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A VSAN operates as a dedicated piece of software responsible for storage access, and depending on the vendor, can run either as a virtual storage appliance (VSA), a storage controller that runs inside an isolated virtual machine (VM) [1] or as an ordinary user-mode application, such as StarWind Virtual SAN, or DataCore SANsymphony.
The core product families are vSphere, vSAN and NSX for on-premises virtualization. [1] VMware Cloud Foundation (VCF) is an infrastructure platform for hybrid cloud management. [ 1 ] The VMware Infrastructure suite is designed to span a large range of deployment types to provide maximum flexibility and scalability.
The storage software is often called a VSA−virtual SAN appliance [11] or virtual storage appliance. VSA products from companies such as HP, Nutanix and VMware allow users to build storage-area networks using their existing servers. [12] [13] [14] [15]
The file format of the virtual appliance is the concern of the cloud provider and usually not relevant to the cloud user even though the cloud user may be the owner of the virtual appliance. However, challenges may arise with the transfer of virtual appliance ownership or transfer of virtual appliances between cloud data centers.
A storage area network (SAN) or storage network is a computer network which provides access to consolidated, block-level data storage.SANs are primarily used to access data storage devices, such as disk arrays and tape libraries from servers so that the devices appear to the operating system as direct-attached storage.
StarWind Software, Inc. is a privately held Beverly, Massachusetts-based [1] computer software and hardware appliance company specializing in storage virtualization and software-defined storage. History
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VMFS-L is the underlying file system for VSAN-1.0. Leaf level VSAN objects reside directly on VMFS-L volumes that are composed from server side direct attached storage (DAS). File system format is optimized for DAS. Optimizations include aggressive caching with for the DAS use case, a stripped lock down lock manager and faster formats.