Adaptec SAS RAID Controllers Instalační příručka stáhnout pdf (Strana 106)

92 Sun StorageTek SAS RAID HBA Installation Guide • March 2010

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.

Nonredundant Arrays (RAID 0)

An array with RAID 0 includes two or more disk drives and provides data striping,

where data is distributed evenly across the disk drives in equal-sized sections.

However, RAID 0 arrays do not maintain redundant data, so they offer no data

protection.

Compared to an equal-sized group of independent disks, a RAID 0 array provides

improved I/O performance.

Drive segment size is limited to the size of the smallest disk drive in the array. For

instance, a array with two 250 GB disk drives and two 400 GB disk drives can create

a RAID 0 drive segment of 250 GB, for a total of 1000 GB for the volume, as shown in

this figure.

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Adaptec SAS RAID Controllers Instalační příručka Strana 106