Software Raid
RAID level
RAID stands for Redundant Array of Independent Drives. It comes in different levels:
RAID0
Data spread across two disks. Zero fault intolerance. 100% storage capacity.
RAID1
Data mirrored across two disks. Allow 1 disk failure. 50% storage capacity.
RAID5
Data chopped into 2 pieces, and a calculated checksum forming the 3rd piece. 3 pieces of data are then spread across multiple disks. n-1 storage capacity, minimum 3 disks.
RAID0+1
1 set of mirror consists of 2 sets of stripe. Allow 1 disk failure, 50% storage capacity.
RAID1+0 (or RAID10)
1 set of stripe consists of 2 sets of mirror. Allow 2 disk failure, 50% storage capacity.
RAID5+0
1 set of stripe consists of 2 sets of RAID5.
RAID5+1
1 set of mirror consists of 2 sets of RAID5
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