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NAS consolidation options

By: Ray Lucchesi

Issue date: Dec 2005

There are four main ways to consolidate NAS. The approach you take

depends on your storage environment, as well as your management and

performance requirements.

There's an old but regrettably true saw: The first NAS box installs without a

hitch, but the more filers you install the more your problems grow.

Consolidating NAS brings huge benefits to your storage environment:

reduced management activity, improved performance, increased storage

capacity and it frees data center floor space.

There are four basic ways to consolidate NAS data:

• The traditional approach, where you buy bigger and better versions

of the NAS gateways and/or integrated NAS filers you already own.

• Clustered file systems, which provide high-performance access to

file- system data for companies with large compute clusters.

• Parallel file systems, similar to clustered file systems, provide

concurrent access to a single file across a number of nodes

operating in parallel.

• NAS aggregators that can be used to consolidate data across a

number of distinct NAS filers (both gateways and integrated NAS).

EMC Corp., Network Appliance (NetApp) Inc. and others continue to

introduce faster and bigger high-end filers for their enterprise customers. In

some cases, these boxes hold more than 100TB of NAS data and support

multiprotocol access (CIFS, NFS, FTP, etc.). These products provide all of

the enterprise-class functionality you've come to expect, such as backup,

mirroring, replication and clustering support for high availability.

Traditional NAS boxes come in two flavors: gateways and integrated

boxes. A NAS gateway has a front-end file server with external back-end

storage attached via Fibre Channel (FC). An integrated NAS box has a

front-end file server and back-end storage integrated and purchased

together in one subsystem. There are a limited number of back-end

storage options for an integrated NAS box. A NAS gateway can potentially

support storage from many vendors.

Non-traditional approaches for NAS consolidation include clustered file

systems, parallel file systems and NAS aggregators. A clustered file

system supports file systems across a cluster of servers. Parallel file

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