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Compaq Infortrend Manuale Utente

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Infortrend
1-4
Block 1
Block 2
Block 3
Block 4
Block 5
Block 6
Block 7
Block 8
Block 1
Block 3
Block 5
Block 7
Block 2
Block 4
Block 6
Block 8
Striping
LogicalDrive
PhysicalDisks
Block 1
Block 2
Block 3
Block 4
Block 5
Block 6
Block 7
Block 8
Block 1
Block 2
Block 3
Block 4
Mirror 1
Mirror 2
Mirror 3
Mirror 4
Mirroring
L o g i c a l   D r i v e
P h y s i c a l   D i s k s
Block 1
Block 2
Block 3
Block 4
Block 5
Block 6
Block 7
Block 8
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Block 1
Block 3
Block 5
Block 7
Block 2
Block 4
Block 6
Block 8
Striping
Logical Drive
Physical Disks
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Mirror 1
Mirror 3
Mirror 5
Mirror 7
Mirror 2
Mirror 4
Mirror 6
Mirror 8
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Striping
Mir
ro
r
RAID 0
Disk Striping
Figure 1 - 4 RAID 0
RAID 0 provides the highest performance
but no redundancy.  Data in the logical
drive is striped (distributed) across several
physical drives.
RAID 1
Disk Mirroring
Figure 1 - 5 RAID 1
RAID 1 mirrors the data stored in one
hard drive to another.  RAID 1 can only
be performed with two hard drives.  If
there are more than two hard drives,
RAID (0+1) will be performed
automatically.
RAID (0+1)
Disk Striping with Mirroring
Figure 1 - 6 RAID (0+1)
RAID (0+1) combines RAID 0 and RAID 1 -
Mirroring and Striping. RAID (0+1) allows
multiple drive failure because of the full
redundancy of the hard drives. If there are
more than two hard drives assigned to
perform RAID 1, RAID (0+1) will be
automatically applied.
RAID 1
Disks required
2
Capacity
N/2
Redundancy
Yes
RAID 0
Minimum
Disks required
2
Capacity
N
Redundancy
No
RAID (0+1)
Minimum
Disks required
4
Capacity
N/2
Redundancy
Yes