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Confusion keeps Sans on the shelf

They promise lots, but few have adopted storage area networks. Nicholas Enticknap finds out why

Storage area networks (Sans) arrived in the mid-1990s when increasing statistics volumes meant that the copper cabling and SCSI interfaces used to attach storage subsystems to servers were beginning to creak under the strain. however Sans have taken off much greater slowly than anybody anticipated.

committed storage networks became vital when an explosive increase in records storage requirements turned into caused with the aid of the emergence of the business web. This created a necessity for superior scalability than server-attached storage may deliver.

This led, to a becoming hobby in shared storage programs - subsystems that can be shared between heterogeneous servers - which turned into finished through allocating specified proportions of the subsystem to the different servers, a technique referred to as physical partitioning.

however, it was tricky to modify partition sizes in line with changes in workload. These programs additionally had many of the dangers of dedicated server storage, basically constrained scalability and the should use server processing power for many features.

The subsequent logical step changed into to separate the storage from the server completely and turn it into a committed community, simply as workstation management turned into offloaded from the server to the local area community within the Eighties. This opened the opportunity for can charge discounts and simpler storage management via consolidating storage attached to diverse servers.

Fibre Channel Sans offer impressive performance because the requirements they're developed on were designed for the job. In contrast, both important networking protocol units in average use, TCP/IP and techniques network architecture (SNA), have been designed to aid all types of computing transmission.

The disadvantage of Fibre Channel is that it requires clients to build an entire new networking infrastructure. this is each costly and time-consuming.

StandardsAnother difficulty is that the requisites are nonetheless being developed. This capacity it isn't yet viable to purchase a group of San hardware and application add-ons from different suppliers, plug them collectively and expect them to work, as is the case when constructing a Lan. specialist expertise is required.

These hazards have inhibited the take-up of Sans. Few have built enterprise-broad Sans and people that do exist had been built for tightly-described functions, typically for again-up.

expanding statistics volumes imply that again-up traffic regularly saturates the Lan. the usage of Sans to eliminate returned-up from each the Lan and the server can offer enough benefits to justify the charge.

Robin Pilcher, Tivoli Storage administration's advertising manager, defined, "Over 50% of the site visitors on the Lan is only housekeeping activities. And it is the server doing that - on an NT desktop the usage of as much as 50% of its cycles."

IP networkPeople are starting to question whether Fibre Channel is the appropriate infrastructure for all storage purposes. there is increasing interest in building Sans the use of latest Ethernet/IP community expertise, as used in ninety% of Lans around the globe.

"IP networks are getting quicker and might birth to have efficiency similar to a Fibre Channel San," spoke of Jill Kaplan, IBM storage solutions' product manager.

The information superhighway Engineering task drive is working on a standard referred to as iSCSI, which defines the interfaces for connecting storage instruments to an IP community.

IBM and Cisco are the riding forces behind this initiative and IBM grew to be the first company to introduce an iSCSI-enabled storage machine, the IP Storage 200i, in February.

a few days later, element agency Adaptec delivered iSCSI-based interface cards and controllers to enable storage suppliers and integrators to strengthen their own iSCSI items.

The Storage Networking business affiliation (SNIA) has introduced momentum to this development through forming its first advertising community, the SNIA IP Storage forum, to advertise the technology.

Some agencies are additionally investigating running IP over Fibre Channel. "If a client wishes to make use of a San only for storage consolidation and not trade any hardware or application, mapping IP back-up traffic on to Fibre Channel in its place of the Lan, this reduces elapsed time and protects all the investment in hardware and application," stated Hitachi's Tony Reid.

Fibre Channel IP back-united statesare 50% faster than Lan IP again-americabut require the use of Fibre Channel host bus adapters in every server. These are only coming onto the market from organizations similar to Emulex.

The iSCSI trend represents a method of making an attempt to take the trouble out of enforcing Sans. an extra formula is to make use of a prepackaged bundle during which all the component elements are tested to make sure they work together. a few suppliers have installation dedicated interoperability labs to do such checking out work.

Off-the-shelf SansHewlett-Packard and IBM have gone a step further and announced a number of off-the-shelf offerings in February. each are built across the company's own hardware and software storage products and supplemented by way of textile devices from partners.

this is a good way of getting up and running instantly, but limits the person's expansion abilities to items included within the bundle. An offering incorporating a Brocade change, for instance, can simplest be multiplied by adding other Brocade switches.

other organizations, together with Gadzoox and Storage expertise, wish to simplify San implementation with the aid of virtualisation concepts.

Gadzoox introduced the Axxess package closing October. Axxess is designed to make constructing Sans more straightforward by means of "virtualising" the storage, that's, turning physical storage gadgets into logical contraptions. In concept, this allows any classification of physical gadget to be attached to the San.

Gadzoox is a swap organisation so it has constructed its strategy round adding intelligence to the swap - Axxess is just about a unique-intention server that serves this function.

Tape drive service provider Storage expertise is moving in the same route but from a special starting aspect. It launched the Storagenet 6000 ultimate October as a server that runs a number specialised utility. A key piece of application is digital Transport manager, which allows for sharing of tape drives throughout all Unix and NT hosts and across distinctive lower back-up purposes.

"This allows purchasers to accommodate migration to new applied sciences without disrupting servers. They decouple the administration of storage from the administration of servers so you get greater effective administration of storage," explained Storage technology's community line-of-business manager Mike Harper.

San managementSan management application is still in its infancy but there are trends here, too.

IBM subsidiary Tivoli has reoriented its building strategy from methods management to storage administration. Its flagship offering is Tivoli Storage community supervisor, a San administration product with policy-based mostly automation and potential-on-demand capabilities.

still to return from Tivoli is Storage Tank, which aims to give hierarchical storage management facilities to the San world.

"The quantity of storage a gadget administrator can manipulate within the mainframe world is usually 7Tbytes. within the open techniques world, it is 250-500Gbytes, depending on even if it's centralised or distributed. it really is on account of the guide administration fundamental - so we're basically providing that 7Tbytes potential," stated Pilcher.

Hewlett-Packard, has followed suit, introducing Openview San supervisor, a software suite that includes some prior to now developed single-feature products with new purposes to create an entire providing.

Veritas has also been pioneering with its Sanpoint control application, a product set incorporating virtualisation strategies. Sanpoint helps a large choice of cloth and storage instruments however, until March this yr, solar Solaris changed into the best platform supported. The business has now released version 2.0, which provides aid for home windows NT and 2000 structures.

regardless of all these initiatives aimed at overcoming the limitations of Sans - or possibly as a result of them - the ambiance is not reasonably there yet referred to Pilcher.

"a lot of companies are sitting on the fence. here is as a result of they are perplexed via the large amount of differing messages on Sans," he said.

So it is going to probably be a while yet earlier than networked storage becomes the norm in IT departments.

elements slowing San adoption

  • Fibre Channel requires costly new community infrastructure
  • Lack of regular standards limits plug-and-play-storage
  • San administration utility is in its infancy.

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