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February 2011

Idea lab

Network attached storage in a virtualised environment In a virtualised environment, network attached storage appliances can serve as a swap space to move virtual machines between servers, act as a backup medium, or play the role of central repository for all virtual disk images. NAS versus SAN for data center virtualisation storage There are two major approaches to network storage: network attached storage (NAS) and storage area network (SAN). They vary in both network architecture and how each presents itself to the network client. NAS devices leverage the existing IP network and deliver file-layer access. NAS appliances are optimised for sharing files across the network because they are nearly identical to a file server. SAN technologies, including Fibre Channel (FC) and iSCSI, deliver block-layer access, forgoing the file system abstractions and appearing to the client as essentially an unformatted hard disk. FC operates on a dedicated network, requiring its own FC switch and host bus adapters in each server. An emerging ...

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Features in this issue

  • Idea lab

    Where evolving network concepts come together.

News in this issue

  • Data centre management: The battle for control

    by  Nick Booth

    If data centre networks are becoming more important, why are networking pros losing their say in the battle for data centre management?

  • UK data protection regulations get stricter

    by  Tracey Caldwell

    As UK data protection regulations and data privacy laws and their enforcement becomes tougher, enterprises must learn the intricacies of the Data Protection Act and the E-Privacy Directive, among other laws that affect network security.

  • UK heads for a mobile network operator duopoly

    by  Bryan Betts

    UK mobile network operators are dwindling due to mergers and agreements that stifle competition. Businesses must consider the effect this network consolidation will have on mobile services available to them and the prices they will have to pay.