Adaptec 48300 - Manual (Page 90)

Understanding RAID ●
90
Understanding Drive Segments
A drive segment is a disk drive or portion of a disk drive that is used to
create an array. A disk drive can include both RAID segments
(segments that are part of an array) and available segments. Each
segment can be part of only one logical device at a time. If a disk drive is
not part of any logical device, the entire disk is an available segment.
Selecting the Best RAID Level
A RAID (Redundant Array of Independent Disks) provides better
performance and reliability from combinations of drives than is
possible with the same total storage space without RAID.
When you create arrays (or logical drives), you can assign a RAID level
to protect your data. Each RAID level offers a unique combination of
performance and redundancy. RAID levels also vary by the number of
disk drives they support.
The following table shows the number of drives needed and supported
for the Adaptec SAS 48300 HostRAID controller according to RAID
level.
Note: Select RAID drives of equal capacity and performance.
Otherwise, the RAID tends to be limited in capacity and performance
to that of the smallest and slowest drive.
Array Type
Minimum
Drives Required
Maximum Drives
Supported
RAID 0 2 4
RAID 1 2 2
RAID 10 4 4