Dell Precision T7400 (Late 2007) - Manual (Page 43)

Advanced Features 43
RAID Level 10
NOTE: RAID levels 5 and 10 are only available via an optional PCI Express RAID
controller card.
RAID level 10 uses a combination of striping and mirroring methods. It
requires four drives. The drives are broken up into mirroring pairs and then
the data that is written to the RAID configuration is striped across all four
drives. Data can be accessed quickly, due to the striping of data, however each
piece of data is duplicated on another drive, for redundancy purposes.
If a drive failure occurs, subsequent read and write operations are directed to
the other surviving drives. A replacement drive can then be rebuilt using the
data from the surviving drives. Also, because data is duplicated on the primary
and additional drives, four 120-GB RAID level 1 drives collectively have a
maximum of 240-GB on which to store data.
hard drive 1
segment 1
segment 2
segment 3
hard drives 2, 3, and 4
segment 4
segment 5
segment 6
segment 1 striped across 4 drives
segment 2 striped across 4 drives
segment 3 striped across 4 drives
segment 4 striped across 4 drives
segment 5 striped across 4 drives
segment 6 striped across 4 drives
SATA RAID
configured for
RAID level 10