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Appendix
users with critical data which cannot be lost or
corrupted due to the failure of a single drive.
With RAID Level 1, the host sees what it believes
to be a single physical drive of a specific size: it
does not know about the mirrored pair.
The ATTO FastStream VT 5300 manages where
data is written and read, allowing one drive to fail
without the host knowing it has failed. RAID
Level 1 is used in applications containing mission
critical data. The ATTO FastStream VT 5300
supports an even number of 2 to 32 drives per
RAID Level 1 group.
Exhibit A-4 RAID Level 1: Data is written to two or
more drives simultaneously.
RAID Level 10
RAID Level 10 increases data transfer rates while
ensuring security by writing the exact same data
simultaneously to two or more different drives.
RAID Level 10 is used in applications requiring
high performance and redundancy, combining the
attributes of RAID Levels 1 and 0.
The ATTO FastStream VT 5300 supports an even
number of 4 to 32 drives per RAID Level 10
group.
Exhibit A-5 RAID Level 10 with mirroring and
spanning; redundancy is shown in shaded blocks.
RAID Level 5
RAID Level 5 increases reliability while using
fewer drives than mirroring by employing parity
redundancy. Distributed parity on multiple drives
allows you to rebuild a failed drive from the
remaining good drives. The ATTO FastStream
VT 5300 operates in degraded mode if a drive
fails.
The ATTO FastStream VT 5300 supports 3 to 32
drives per RAID Level 5 group.
Exhibit A-6 RAID Level 5 with parity blocks shaded.
RAID Level 1
Stripe Disk 0 Disk 1 Disk 2 Disk 3 Disk 4 Disk 5
0D0D0 D4 D4 D8 D8
1D1
D1 D5 D5 D9 D9
2D2
D2 D6 D6 D10 D10
3D3
D3 D7 D7 D11 D11
RAID Level 10
Stripe Disk 0 Disk 1 Disk 2 Disk 3 Disk 4 Disk 5
0D0D0 D1 D1 D2 D2
1D3
D3 D4 D4 D5 D5
2D6
D6 D7 D7 D8 D8
3D9
D9 D10 D10 D11 D11
RAID Level 5
Stripe Disk 0 Disk 1 Disk 2 Disk 3 Disk 4 Disk 5
0 D0D1D2D3D4P0-4
1 D6D7D8D9
P5-9 D5
2 D12 D13 D14
P10-14 D10 D11
3D18D19
P15-19 D15 D16 D17
4D24
P20-24 D20 D21 D22 D23
5
P25-29 D25 D26 D27 D28 D29