HP
HP 631674-B21 Smart Array P421 2GB External SAS Controller
Enterprise-grade external SAS RAID controller with 2GB flash-backed cache for HP ProLiant Gen8 servers.
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Overview
Maximize External Storage Performance and Data Protection
The HP Smart Array P421 Controller is a high-performance, low-profile RAID controller designed for HP ProLiant Gen8 servers. Featuring 6 Gb/s SAS connectivity, 2GB FBWC, and support for advanced RAID levels, this controller provides enterprise-class storage performance, maximum external scalability, and robust data protection.
- Interface: 6 Gb/s SAS
- Form Factor: Low Profile
- Cache: 2GB FBWC (Flash Back Write Cache)
- Ports: 8 External SAS Ports
- RAID Support: Online RAID level migration, Global online spare, Pre-failure warning
- Compatibility: HP ProLiant Gen8 rack servers and tower servers
Key Features
SAS Controller
plug-in card
PCI Express
Pros & Cons
👍 Pros
- 2GB flash-backed write cache protects data during power loss without battery maintenance
- 8 external SAS ports provide substantial scalability for external storage arrays
- 6 Gb/s SAS interface delivers high throughput for demanding enterprise workloads
- Low-profile form factor fits in space-constrained server chassis
- Online RAID level migration allows reconfiguration without downtime
👎 Cons
- Only compatible with HP ProLiant Gen8 servers, limiting reuse in other hardware
- External-only controller with no internal SAS ports for local drives
- Low-profile design may require a bracket swap depending on server chassis
- Higher cost compared to basic RAID controllers without flash-backed cache
Frequently Asked Questions
Which servers is the HP Smart Array P421 compatible with?
It is designed for HP ProLiant Gen8 rack and tower servers.
What RAID levels does this controller support?
It supports advanced RAID levels with online RAID level migration, global online spare, and pre-failure warning capabilities.
What is Flash Back Write Cache (FBWC) and why does it matter?
FBWC preserves cached data in the event of a power loss by writing it to flash memory, protecting in-flight data without relying on a battery.
How many external SAS ports does the P421 provide?
It provides 8 external 6 Gb/s SAS ports for connecting external storage enclosures.
What form factor is this controller?
It is a low-profile PCI Express plug-in card, suitable for servers with limited expansion slot clearance.
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