3.3 RAID

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10 Terms

1
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RAID 0

STRIPING; minimum 2 drives, no redundancy.

- Data is "split" evenly between the two drives.

- performance increase; does not provide redundancy because data is split in half, not copied

<p>STRIPING; minimum 2 drives, no redundancy.</p><p>- Data is "split" evenly between the two drives. </p><p>- performance increase; does not provide redundancy because data is split in half, not copied</p>
2
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RAID 1

MIRRORING; minimum 2 drives, redundancy.

- data is duplicated across both drives

- need twice as much storage for same amount of information

<p>MIRRORING; minimum 2 drives, redundancy.</p><p>- data is duplicated across both drives</p><p>- need twice as much storage for same amount of information</p>
3
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RAID 5

STRIPING WITH PARITY; minimum 3 drives, redundancy.

- data is split across different drives (like R0) but now there’s an additional disk that holds ‘parity’ data to rebuild data in case one drive is lost

- or, parity data can be split across all disks so all - 1 drives can be used to rebuild data

- may slow performance

<p>STRIPING WITH PARITY; minimum 3 drives, redundancy.</p><p>- data is split across different drives (like R0) but now there’s an additional disk that holds ‘parity’ data to rebuild data in case one drive is lost</p><p>- or, parity data can be split across all disks so all - 1 drives can be used to rebuild data</p><p>- may slow performance</p>
4
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RAID 10 (1+0)

STRIPE OF MIRRORS; minimum 4 drives, redundancy

- mirror all of our RAID 0 arrays; have a copy of each striped drives where data has been split

- speed of striping, redundancy of mirroring

<p>STRIPE OF MIRRORS; minimum 4 drives, redundancy</p><p>- mirror all of our RAID 0 arrays; have a copy of each striped drives where data has been split</p><p>- speed of striping, redundancy of mirroring</p>
5
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Is RAID a backup?

RAID maintains uptime/availability; it’s NOT a backup

6
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Parity block

Fault tolerance method used to rebuild data from other drives if one drive has failed; used in RAID 5

7
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RAID 0

Minimum 2 drives, no redundancy

8
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RAID 1

Minimum 2 drives, redundancy

9
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RAID 5

Minimum 3 drives, redundancy

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RAID 10

Minimum 4 drives, redundancy