 internal port supporting up to 4 SATA/SAS hard‑disk drives mounted inside the server chassis. The PCI‑E x4 form‑factor fits in low‑power, compact ITX and small‑form‑factor servers.
3. IT‑mode pass‑through design lets the operating system manage each disk individually for software‑defined‑RAID (ZFS‑RAID‑Z, md‑raid). There is no onboard cache or hardware‑RAID processing.
4. Fan‑less passive black heat‑sink, zero‑noise operation, stable for 24/7 continuous long‑term runtime in compact home‑lab storage servers. It includes full‑height and low‑profile mounting brackets.
5. Supports hot‑swap for internal hard‑drives; all disks are presented directly to the host operating system.
6. Primary use‑case for 4‑bay compact NAS, mini‑ITX home‑lab storage, secondary server drive expansion.

Application Scenarios

• Compact 4‑bay ZFS/TrueNAS NAS systems with only internal chassis‑mounted hard disks
• Mini‑ITX low‑power home‑lab storage servers
• Secondary drive expansion for small‑scale file servers
• Budget‑entry media‑archival NAS