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2TB
2TB
2TB
2TB
8TB
EMPTY
XOR PARITÄT
2TB
2TB
2TB
4TB
2TB
2TB
2TB
XOR PARITÄT
2TB
6TB
2TB
2TB
EMPTY
EMPTY
MIRRORING
2TB
8TB
2TB
2TB
2TB
2TB
2TB
2TB
2TB
2TB
4TB
EN - 07/28 EN - 08/28
Spanning
RAID O
RAID O
Striping
Mirroring
RAID 1
RAID 3
Striped set
with dedicated parity
RAID 5
Striped set
with distributed parity
RAID 10
Mirroring +
Striping
Spanning concatenates multiple hard drives as a single large volume; resulting in a seamless
expansion of virtual volumes beyond the physical limitations of separately connected
hard drives. Thze data are written frim HDD1 to HDD4.
Striping is a method of concatenating multiple hard drives into one logical storage unit.
It is the automated process of writing data across multiple drives simultaneously.
Striping is used to increase the performance of disk reads. The multiple hard drives will
write data in “column” e
ffect. If one drive in a striped set fails, all of the data in the stripe
set is lost.
Mirroring is the automated process of writing data to multiple drives simultaneously.
Mirroring is used to provide redundancy. If one drive fails, the redundant drive(s) will
continue to store the data and provide access to it. The failed drive can then be
replaced and the drive set can be rebuild.
This mechanism provides an improved performance and fault tolerance similar to
RAID 5 but with a dedicated parity disk rather than rotated
parity stripes.
The single parity disk is a bottle-neck for writing since every write requires updating the
parity data. One minor benefit is the dedicated parity disk allows the parity drive to
fail and operation will continue without parity or performance penalty.
Distributed parity requires all drives but one to be present to operate; drive failure
requires replacement, but the array is not destroyed by a single drive failure.
Upon drive failure, any subsequent reads can be calculated from the distribute
d parity
such that the drive failure is masked from the end user. The array will have data
loss in the event of a second drive failure and is vulnerable until the data that was
on the failed drive is rebuilt onto a replacement drive.
RAID 10 is mirrored(Raid 1) sets in a striped(Raid 0) set .
RAID 1 Set
RAID 0 Set
RAID 0 Set
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