By Angus Kidman, Technology & Business Magazine
11 September 2002
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Storage navigation: Introduction Networking Software is the key Outsourcing? Value for money Executive summary NAS-SAN convergence The mobile challenge IP Storage-what's it mean? Where is NAS needed? |
Network it baby, yeah!
-Storage technology is in some ways a very immature market, because there's still a high rate of innovation," says Clive Gold, ANZ marketing director for EMC.
Yet that innovation is not always in areas of high customer demand. -Nobody's knocking down our doors and saying they need a faster subsystem or more capacity," said Gold.
The main area of development in storage hardware in recent years has been the move towards networked storage solutions. -Organisations are looking for a more holistic view of their storage assets, and are looking to connect islands of storage with new, lower-cost interconnect options," says Simon Elisha, senior systems engineer for Veritas.
Overriding all of this is the need to make the management of all of this storage cheaper. The move to networking is seeing a decline in simple direct attached storage, though not to the point where it is becoming obsolete.
-I don't see direct attached storage dying out, but people will be networking storage devices almost universally," says Titterington. In Johnson's view, -Direct attached storage still has a place, in test environments and in standalone storage."
Another important market is in notebook users, who have unique backup needs (see -The mobile challenge" sidebar).
Once committed to a networked system, the dominant debate in recent years has been over two approaches with disturbingly similar acronyms: storage area networks (SAN) and network attached storage (NAS). Storage area networks allow any-to-any connections between servers and back-end storage, blurring the distinction between individual devices, while NAS simply makes storage devices network accessible.
While vendors have promoted both technologies as rivals, the truth is a little less dramatic. -NAS versus SANâ€"that argument is going away," said Christian.
In Elisha's view, -SAN is by far the most effective solution for most enterprise storage requirements, particularly for database applications. NAS has a place as a file server on steroids, but the rush to host all applications on NAS devices is a little premature."
-SAN and NAS are potentially quite complimentary," says Titterington. -SAN is a very bulk, heavy-duty, low-level type service. Once you've got it up and working, it's robust, reliable, and can handle large volumes of data. It's mostly used within a data centre or within one site. You're looking at LAN scale rather than WAN scale. NAS works at the file level and can connect to any other network. You can just use Ethernet for it if you're not doing particularly high volumes. And you could have a SAN behind it; NAS can be used as a gateway into the SAN."
SANs are also working their way further down the enterprise food chain. -I don't think company size plays a part in choosing a SANâ€"resources, infrastructure, and budget are the key indicators," says Johnson. That doesn't mean that either family of products are ready for true mass-market adoption. -The current products are not very friendly," according to Titterington. -There's a lack of interoperability. Most companies have lots of different equipment for historical reasons, but it tends to mean the first thing you need is an interoperability lab."
Titterington estimates you can easily spend 10 percent of a SAN-related budget on trials and tests.
-NAS is a cheaper and easier option, but SANs offer better security," says Alvin Ong, regional sales manager for Maxtor.
Not everyone is convinced. -The inbuilt security mechanisms for SANs are pretty crude," says Titterington. -It's supposed to limit via server zones, but it's alleged that even that can be breached."
-What we are seeing now is a convergence of the two with NAS heads built upon SAN backbones, enabling enterprises to service all areas of the business with appropriate technology," says Elisha. (See the sidebar -NAS-SAN Convergence".)
Whatever the network architecture, new standards for high-speed data transfer such as iSCSI and Serial ATA are essential to make real-time access to high-volume storage a reality.
Titterington believes the technology that we need most seriously is iSCSIâ€"Gigabit Ethernet is only the precursor. But both options may need further enhancement.
-iSCSI is still very immature," says Ray Morcos, systems engineer at SGI. -Serial ATA on its own is nothing special," says Bert Noah, enterprise solutions group director for Acer. -The development of interoperability for serial ATA will prove its success."
At the moment, the most reliable interconnect remains Fibre Channel. Its high speed has been matched by a high price, but that is changing. -The price gap between SCSI and Fibre Channel has almost disappeared," said Noah, predicting the two technologies will be equal in cost by year's end.
Yet arguments over technology shouldn't blind IT managers to the bigger question of business processes. -It doesn't matter how you connect into it. The big bang for buck comes when you can get a single way to backup," says Gold.
Next: Software is the key
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