Foxconn A55M Manuel d'utilisateur télécharger pdf (Page 78)

RAID 0 (Striped)

RAID 0 reads and writes sectors of data interleaved among multiple drives. If any disk

member fails, it affects the entire array. The disk array data capacity is equal to the

number of drive members times the capacity of the smallest member. RAID 0 does

not support fault tolerance.

RAID 1 (Mirror)

RAID 1 writes duplicate data onto a pair of drives and reads both sets of data in

parallel. If one of the mirrored drives suffers a mechanical failure or does not respond,

the remaining drive will continue to function. Due to redundancy, the drive capacity of

the array is the capacity of the smallest drive.

RAID 10 (Striped Mirror)

RAID 10 is a combination of striping and mirroring. This conguration provides optimal

speed and reliability, but you need four SATA hard disks.

Span (JBOD)

JBOD stands for “Just a Bunch of Disks”. Each drive is accessed as if it were on a

standard SCSI host bus adapter. This is useful when a single drive conguration is

needed, but it offers no speed improvement or fault tolerance. A spanned volume is a

formatted partition which data is stored on more than one hard disk, yet appears as

one volume. Unlike RAID, spanned volumes have no fault-tolerance, so if any disk

fails, the data on the whole volume could be lost. Additionally, the system or boot

partitions cannot be included in a spanned volume. FAT16/32 and NTFS le systems

may be used, and the volume can span up to 32 hard disks.

Comparison Table :

Solution Hard Disks No. Capacity Performance Reliability Application

RAID0 >=2 All Highest Dangerous Look for speed

RAID1 2 50% Read faster Excellent 100% Data backup

RAID10 >=4 (Even number) Smallest*2 High Excellent Unlimited budget

Span >=1 All none Dangerous Big disk space

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Foxconn A55M Manuel d'utilisateur Page 78