USB and eSATA to SATA II RAID Subsystem
User Manual
17
Definition of RAID Levels
RAID 0
is typically defined as a group of striped disk drives without parity or data
redundancy. RAID 0 arrays can be configured with large stripes for multi-user
environments or small stripes for single-user systems that access long sequential records.
RAID 0 arrays deliver the best data storage efficiency and performance of any array type.
The disadvantage is that if one drive in a RAID 0 array fails, the entire array fails.
RAID 1
, also known as disk mirroring, is simply a pair of disk drives that store duplicate
data but appear to the computer as a single drive. Although striping is not used within a
single mirrored drive pair, multiple RAID 1 arrays can be striped together to create a
single large array consisting of pairs of mirrored drives. All writes must go to both drives
of a mirrored pair so that the information on the drives is kept identical. However, each
individual drive can perform simultaneous, independent read operations. Mirroring thus
doubles the read performance of a single non-mirrored drive and while the write
performance is unchanged. RAID 1 delivers the best performance of any redundant array
type. In addition, there is less performance degradation during drive failure than in RAID 5
arrays.
Содержание XL-RAID-2123ISSA
Страница 1: ...XL RAID 2123ISSA iSCSI USB and eSATA to SATA II RAID Subsystem User Manual ...
Страница 34: ...USB and eSATA to SATA II RAID Subsystem User Manual 34 ...
Страница 35: ...USB and eSATA to SATA II RAID Subsystem User Manual 35 ...
Страница 36: ...USB and eSATA to SATA II RAID Subsystem User Manual 36 ...
Страница 37: ...USB and eSATA to SATA II RAID Subsystem User Manual 37 ...