Foxconn M61PMV English Manual. - Page 75

RAID 0 Striping, RAID 1 Mirroring, RAID 0+1 Stripe Mirroring, Spanning JBOD

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RAID 0 (Striping) 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 (Mirroring) 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 5 (Parity) RAID 5 provides data striping at the byte level and also stripes error correction information. This results in excellent performance and good fault tolerance. Level 5 is one of the most popular implementations of RAID. 5 RAID 0+1 (Stripe Mirroring) RAID 10 is a combination of striping and mirroring. This configuration provides optimal speed and reliability, but you need four SATA hard disks. Spanning (JBOD) JBOD stands for "Just a Bunch of Disks". Each drive is accessed as if it was on a standard SCSI host bus adapter. This is useful when a single drive configuration 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 file systems may be used, and the volume can span up to 32 hard disks. Comparison Table : Solution RAID0 RAID1 RAID5 Hard Disks No. >=2 2 >=3 RAID0+1 Span >=4 (Even number) >=1 Capacity All 50% N-1 Smallest *2 All Performance Highest Read faster Read faster Write slower High Reliability Dangerous Excellent Good Application Look for speed 100% Data backup Limited budget Excellent Unlimited budget none Dangerous Big disk space 68

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RAID 0 (Striping)
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 (Mirroring)
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 5 (Parity)
RAID 5 provides data striping at the byte level and also stripes error correction
information. This results in excellent performance and good fault tolerance. Level 5 is
one of the most popular implementations of RAID.
RAID 0+1 (Stripe Mirroring)
RAID 10 is a combination of striping and mirroring. This configuration provides optimal
speed and reliability, but you need four SATA hard disks.
Spanning (JBOD)
JBOD stands for “Just a Bunch of Disks”. Each drive is accessed as if it was on a
standard SCSI host bus adapter. This is useful when a single drive configuration 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 file 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
RAID5
>=3
N-1
Read faster
Write slower
Good
Limited budget
RAID0+1
>=4
(Even number)
Smallest
*2
High
Excellent
Unlimited budget
Span
>=1
All
none
Dangerous
Big disk space