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A hardware implementation of RAID requires at a minimum a special-purpose RAID controller. On a desktop system, this may be a PCI expansion card, or might be a capability built into the motherboard. In larger RAIDs, the controller and disks are usually housed in an external multi-bay enclosure.
The ZFS filesystem can likewise pool multiple devices of different sizes and implement RAID, though it is less flexible, requiring the creation of virtual devices of fixed size on each device before pooling. [11] In enterprise environments, enclosures are used to expand a server's data storage by using JBOD [12] devices. This is often a ...
A Dell PowerEdge RAID Controller, or Dell PERC, is a series of RAID, disk array controllers made by Dell for its PowerEdge server computers. [ 1 ] [ 2 ] The controllers support SAS and SATA hard disk drives (HDDs) and solid-state drives (SSDs).
Factory-assembled Buffalo external hard drive in a disk enclosure. Multiple drives: RAID-enabled enclosures and iSCSI enclosures commonly hold multiple drives. High-end and server-oriented chassis are often built around 3.5-in drives in hot-swappable drive caddies. "5.25-inch" drive: (5.75 in × 8 in × 1.63 in = 146.1 mm × 203 mm × 41.4 mm)
A 15-drive 3.5-inch hybrid DPE variant is also available. Additional storage can be added using disk-array enclosures (DAEs), available in 2U 2.5-inch 25-drive, 3U 3.5-inch 15-drive and 3U 2.5-inch 80-drive configurations. [22] The first four drives in a Dell EMC Unity DPE are system drives that contain the Dell EMC Unity OE (Operating ...
RAID (/ r eɪ d /; redundant array of inexpensive disks or redundant array of independent disks) [1] [2] is a data storage virtualization technology that combines multiple physical data storage components into one or more logical units for the purposes of data redundancy, performance improvement, or both.
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Each VMAX system supports up to 10 storage bays for hard drives. Each storage bay contains 16 Disk Array Enclosures (DAE), and each enclosure contains 15-25 hard drives. VMAX supports SATA, Fiber Channel, SAS and Solid State drives.