Q

How to dodge I/O accelerator installation problems

Proprietary storage accelerators have the advantage of vendor testing and easier installation into server systems, but assurance comes at a premium.

How do I install a storage accelerator on a server?

Some I/O accelerators -- also called storage accelerators -- are server-agnostic and can be installed on any conventional x86 server that meets PCI Express (PCIe) bus requirements. For example, Fusion-io's ioDrive2 units and the P420m from Micron Technology require a PCIe 2.0 four-serial-lane slot. While PCIe slots on modern servers are common, there is little space for a bulky I/O accelerator. Also, there is rarely more than one slot available, so that presents a problem if another PCIe device is installed on the server, such as a multiport NIC adapter.

Some I/O accelerators are server-specific. For example, the HP IO Accelerator for BladeSystem c-Class units is designed for Gen8 HP ProLiant Blade Servers. These accelerators use an interface that will only function in that class of systems. This offers a mixed blessing: Vendor-specific accelerators are easier to install and proper integration is assured, but the units will typically command a premium price tag.

Regardless of the actual installation, it's important to note that storage accelerators are radically different local storage devices compared with conventional disks. Even well-refined and supported storage accelerators could experience operational problems with certain unexpected combinations of hardware and software.

Businesses that choose to adopt storage accelerators generally approach the technology only for specific mission-critical servers, and only after extensive product evaluation and proof-of-principal testing with the actual applications that will use the storage.

This was first published in June 2013

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