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Storage Controllers

Storage controllers manage data exchange between a server and connected storage devices. These are necessary in data environments for RAID protection, cache management and real-time monitoring of connected drives.

At ITinStock, we stock a range of high-quality refurbished storage controllers from leading manufacture's, including Dell, Fujitsu, HPE, IBM and NetApp amongst others.
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The Benefits of Storage Controllers

The most important benefit of a storage controller is RAID protection. Rather than leaving data spread across a single drive with no redundancy, RAID controllers stripe, mirror, or apply parity across multiple drives to protect against drive failure. Some types, like the HPE Smart Array P408i-a and P816i-a Gen10 controllers, even act as both a RAID controller and an HBA at the same time, which eliminates the cost of purchasing a second card for environments that need both.

Storage controllers have other beneficial functions too, like dramatically improving I/O performance thanks to its onboard cache memory. At an enterprise level, storage controllers become the intelligence at the heart of an entire storage platform. For example, Hitachi VSP G-Series controllers can deliver built-in active-flash tiering that automatically moves data between flash and disk tiers in real time.

Why Choose a Refurbished Storage Controller?

At ITinStock, we are happy to discuss any bespoke configurations for your storage controller requirements, whether that’s a specific RAID card for an existing server, a replacement controller module for a storage array, or a complete controller head for a NetApp or Hitachi VSP environment. Each of our refurbished storage controllers undergoes rigorous testing to confirm optimal functionality. We can deliver quickly to the UK and worldwide using our courier partners. Our expert support team are on hand to help with any pre-sales questions, and compatibility queries.

Complement Your Storage Controller

Maximise your storage investment with these complementary IT components:

  • Rack Servers We stock refurbished servers from plenty of well-known brands such as Dell PowerEdge, HPE ProLiant, IBM System x, and Fujitsu PRIMERGY.
  • Storage Enclosures Pair your storage controller with a compatible disk enclosure or JBOD shelf to expand capacity. We stock enclosures from HPE, Dell, Fujitsu, NetApp, and more.
  • Networking Equipment Whether you need Fibre Channel switches, SAS cables, HBA cards, or Ethernet networking to connect your storage environment, we stock a wide range of compatible equipment.

Frequently Asked Questions

What is a storage controller and what does it do?
A storage controller is the hardware component that manages all data transfers between a server’s CPU and its storage devices. It handles the translation of I/O commands from the operating system into the specific protocols required by the connected storage media like SAS, SATA, Fibre Channel, or NVMe. Beyond basic data transfer, modern storage controllers also manage RAID configurations to protect data across multiple drives, maintain onboard cache memory to accelerate read and write operations, perform background data integrity checks, monitor drive health via S.M.A.R.T., and support hot-spare drives for automatic rebuilds following a drive failure. In enterprise environments, dedicated storage array controllers (such as those found in NetApp FAS or Hitachi VSP systems) additionally manage complex functions like storage virtualisation, thin provisioning, snapshot creation, and replication.

What is the difference between a RAID controller and an HBA?
A RAID controller and a Host Bus Adapter (HBA) both connect a server to its storage devices, but they serve different purposes. A RAID controller has its own dedicated processor and cache memory, and it manages the creation and maintenance of RAID arrays in hardware, such as striping, mirroring, or applying parity across multiple drives independently of the server’s CPU. An HBA, by contrast, is a simpler pass-through card that presents drives individually to the operating system, with any RAID or data management handled in software. For most production workloads, a hardware RAID controller is preferable because it offloads processing from the server CPU and provides faster, more reliable rebuild performance. Some controllers can operate in ‘Mixed Mode’, running as both a RAID controller and an HBA simultaneously, which gives administrators the flexibility to use hardware RAID for some drives and pass-through for others without needing two separate cards.

Are storage controllers compatible with any server, or do they need to match the brand?
It depends on the type of controller. PCIe-based RAID controllers (such as the Dell PERC H700, HPE Smart Array P408i-p, IBM ServeRAID M5210, and Fujitsu PRAID EP420i) are technically PCIe add-in cards and will physically fit into any server with a compatible PCIe slot. However, they are generally optimised and certified for use with their own vendor’s server platforms. Dell PERC controllers, for instance, are tested and supported specifically with Dell PowerEdge servers, and using them in a third-party server may result in limited or no vendor support. Controllers that are integrated into storage array enclosures (like NetApp FAS controllers or Hitachi VSP controllers) are always proprietary to their respective array platforms and cannot be swapped between brands. When ordering from ITinStock, our team will confirm compatibility against your specific server model and generation before dispatch.

What RAID levels should I use for my storage environment?
The right RAID level depends on your priorities across performance, redundancy, and usable capacity. RAID 1 (mirroring) is the simplest, which is where data is duplicated across two drives, so you lose half your raw capacity but gain full redundancy. RAID 5 distributes parity across three or more drives and can survive a single drive failure with less capacity overhead than RAID 1, making it a good choice for general-purpose file and application storage. RAID 6 adds a second parity drive, tolerating two simultaneous drive failures, which is better suited to large arrays where the risk of a second failure during a rebuild is meaningful. RAID 10 (a striped mirror) combines the performance of striping with the redundancy of mirroring and is the preferred choice for high-transaction database workloads. RAID 50 and 60 extend these principles across multiple parity groups for very large drive counts. Most enterprise controllers in our range, including the Dell PERC H700, HPE Smart Array P408i-a, and IBM ServeRAID M5210, support all these levels as standard or via optional upgrades.

What testing do you do for refurbished storage controllers?
All refurbished storage controllers from ITinStock are thoroughly tested prior to dispatch. Our engineers verify all ports, interface connections, cache memory modules, and RAID functionality to ensure the controller performs to its original specification. For array-level controllers such as NetApp FAS filer heads or Hitachi VSP controllers, we verify the controller’s management interfaces and failover functionality where applicable. Each controller ships with warranty coverage included as standard, with extended warranty options available for organisations that require longer coverage periods or enhanced support levels. We are confident in the quality of every unit we supply, which stems from rigorous testing prior to delivery.

Find Your Ideal Storage Controller Today

Browse our complete range of refurbished storage controllers, or contact our team for expert advice on selecting the right controller for your infrastructure.

Phone: +44 (0)20 4631 3555
Email: hello@itinstock.com

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