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David Lawson
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Controller replacement was straightforward and system stayed stable.
Q8F73A
HPE NS CS300 Spare Controller
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Q8F73A
HPE NS CS300 Spare Controller
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Q8F73A is a NAS that incorporates a 16-bay design supporting SATA HDD, SAS HDD, SATA SSD, and NVMe SSD drive types with a total storage capacity of up to 256 TB. It delivers robust RAID configurations including RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, RAID 50, RAID 60, and JBOD, ensuring dependable data protection and redundancy.
Q8F73A is powered by an Intel Xeon processor with 8 cores and comes pre-installed with 16 GB of DDR4 memory, expandable up to 64 GB. The system provides versatile connectivity via USB 3.2, Ethernet 10GbE, and Fibre Channel interfaces and is engineered for high-performance use cases such as SMB backup, enterprise data centers, virtualization, and media servers. It also features expansion support, a redundant power supply with a 250W wattage rating, active cooling, and overall system redundancy.
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In enterprise SAN environments, the Q8F73A-HPE NS CS300 Spare Controller remains pre-staged to automatically assume control if a primary controller fails. This ensures sub-60-second failover, sustains 99.999% availability and protects business continuity with zero manual intervention.
For distributed branch offices, deploying a local Q8F73A-HPE NS CS300 Spare Controller enables immediate hardware replacement upon controller failure, bypassing multi-day shipping delays. Organizations achieve RTOs under two hours, maintain regulatory compliance and minimize productivity loss.
In VDI and server virtualization clusters, the Q8F73A-HPE NS CS300 Spare Controller supports hot-swap replacement without service disruption, preserving peak IOPS under heavy VM consolidation. This approach delivers consistent performance SLAs, optimizes resource utilization and reduces maintenance windows.
To get the detailed certification, please go to the Compliance Center.
 Q8F73A |  Q8D35A |  Q8B79A |  Q8B70A |  Q8B71A | |
|---|---|---|---|---|---|
| Product Type | Storage System | Storage System | Storage System | Storage System | Storage System |
| Storage Type | NAS | SAN | SAN | SAN | SAN |
| Form Factor | Rackmount | Rackmount | Rackmount | Rackmount | Rackmount |
| Bay Count | 16-bay | 24-bay | 8-bay | 8-bay | 16-bay |
| Supported Drive Types | SATA HDD / SAS HDD / SATA SSD / NVMe SSD | Mixed | SATA HDD / SAS HDD / SATA SSD / NVMe SSD | Mixed | Mixed |
| Hot-Swap Support | Yes | Yes | Yes | Yes | Yes |
| Max Supported Capacity | 256 TB | 1 PB | 512 TB | 512 TB | 256 TB |
| RAID Support | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 / RAID 50 / RAID 60 / JBOD | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 | RAID 0 / RAID 1 / RAID 5 / RAID 6 / RAID 10 |
| CPU Type | Intel Xeon | Intel Xeon | Intel Xeon | Intel Xeon | Intel Xeon |
| CPU Cores | 8 | 8 | 8 | 8 | 8 |
| Installed RAM | 16 GB | 16 GB | 16 GB | 16 GB | 16 GB |
| Max RAM Capacity | 64 GB | 128 GB | 64 GB | 32 GB | 64 GB |
| RAM Type | DDR4 | ECC DDR4 | ECC DDR4 | ECC DDR4 | ECC DDR4 |
| Network Ports | 10GbE | 10GbE | 10GbE | 10GbE | 10GbE |
| LAN Ports | 4 | 4 | 4 | 4 | 4 |
| USB Ports | USB 3.2 | USB 3.2 | USB 3.0 | USB 3.2 | USB 3.2 |
| Expansion Support | Yes | Yes | Yes | Yes | Yes |
| Cooling | Active | Redundant Fan | Active | Redundant Fan | Active |
| Power Supply | Redundant | Redundant | Redundant | Redundant | Redundant |
| Power Supply Wattage | 250W | 750W | 350W | 350W | 500W |
| Operating System | Custom OS | Custom OS | Custom OS | Custom OS | Custom OS |
| Snapshot Support | Yes | Yes | Yes | Yes | Yes |
| Cloud Sync Support | Yes | Yes | Yes | Yes | Yes |
| Virtualization Ready | Yes | Yes | Yes | Yes | Yes |
| iSCSI Support | Yes | Yes | Yes | Yes | Yes |
| Surveillance Support | No | No | No | No | No |
| Use Case | SMB / Enterprise Data Center / Virtualization / Media Server | Enterprise Data Center | Enterprise Data Center | Enterprise Data Center | Enterprise Data Center |
| Product Name | Q8F73A Storage Appliance | Q8D35A Enterprise Storage Array | Q8B79A Enterprise SAN Storage System | Q8B70A Storage Appliance | Q8B71A Enterprise Storage System |
| Height | 3.5 inches | 3.5 inches | 3 inches | 3.5 inches | 3.5 inches |
| Width | 17.3 inches | 17.5 inches | 17 inches | 17.5 inches | 17.2 inches |
| Depth | 28.7 inches | 28.0 inches | 28 inches | 27 inches | 25.0 inches |
| Weight | 35 lbs | 45 lbs | 45 lbs | 25 lbs | 45 lbs |
Controller replacement was straightforward and system stayed stable.
Reliable spare controller for business critical storage.
No issues after deployment in production.
Met expectations for enterprise reliability.
Good experience with quick recovery time.
The HPE NS CS300 Spare Controller (Q8F73A) is a factory-qualified failover controller module for HPE CS300 storage arrays, designed to restore redundancy and performance after a controller failure.
The Q8F73A spare controller is fully compatible with HPE NS CS300 and CS300-S Dual-Controller Storage Systems in all supported firmware releases.
Your CS300 management console will display a critical controller fault message and degrade I/O performance when a primary or secondary controller fails, indicating the need for a spare replacement.
Yes, the Q8F73A controller is hot-swappable and can be replaced without shutting down the storage array or interrupting host access.