Foxconn Rattler User manual - Page 69

RAID 0 Stripe, RAID 1 Mirror, RAID 5 Parity, RAID 10 0+1, Comparison Table

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5 RAID 0 (Stripe) 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. The striping block size can be set from 4KB to 128KB. 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. Under a RAID 1 setup, an extra drive called the "spare drive" can be attached. Such a drive will be activated to replace a failed drive that is part of a mirrored array. Due to the fault tolerance, if any RAID 1 drive fails, data access will not be affected as long as there are other working drives in the array. 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 10 (0+1) RAID 10 is a combination of striping and mirroring. This configuration provides optimal speed and reliability, but you need four SATA hard disks. Recovery This level copies data between a master and a recovery disk, so the capacity of the array is equal to the capacity of the smaller drive. It's no need to set the strip size for Recovery, but you must select a sync mode to update the volume. Comparison Table : Solution RAID0 RAID1 RAID5 Hard Disks No. >=2 2 >=3 RAID10 >=4 (Even number) Recovery 2 Capacity All 50% N-1 Smallest *2 Smaller 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 Read faster Excellent 100% Data backup 62

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5
62
RAID 0 (Stripe)
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.
The striping
block size can be set from 4KB to 128KB. 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. Under a RAID 1 setup, an extra drive
called the “spare drive” can be attached. Such a drive will be activated to replace a
failed drive that is part of a mirrored array. Due to the fault tolerance, if any RAID 1
drive fails, data access will not be affected as long as there are other working drives in
the array.
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 10 (0+1)
RAID 10 is a combination of striping and mirroring. This configuration provides optimal
speed and reliability, but you need four SATA hard disks.
Recovery
This level copies data between a master and a recovery disk, so the capacity of the
array is equal to the capacity of the smaller drive. It’s no need to set the strip size for
Recovery, but you must select a sync mode to update the volume.
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
RAID10
>=4
(Even number)
Smallest
*2
High
Excellent
Unlimited budget
Recovery
2
Smaller
Read faster
Excellent
100% Data backup