Adaptec DuraStor 7220SS User Manual page 156

Adaptec Storage Manager Pro for DuraStor User's Guide
preferred controller
When a storage system is in an active-active mode, a single
controller has ownership of arrays and dedicated spares and is the
preferred owner. If the controller fails, the other controller assumes
temporary ownership of its resources. See also storage system.
R
RAID 0
See stripe set (RAID 0).
RAID 1
See mirror set (RAID 1).
RAID 0/1
See stripe set of mirror sets (RAID 0/1).
RAID 0/5
See stripe set of RAID 5 sets (RAID 0/5).
RAID 3 set
A RAID 3 set is an array made up of three or more disk drives. It
uses parallel access, meaning all member disk drives participate
concurrently in every I/O operation directed at the array. Each
virtual disk drive I/O operation is subdivided and distributed
(striped) across all data disk drives; therefore, it uses small stripe
depth. Parity check data is stored on a separate parity disk drive.
See also chunk; partition; parity.
RAID 4 set
A RAID 4 set is an array made up of three or more disk drives.
Data blocks are distributed as with RAID 0 (disk striping). It
differs from RAID 3 in two ways: 1) it normally uses independent
access (rather than parallel access), meaning the array's disk drives
may operate independently of each other allowing multiple
simultaneous read and write operations, and 2) stripe depth is
larger than the virtual disk drive average I/O size. Parity check
data is stored on a separate parity disk drive. See also chunk;
partition; parity.
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