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Promise Technology ATA RAID controller. A simple disk array controller may fit inside a computer, either as a PCI/PCIe expansion card or just built onto a motherboard. Such a controller usually provides host bus adapter (HBA) functionality itself to save physical space. Hence it is sometimes called a RAID adapter.
Diagram of a RAID 1 setup. RAID 1 consists of an exact copy (or mirror) of a set of data on two or more disks; a classic RAID 1 mirrored pair contains two disks.This configuration offers no parity, striping, or spanning of disk space across multiple disks, since the data is mirrored on all disks belonging to the array, and the array can only be as big as the smallest member disk.
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.
RAID 01, also called RAID 0+1, is a RAID level using a mirror of stripes, achieving both replication and sharing of data between disks. [3] The usable capacity of a RAID 01 array is the same as in a RAID 1 array made of the same drives, in which one half of the drives is used to mirror the other half.
RAID-1 RAID-1+0 RAID-5 RAID-6. Max RAID groups: 50 Max RAID groups: 75 Max RAID groups: 100 Availability: Nondisruptive replacement of major FRU components. Nondisruptive hot-pluggable disks Nondisruptive microcode updates Hi-Track Remote Monitoring system Performance: Controller cache: 4 GB–8 GB (per system) Controller cache: 8 GB–16 GB ...
RAID 1 layout. In data storage, disk mirroring is the replication of logical disk volumes onto separate physical hard disks in real time to ensure continuous availability. It is most commonly used in RAID 1. A mirrored volume is a complete logical representation of separate volume copies.
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).
A typical case where a RAID enters degraded mode is a simple two-drive mirror after a power failure – it is unlikely the drives are in sync. Every time blocks are written to the storage elements (physical drives, in this case), certain accounting information is updated after the write. The RAID controller will notice that the storage elements ...