S4 Storage JBOD
Storage · 4U · Top-Load

The T18 S4.
Density that scales petabytes.

A 4U high-density JBOD chassis for backup, cold-tier, and object stores. Up to 108 drives per chassis with dual-path SAS4 expanders and validated thermals to 40°C — engineered for GCC-scale data platforms.

Drive Bays
90
3.5" hot-swap · top-load.
Raw Capacity
2.2 PB
With 24 TB SAS4 nearline drives.
Fabric
SAS4
24 Gb/s · dual-path expanders.
Uplinks
8× 200Gb
Optional NVMe-oF gateway.
01 — Overview

Cold-tier and warm-tier density, engineered for regional archives.

Top-load, front-serviced

A top-load drive plane makes population and replacement predictable at scale. Front-serviced power, fans, and expanders keep hot-aisle work off the cold aisle.

Dual-path SAS4 throughout

Two independent expander cards feed every drive. A failed expander path is not a failed chassis.

NVMe-oF gateway option

Optional gateway module exposes the chassis as an NVMe-over-Fabrics target for warm-tier workloads that outgrew object storage.

Thermal envelope

Certified 40°C intake fully loaded with 24 TB drives — including the failed-fan derating case documented in the ops bible.

02 — Full Specification

Engineered to the socket.
Documented to the rack.

Configurable options are marked red. Contact engineering for special-order variants.

Chassis & Density
Form Factor4U · 1000mm depth · top-load
Weight142 kg (fully populated, 24 TB HDDs)
Drive Bays108× 3.5" · hot-swap · toolless
Max Raw Capacity2.6 PB · with 24 TB SAS4
Drive SupportSAS4 24Gb · SATA · NVMe (rear cage)
Fabric & Uplinks
Expanders2× SAS4 24Gb · dual-path
SAS Uplinks8× SAS4 x4 · 96 Gb per uplink
NVMe-oF GatewayOptional · 8× 200GbE
ManagementDedicated 1GbE BMC · SES-4
Serviceability
Drive AccessTop plane · toolless caddies
Power2N redundant · front-serviced
Fans6× hot-swap counter-rotating · front
LEDsPer-drive activity + fault
Power & Compliance
PSU2× 3000W Titanium redundant
Input200–240V AC · 380V DC
CoolingFront intake · 40°C certified
03 — Deployment Use Cases

Where the S4 earns its rack unit.

U.01

Backup & Archive

The default cold-tier for banking, government and enterprise backup fabrics.

U.02

Object Storage

Ceph, MinIO, and S3-compatible object stores at PB scale.

U.03

Video & Broadcast Archive

Long-tail broadcast archives across regional media companies.

U.04

AI Training Corpora

Warm-tier for training datasets, paired with AI8-HPC compute nodes.

U.05

Regulatory Retention

BFSI and government workloads with multi-year retention mandates.

U.06

Genomic & Research

Sequencing archives for regional research institutions.

Ready to spec the S4 for your rack?

04 — Related Platforms

The rest of the lineup.