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Technology BackgroundPegasus32 Product Manual
RAID 1 – Mirror
When a logical drive is mirrored, identical data is written to a pair of physical drives, while reads are
performed in parallel. The reads are performed using elevator seek and load balancing techniques
wheretheworkloadisdistributedinthemostefcientmanner.Whicheverdriveisnotbusyandis
positionedclosertothedataisaccessedrst.
With RAID 1, if one physical drive fails or has errors, the other mirrored physical drive continues to
function. Moreover, if a spare physical drive is present, the spare drive is used as the replacement drive
and data begins to mirrored to it from the remaining good drive.
RAID 1 Mirrors idencal data to two drives
The logical drive’s data capacity equals the smaller physical drive. For example, a 100 GB physical
drive and a 120 GB physical drive have a combined capacity of 100 GB in a mirrored logical drive.
If physical drives of different capacities are used, there is unused capacity on the larger drive.
RAID 1 logical drives on Pegasus consist of two physical drives.
If you want a mirrored logical drive with more than two physical drives, see “RAID 1E – Enhanced
Mirror”.
Physical Drives
Data Mirror
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