Dell Precision T7400 User's Guide - Page 41
RAID Level 1, When data is written to the primary drive, the data is then duplicated-or
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NOTICE: Because RAID level 0 provides no data redundancy, if one drive fails, then the data on the other drive is also inaccessible. Therefore, ensure that you perform regular backups when you use a RAID level 0 configuration. RAID Level 1 RAID level 1 uses a data-redundancy storage technique known as "mirroring." When data is written to the primary drive, the data is then duplicated-or mirrored-on the other drive. A RAID level 1 configuration sacrifices highdata access rates for its data redundancy advantages. SATA RAID configured for RAID level 1 segment 1 segment 2 segment 3 segment 4 segment 5 segment 6 hard drive 1 segment 1 duplicated segment 2 duplicated segment 3 duplicated segment 4 duplicated segment 5 duplicated segment 6 duplicated hard drive 2 If a drive failure occurs, subsequent read and write operations are directed to the surviving drive. A replacement drive can then be rebuilt using the data from the surviving drive. Also, because data is duplicated on both drives, two 120-GB RAID level 1 drives collectively have a maximum of 120-GB on which to store data. RAID Level 5 NOTE: RAID levels 5 and 10 are only available via an optional PCI Express RAID controller card. Advanced Features 41