by Galen Gruman

Rethink Your Storage Infrastructure to Save Money, Simplify Management

Jul 30, 20079 mins
Data CenterVirtualization

Smart IT leaders are using techniques like tiering and iSCSI to consolidate and simplify storage. They're saving money and creating efficiencies at the same time.

When Marty Garrison became CTO of ChoicePoint three years ago, the storage situation was messy. That’s no small matter at a company that manages 16 billion records, such as background checks and insurance applications, eating up two petabytes of storage—that’s 2,048 terabytes. And growing. Like many IT leaders, he faced lots of data in lots of silos. “Storage had grown organically by project, and it was not managed in terms of cost. So we had eight to 10 SAN [storage area network] infrastructures as islands, none of which could talk to each other. We couldn’t share storage space across islands, and we couldn’t tier our data,” he recalls.

The silos meant there could be no cost efficiencies from bulk purchases, from better utilization of the existing storage capacity or from a unified management approach that would lower staffing needs. So Garrison created a central, common storage architecture and strategy. He removed storage management responsibilities from local Unix administrators and hired dedicated storage experts to manage responsibilities globally. He consolidated the SANs into one, reducing management costs and allowing more efficient data utilization. He pared down the vendors to just a couple for each type of technology. That let him simplify management and buy in bulk, to get greater discounts. When you buy hundreds of terabytes of storage each quarter, Garrison says, “it really does drive costs down.”

He also introduced tiering, which uses cheaper, slower drives for data that doesn’t need the highest level of availability. “Before that, we had done no performance testing to determine service requirements. The staff played it safe and got Tier 1 Hitachi and EMC disks for everything,” Garrison recalls—at nearly double the price per terabyte as Tier 2 or Tier 3 disks. Altogether, he has slashed storage costs by 40 percent, both for the disks themselves and for the management overhead. And he’s not had to significantly grow his staff despite escalating storage requirements.

Garrison is now exploring new ways to keep costs in check, including storage virtualization and single-instance storage. “Now it’s time to go into the next phase,” he says.

You must move to a simplified storage architecture to reduce total cost of ownership, analysts say. Even as the cost of new storage media decreases at up to 34 percent annually, the cost of rising capacity and service level demands can exceed 60 percent, says Stewart Buchanan, a research director at Gartner. “Enterprises need more business discipline in IT asset management of storage,” he says.

Lay the Right Foundation

The good news: CIOs have more storage choices, and more mature choices, than they did just a few years ago. Some approaches that were once novel and untested, such as tiered storage and its related archival approach of hierarchical storage management, are now proven, says Nik Simpson, a storage analyst at the Burton Group consultancy. This is also true for the use of SANs.

A Fast Guide to Big Storage Providers

Many of the technologies to support structural storage efficiencies are widely available, such as storage area networks (SANs), disk-to-disk backup (also called virtual tape libraries) and tiered storage. “You can use your existing vendors for these if you don’t want to work with a startup,” says Nik Simpson, a storage analyst at the Burton Group.

Providers of both fibre channel and iSCSI products include 3Par, Compellent, EMC, Hewlett-Packard, Hitachi Data Systems, IBM, Network Appliance (NetApp) and Sun Microsystems. LeftHand Networks and Symantec offer software for such networks, while Sanrad offers an appliance to interlink the two technologies. Providers of iSCSI-only SANs include EqualLogic, Isilon Systems and Pillar Data Systems.

For the recently emerged area of network storage virtualization, mainstream providers include EMC, HP, Hitachi, IBM, LSI, NetApp and Sun. “NetApp and Hitachi are at the top of my list, and IBM is a reasonable third,” says Simpson. Software-only providers include DataCore Software, FalconStor Software, Incipient and Symantec.

In the also emerging area of single-instance storage and deduplication, leading players include Data Domain, Diligent Technologies, EMC, ExaGrid, FalconStor, NetApp, Quantum and Sepaton.

One increasingly popular category of savings comes from replacing tape backup with disk backup (also called virtual tape libraries), says Dave Dillehunt, CIO of the integrated delivery network FirstHealth of the Carolinas. Tape capacity has not kept up with hospital storage requirements—about 185 terabytes at FirstHealth—and physically managing the tapes has become too burdensome, he says. A caveat: One danger in relying on disk-based backup is the temptation to keep the data online (which can overload storage networks, because people will use the data if it is available). That’s why Dillehunt keeps the disk backup disconnected from the rest of the network.

