RAID (redundant array of independent disks, originally redundant array of inexpensive disks) is a storage technology that combines multiple disk drive components into a logical unit. Data is distributed across the drives in one of several ways called "RAID levels", depending on what level of redundancy and performance (via parallel communication) is required. In October 1986, the IBM S/38 announced "checksum". Checksum was an implementation of RAID-5. The implementation was in the operating system and was software only and had a minimum of 10% overhead. The S/38 "scatter loaded" all data for performance. The downside was the loss of any single disk required a total system restore for all disks. Under checksum, when a disk failed, the system halted and was then shutdown. Under maintenance, the bad disk was replaced and then a parity-bit disk recovery was run. The system was restarted using a recovery procedure similar to the one run after a power failure. While difficult, the recovery from a drive failure was much shorter and easier than without checksum.
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Some articles on raid:
... After this raid the Pope Alexander IV tried without success to organize a crusade against the Tatars ... An unsuccessful raid followed in 1287, led by Talabuga and Nogai Khan ... This raid consisted of less than one tumen, since the Golden Horde's armies were tied down in a new conflict which the Il-Khanate initiated in 1284 ...
... As the tide came back in, the Samarkanda refloated itself, none the worse for wear ... A prize crew from HMCS Qu'Appelle boarded and got engines started ...
... The Great Raid is a 2005 war film about the Raid at Cabanatuan, adapted from William Breuer's book of the same name ...
... The Raid on Pickawillany is a famous event in Ohio history, and one of the events that led to the French and Indian War ... The raid resulted in the deaths of at least one English trader and Old Briton ...
... Non-RAID drive architectures also exist, and are often referred to, similarly to RAID, by standard acronyms, several tongue-in-cheek ... Large Expensive Disk/Drive), by contrast with RAID, while an array of drives without any additional control (accessed simply as independent drives) is referred to, even in a formal context such as equipment ...
More definitions of "raid":
- (verb): Enter someone else's territory and take spoils.
Synonyms: foray into
- (verb): Search for something needed or desired.
Example: "Our babysitter raided our refrigerator"
- (noun): An attempt by speculators to defraud investors.
- (verb): Search without warning, make a sudden surprise attack on.
Famous quotes containing the word raid:
“John Brown and Giuseppe Garibaldi were contemporaries not solely in the matter of time; their endeavors as liberators link their names where other likeness is absent; and the peaks of their careers were reached almost simultaneously: the Harpers Ferry Raid occurred in 1859, the raid on Sicily in the following year. Both events, however differing in character, were equally quixotic.”
—John Cournos (18811956)
Is a new beginning, a raid on the inarticulate
With shabby equipment always deteriorating
In the general mess of imprecision of feeling.”
—T.S. (Thomas Stearns)