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Summary:

Nasuni has closed a $15 million Series B round, bringing its total to $23 million over two rounds on the promise of its file system virtual appliance that automatically distributes files between the cloud and a local cache.

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Natick, Mass.-based, cloud-storage startup Nasuni has closed a $15 million Series B round, led by Flybridge Capital Partners with participation from existing investors North Bridge Venture Partners and Sigma Partners. The company has raised $23 million over two rounds on the promise of its file system virtual appliance that automatically distributes files between the cloud and a local cache. We covered it in February, when its Nasuni Filer software entered public beta, and since then, it entered general availability and has been adding support on a regular basis to expand beyond its initial VMware-only scope.

I noted in February that although VMware is the predominant hypervisor in corporate data centers, it’s fast losing ground to alternatives. To address this, Nasuni has expanded its coverage to both Microsoft Hyper-V and Citrix XenServer. Its Windows support actually goes beyond Hyper-V to include the ability to store files in Windows Azure and on-premise Windows Distributed File System namespaces. Aside from Windows environments, Nasuni also added support for Rackspace Files, Nirvanix, EMC Atmos-based platforms and private clouds, in general.

Nasuni’s virtual appliance form factor and file-system focus help distinguish it from other startups that have launched in the past several months, but the idea of a local appliance controlling data placement between local servers and the cloud is catching on. Cirtas and StorSimple, for example, sell physical appliances that send data to the cloud for backup but keep certain info local via built-in cache capacity. Both virtual and physical appliances have their benefits – virtual appliances are quickly downloadable and relatively inexpensive, whereas physical appliances offer better performance (StorSimple just added SSDs to its appliances).

Whatever, the approach, though, cloud storage startups are racking up funding. Nasuni’s $23 million total puts it a hair above scale-out storage provider Zetta at $22.5 million, but well below Nirvanix and its $45 million. Appliance comrades Cirtas and StorSimple have raised $10 million and $21 million, respectively, and clustered file system vendor Scale Computing just raised its total to $31 million.

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  2. [...] Presently, many customers use cloud-based storage services for backup or archiving, which are fine use cases but don’t necessarily provide the value of being able to do primary storage in the cloud. Recently, startups such as Cirtas Systems and Nasuni have targeted primary storage in the cloud, although they sell appliances (physical and virtual, respectively) that intelligently route data to cloud provider back ends or, for hot data, to on-premise caches. Cirtas, which aims to replace storage arrays for block storage, has announced $32.5 million in funding since it launched in September, while Nasuni, which focuses on file storage, has raised $23 million in just under a year. [...]

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  3. [...] time in November, the spending and funding has only picked up. SolidFire scored $11 million, Nasuni got $15 million, Scale Computing closed $17 million and Cirtas stole the show with $22.5 million. And don’t [...]

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