{"id":16245,"date":"2022-12-07T10:28:24","date_gmt":"2022-12-07T09:28:24","guid":{"rendered":"https:\/\/www.databack.fr\/data-recovery-expert\/raid-system\/raid-1\/"},"modified":"2025-08-27T11:35:10","modified_gmt":"2025-08-27T09:35:10","slug":"raid-1","status":"publish","type":"page","link":"https:\/\/www.databack.fr\/en\/data-recovery-expert\/raid-system\/raid-1\/","title":{"rendered":"RAID 1"},"content":{"rendered":"\t\t
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\n\t\t\t\t\tRAID 1 data recovery<\/span>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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How RAID 1 works: mirroring<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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A RAID 1 system<\/strong> consists of a cluster of at least two hard disks, preferably of identical storage capacity. These disks operate with perfect redundancy, without parity blocks (unlike RAID 5)<\/a>, on a mirroring <\/em> principle: during write operations, data is duplicated and written simultaneously to each of the disks in the cluster, instead of being distributed in bands between them (as is the case with RAID 0, for example) .<\/a> <\/p>

Because of this storage principle, the capacity of RAID 1 is equivalent to the capacity of the smallest hard disk in the cluster. Any surplus storage space on higher-capacity disks will therefore remain unused. Mirroring<\/em> also has an impact on write speed, which is reduced to that of the slowest disk in the cluster. Reading speed, on the other hand, is improved by data redundancy and is virtually equivalent to that of the fastest disk. <\/p>

While the usable capacity of a RAID 1 system remains limited, its fault tolerance increases with the number of “mirror” disks it contains and the resulting data redundancy. RAID 1 therefore offers high availability and a high level of security for data protection. Total redundancy, however, comes at a high financial price, since system capacity does not increase with the number of disks. RAID 1 is therefore unsuitable for backing up large volumes of data. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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\n\t\t\t\t\tRecover RAID 1 data<\/span>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Data loss and recovery on RAID 1 systems<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Data recovery on a RAID 1 system<\/strong> is facilitated by the mirroring<\/em> principle and perfect redundancy of this configuration. Data replication on all the disks in the array guarantees backup in the event of failure. In the event of a failure or incident, the RAID 1 system continues to operate, ensuring permanent accessibility to data, as long as only one disk remains functional. <\/p>

If a disk malfunction does not affect RAID 1 operation, it is nevertheless necessary to shut down the system in order to repair it. The faulty disk can then be replaced, or even cloned and analyzed if necessary, in complete safety. Each hard disk in the <\/p>

cluster containing the complete data, a synchronization operation is required to upgrade the new disk and finalize the operation.<\/p>

A RAID 1 system can withstand the loss of N-1 hard disks (N being the total number of disks in the array). On a cluster made up of storage media from the same series and supporting the same frequency of use, the probability of them all failing simultaneously increases with time. This can also occur in the event of a disaster (flood, fire, lightning strike, etc.). <\/p>

The operations required to recover RAID 1 data (disk cloning, cleaning, synchronization, etc.) may then require the environment and expertise of a laboratory.<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tRequest a quote<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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RAID 1 data recovery How RAID 1 works: mirroring A RAID 1 system consists of a cluster of at least two hard disks, preferably of identical storage capacity. These disks operate with perfect redundancy, without parity blocks (unlike RAID 5), on a mirroring principle: during write operations, data is duplicated and written simultaneously to each […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":16219,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page_recuperation_support.php","meta":{"_yoast_wpseo_title":"RAID 1 data recovery - Databack Laboratoire Fran\u00e7ais","_yoast_wpseo_metadesc":"Databack, the data loss specialist, offers you its RAID 1 data recovery procedure.","footnotes":""},"class_list":["post-16245","page","type-page","status-publish","hentry"],"yoast_head":"\nRAID 1 data recovery - Databack Laboratoire Fran\u00e7ais<\/title>\n<meta name=\"description\" content=\"Databack, the data loss specialist, offers you its RAID 1 data recovery procedure.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.databack.fr\/en\/data-recovery-expert\/raid-system\/raid-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"RAID 1 data recovery - 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