原帖由 綠袖子 於 2009-10-6 04:42 發表 
咁就順便問埋咩係backup既定義啦。
backup - 備用;備用物, 備用的, 【電腦】備份
如果係在單一硬碟發生問題時提供一個備份資料，RAID亦都係backup的一種方法。(RAID 0除外)
所以你呢個回覆根本就係廢up。
如果只係擺個英文字典嘅釋義出嚟就解釋到IT上嘅專用術語, 我估計所有大學可以將IT相關科目全部刪除啦.
依家係咪真係好興選擇性失明/失聰呢? 我提出3條問題, 你只選答1條(仲要答錯! ), 咁就話人廢噏, 真係唔知乜嘢叫做"廢"!
你喜歡quote定義, 我又quote番d俾你睇:
1. Backup is a copy of a file, directory or volume on a storage device created for the purpose of recovery in case the original data are accidentally erased, damaged, or destroyed.
(from: http://www.acronis.com/)
2. Definition: Data Backup is the physical copying of data files to a removable storage device that allows the data to be stored in another location. When needed, an individual data file or an entire set of data files, can be restored to a computer system.
(from: http://operationstech.about.com/)
3. In information technology, a backup or the process of backing up refer to making copies of data so that these additional copies may be used to restore the original after a data loss event. These additional copies are typically called "backups." The verb is back up in two words, whereas the noun is backup (often used like an adjective in compound nouns).
Backups are useful primarily for two purposes. The first is to restore a state following a disaster (called disaster recovery). The second is to restore small numbers of files after they have been accidentally deleted or corrupted.
Due to a considerable overlap in technology, backups and backup systems are frequently confused with archives and fault-tolerant systems. Backups differ from archives in the sense that archives are the primary copy of data, usually put away for future use, while backups are a secondary copy of data, kept on hand to replace the original item. Backup systems differ from fault-tolerant systems in the sense that backup systems assume that a fault will cause a data loss event and fault-tolerant systems assume a fault will not.
(from: http://en.wikipedia.org/)
4. Backup data: Duplicate (redundant) copy of data saved during a backup session, and available as replacement of damaged or lost primary data.
(from: http://www.businessdictionary.com/)
5. Duplicate copies of data on different storage media or additional hardware resources ready to take over if the main system fails. "Backup" (one word) is the noun, whereas "back up" (two words) is the verb. See backup types, backup file, backup & recovery, disaster recovery, fault tolerant and LAN free backup.
(from: http://dictionary.zdnet.com/)
仲有好多相關definition, 不勝枚舉... 
請問, raid符合以上定義?
如果你refer番去3) wiki嘅定義, 其實都有提到一般人會對於backup/archives/fault-tolerant system混淆, 而raid其實只係fault-tolerant system嘅一種.
最後我只係想講, raid本身獨立嚟睇並唔可以算係backup. 不過, 正如你另外提出, 亦未有完善嘅backup solution可以protect埋一d即時嘅data(無論個backup frequency幾頻密, 都會有漏洞, 係呢方面就需要raid作為一個complementary solution!
anyway, just a kind reminder... 大家只係討論, 可以客氣一d... |
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發表於 2009-10-5 10:51
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)叫做hot backup
