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Introductie Windows Server 2016

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74 C H A P T E R 3 | Storage Storage Spaces Storage Spaces provides storage pools and virtual drives. The storage pool can span all of the local storage across the nodes. The virtual drives provide resiliency to drive or node failures because data copies are stored on different storage nodes. ReFS Resilient File System (ReFS) provides the file system in which the Hyper-V VM files are stored. ReFS is a premier file system in Windows Server 2016 Technical Preview for virtualized deployments and includes optimizations for Storage Spaces such as error detection and automatic correction. In addition, ReFS provides accelerations for VHD(X) operations such as fixed VHD(X) creation, dynamic VHD(X) growth, and VHD(X) merge. CSVFS layers above ReFS bring all the mounted volumes into a single namespace. Scale-Out File Server This is the top layer of the storage stack that provides remote access to the storage system by using the SMB 3.0 access protocol. Improved scalability You can deploy Storage Spaces Direct using storage nodes with either local storage or nonshared JBODs. In previous versions of Windows Server, scaling out Storage Spaces solutions required a concurrent increase in the scale of the SAS fabric that joined the storage nodes to the shared SAS JBODs. In contrast, with Storage Spaces Direct, you can set up a model that removes the complexities of the SAS fabric, making scale-out as simple as adding a new storage node, either with internal storage or attached to a nonshared JBOD. Scaling out by adding storage nodes provides more flexibility in storage planning because storage expansion is no longer bound by the number of drive slots in a shared SAS JBOD. To support this model of just-in-time scale-out, Storage Spaces Direct improves scalability compared to previous versions of Windows Server because you can now manage more drive devices in a single storage pool. Increasing the number of drive devices in a single pool reduces the number of storage pools that you must create, simplifying management of the storage solution. Storage Spaces optimized pool Storage Spaces Direct can optimize a storage pool to balance data equally across the set of physical drives that comprise the pool. Over time, as physical drives are added or removed or as data is written or deleted, the distribution of data among the set of physical drives that comprise the pool can become uneven. In some cases, this might result in certain physical drives becoming full, whereas other drives in the same pool have much lower consumption. Similarly, if you add new storage to the pool, optimizing the existing data to utilize the new storage results in better storage efficiency across the pool and, potentially, improved performance from the newly available additional physical storage throughput. Optimizing the pool is a maintenance task that the administrator performs. When the optimize pool command is started, Storage Spaces Direct moves data among the physical drives in the pool. The data movement is a background operation, designed to minimize impact to foreground or tenant workloads. Failure scenarios Storage Spaces Direct addresses various failure scenarios. To understand how this works, you first need to review some basic information about virtual drives. A virtual drive consists of extents, each of which is 1 GB in size. A 100-GB virtual drive will therefore consist of 100 1-GB extents. If the virtual drive is mirrored (using ResiliencySettingName), there are multiple copies of the extent. The number of copies of the extent (obtained by using NumberOfDataCopies) can be two or three. For example, a mirrored virtual drive with three data

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