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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 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.
The amount of usable storage can be approximated by summing the capacities of the disks and subtracting the capacity of the largest disk. For example, if a 500, 400, 200, and 100 GB drive were installed, the approximate usable capacity would be 500 + 400 + 200 + 100 − 500 = 700 GB of usable space.
MD can handle devices of different lengths, the extra space on the larger device is then not striped. RAID 1 – Mirror. RAID 4 – Like RAID 0, but with an extra device for the parity. RAID 5 – Like RAID 4, but with the parity distributed across all devices. RAID 6 – Like RAID 5, but with two parity segments per stripe.
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.
Standard RAID levels#RAID 6; Retrieved from "https: ... Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
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a mixture of disk drives configured as RAID 1 (2D+2D and 4D+4D) and RAID 5 (3D+1P and 7D+1P). from 5 drives to 128 for up to 36 TB of usable storage capacity, 4 drives at a time; heterogeneous connectivity via Fibre Channel, iSCSI, FICON and ESCON; all the software functionality of the larger XP 1024 with a smaller footprint.