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preferred owner
In a dual controller enclosure, the controller to which an array is originally
assigned. If the preferred owner fails (due to a hardware problem, for example),
the array automatically moves to the other controller (fail over). The ServeRAID
Manager allows you to restore the array to its preferred owner with fail back.
Intentionally moving an array to different controller in the enclosure changes its
preferred owner.
Q
quorum drive
In the Microsoft Clustering Solution, a logical drive that stores the quorum
resource information.
R
restore to factory-default settings
An action that restores all parameters in the controller to the factory-default
settings. If logical drives are defined, the data stored on them will be lost.
rack enclosure
See enclosure.
RAID
A technology of grouping several physical drives in a computer into an array that
you can define as one or more logical drives. Each logical drive appears to the
operating system as a single drive. This grouping technique greatly enhances
logical-drive capacity and performance beyond the physical limitations of a single
physical drive.
RAID level-0
A RAID level that uses data striping to distribute data evenly across physical
drives. While it enables full utilization of physical drive capacity and performance
acceleration, RAID level- 0 provides neither fault tolerance nor redundancy.
RAID level-1
A RAID level that uses data mirroring to distribute data across two physical
drives. It provides data redundancy and performance acceleration, although the
usable physical drive space is reduced by 50 percent.
RAID level-1E
A RAID level that uses both data striping and data mirroring to distribute data
across three or more physical drives. Data is striped across each disk in the array;
the first set of stripes are the data stripes, and the second sets of stripes are mirror
copies of the first stripe, shifted one drive. It provides data redundancy and
performance acceleration, although the usable physical drive space is reduced by
50 percent.
268 ServeRAID Manager Installation and User's Guide