If your storage needs are modest, tape does continue to make sense because the medium cost is so much less, notes Rich O’Neal, senior vice president of operations at the online rewards-tracking site Upromise. That’s the case for his 4 terabytes of data. Of the established approaches, tiering offers the most significant bottom-line benefit, says Gartner’s Buchanan. It not only lets you increase the amount of cheap storage relative to expensive storage that you use but also forces you to understand the service levels for all your data. Then you can reduce costs by deleting or at least not backing up unneeded data. You can move rarely used data to offline storage to keep network traffic under control. And you can begin to manage demand by users, by showing them the entire data lifecycle costs for their requested applications. “Tiering lets you find the total cost of ownership of your storage,” he says.

A good target: Keep 30 percent of your data in Tier 1 storage and the rest at lower tiers, advises Burton Group’s Simpson, though the exact ratio depends on the performance and availability requirements for your data.

It’s critical for the CIO to make sure that business takes responsibility for its data demands. “It’s not the role of the storage team to define the data requirements—that has to go to business management,” Buchanan says. But the CIO has to lay the groundwork by having effective asset management in place and exhibiting efficiency.

Cheaper Storage Networks Through iSCSI

Among newer technologies that can help reduce storage costs, the most notable in recent years is iSCSI (Internet Small Computer System Interface). A type of storage that connects drives to each other and to servers using a simple, easy-to-manage protocol, it lets organizations of all sizes deploy SANs. Before iSCSI, the major SAN option was fibre channel, but “fibre channel is not suited outside larger enterprises,” Simpson notes, because of its complexity and its high management cost.

The simplicity and fit of iSCSI for a larger range of organizations make it the fastest-growing interconnect technology for storage, reports IDC (a sister company to CIO’s publisher); the research firm expects 25 percent of all external storage sold in 2011 to be iSCSI-based.

Regional accounting firm Schenck Business Solutions dropped its EMC fibre channel array three years ago because of its complexity, replacing it with an EqualLogic iSCSI-based SAN. “We had struggled with configuration and day-to-day usage,” recalls CIO Jim Tarala. Since then, the company’s storage capacity has increased about 330 gigabytes to 20 terabytes. But he’s got a handle on overall cost. “We spent approximately 120 percent of what we did on the EMC gear (330 gigabytes) to get the EqualLogic (20 terabytes) and our management costs are a maximum of 60 to 65 percent of what they were previously,” Tarala says. He expects to upgrade the storage to 30 terabytes soon.

Associated Bank, which serves several Midwestern states, had a similar experience. In 2005, it needed to rethink its storage strategy to prepare for volumes of expected image data such as electronic check images and customer records, since the bank was implementing a program to let customers start an application at one branch and finish it at any other. When the storage initiative began in 2005, the bank had about 20 terabytes of data; it now has 300 terabytes.

The bank built its SAN using iSCSI arrays because it wanted an IP-based network to take advantage of its staff’s existing networking skills, recalls Preston Peterson, the assistant vice president of infrastructure design. Still, just in case fibre channel becomes necessary later on, the bank made sure its Compellent storage arrays could support both fibre channel and iSCSI.

The move to iSCSI did raise questions, notes Kory Kitowski, the bank’s vice president of IT. For example, engineers from Microsoft and other vendors weren’t familiar with iSCSI, so they questioned unfamiliar server and SAN settings when installing or troubleshooting their own products. Internally, despite having IP-savvy IT staff, the bank still needed to reeducate the storage administrators. “We went through a major paradigm shift,” Kitowski says.

But the result was a 30 percent overall savings to what they had expected to spend using traditional SANs, Peterson says.

Even within large enterprises, there’s no longer a need to rely solely on fibre channel, says ChoicePoint’s Garrison, who uses either iSCSI or fibre channel, based on the specific storage’s availability needs.

Prepare for the Next Wave

As enterprises get these structural changes in place, both Simpson and Buchanan advise that, for further savings, CIOs should begin looking at two emerging technologies: network storage virtualization and single-instance storage. Network storage virtualization moves management out of the arrays and other disk hardware, and implements it as part of the SAN’s operating environment. This lets IT treat all the disks as a virtual resource pool.

Single-instance saves on storage by keeping just one copy of data in your frontline systems (such as application servers), substituting pointers to the source for any copies, while the related deduplication technology saves just one copy of a file or data block during backup or archiving and substitutes pointers for any later copies found. Long available for e-mail servers, single-instance technology is becoming available as a feature both in backup and archival systems and in frontline storage systems, notes Burton Group’s Simpson.

But several factors limit these technologies’ adoption, says Gary Fox, national practice director for the consultancy Dimension Data.

Fox says that network storage virtualization technology proves complex to manage, despite vendors’ characterization of it as plug-and-play.

As for single-instance storage technology, data loss worries surround the pointer approach; most companies are in pilot mode for it, Fox says. Also, the technology comes primarily from startup vendors, though Fox expects that to change. Still, despite its nascency, “We see a lot of interest from clients,” he says. After all, they also foresee continued unbridled storage growth.

Galen Gruman is a frequent contributor to CIO. You can reach him at