The Evolution of Storage – 2012 Isn’t Just the Year of the Dragon

2012 is quickly shaping up to be an exciting year in a variety of technology verticals. Just last week NVIDIA® announced a new production release of their CUDA computing toolkit, accelerating GPU computing. Meanwhile, everyone is excitedly awaiting the launch of the new Intel products shipping towards the end of Q1.

But of all the areas in tech innovation, storage may be the one to set itself apart this year. Yesterday Computerworld ran a very thorough and informative piece titled “2012: The year storage becomes a celebrity,” in which they laid out some of the things to look forward to in the development of enterprise storage this year.

The Overview

While data storage has always been a necessary building block for technology, it’s rarely garnered as much attention as it has in the past two years. The reason: Corporate and retail consumers are being forced to store greater amounts of data and they need to make that data more useful — and accessible.

Enterprise storage, and storage in general, is one of those things that trends dictate will get increasingly cheaper. That doesn’t always mean that it will become more accessible, as storage needs may outpace dropping costs. However, in general storage has become more and more affordable, making a big difference to smaller and even mid-sized organizations. It’s also something that is shared across all industries almost without exception. Storage is not just an “IT” issue, but rather plays a critical role in healthcare, entertainment, finance, engineering, etc.

And ten years ago, we did not have the wide variety of options we do today…

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How a SAS switch can improve storage management

LSI SAS 6Gb/s switch and accessoriesLast week, LSI announced their release of “the industry’s first 6Gb/s SAS switch”. The switch offers unique opportunities for cluster managers to improve the architecture of their storage systems.

The value of the SAS switch is its function of transforming a cluster from a NAS (network-attached storage) structure into a DAS (direct-attached storage) structure. With DAS, storage data does not have to be transferred from the SAS protocol to the network protocol (Ethernet or InfiniBand) and back to SAS. The bottleneck of the middle step is eliminated – the LSI switch allows all I/O of data to happen through just the SAS protocol. This is especially useful for clusters which have or plan to upgrade to 6Gb/s RAID controllers – their throughput will be increased when connected to a 6Gb/s switch rather than to a network.

Another advantage of switching to a DAS configuration for a cluster is it migrates the RAID controllers from the storage nodes to the compute nodes. In a NAS cluster, each storage node typically has its own RAID controller which communicates with the compute nodes through a network. In a DAS cluster with a SAS switch, the storage nodes are JBODs (“Just A Bunch Of Drives” – essentially hard drive warehouses without other computing components within their chassis) that are all accessed by RAID controllers located directly inside the compute nodes.

This configuration separates the RAID controllers from the storage drives and centralizes each of them for simpler management and improved performance. Now, as many RAID controllers as the cluster administrator decides can access any quantity of drives on separate JBOD-based storage. The process that allows this kind of interaction is known as SAS zoning and is illustrated in the diagram below:

Diagram showing the DAS configuration of a cluster with a SAS switch

Diagram showing the DAS configuration of a cluster with a SAS switch, RAID controllers located on the compute nodes, and SAS zoning of the JBOD storage nodes.

For more detailed information about the various uses of the LSI 6Gb/s SAS switch, read their white paper about this product. As storage technology continues to evolve, new solutions such as a DAS cluster configuration with a 6Gb/s SAS switch are helping overcome the various I/O bottlenecks that hamper computing performance.