![]() The drives of the latter are combined into a single logical unit using the spanning, striping or mirroring technique. The devices are available in both singe-drive (My Cloud Home) and dual-drive options (My Cloud Home Duo). WD My Cloud Home is a line of consumer NAS products designed by Western Digital. RAID sets are not created over the whole disks but over the regions on them of several tens of megabytes, which are then combined in zones, from which the allocation of file system clusters is carried out. BeyondRAID employs a combination of RAID 1 and RAID 5 to achieve single redundancy and a combination of parity and diagonal parity for double redundancy, while the protection algorithm is chosen by BeyondRAID itself on the basis of data availability needs at the given moment. To combine multiple physical disks into single storage and ensure data safety, Drobo utilizes a proprietary RAID-based technology called BeyondRAID. A home-oriented Drobo NAS box applies ext3 and is presented to the operating system as network storage with a single volume, in contrast to professional models, which usually give the possibility to split up the storage into several volumes or Logical Unit Numbers (LUNs). Drobo DAS is normally recognized by the host PC as an ordinary USB drive and is managed by the file system defined by the host computer. ![]() A Drobo unit can feature from 4 up to 12 drive bays, in which drives of different capacities, types and spindle speeds can be inserted. Unlike standard logical volumes, which reserve storage blocks upon creation, blocks in thin volumes are allocated as they are written.ĭrobo is a series of multi-disk NAS and DAS devices developed by Drobo Inc. Each thin provisioned logical volume is bound to a storage pool of free space referred to as a thin pool and is given a virtual size which can be as large as the whole pool itself. Thin Provisioning serves for cost-efficient allocation of storage space, allowing administrators to assign logical volumes more storage capacity than actually exists in the system. LVM offers a wide variety of advanced features, among which are striping, mirroring, snapshots and Thin Provisioning. Utilizing the device mapper framework, LVM combines existing storage devices into logical groups, which act as pools of storage space used to dynamically allocate logical units as needed. ![]() LVM stands for Logical Volume Manager and is a Linux storage management technology which provides more administration flexibility in comparison to the traditional method of disk partitioning.
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