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the RAID 50 logical drive going offline.
Component
Minimum
Number of Axles
2
Physical Drives per Axle
3
Physical Drives per Logical Drive
6
rAid 50 A
xles
When you create a RAID 50, you must specify the number of axles. An axle refers to a single RAID 5 logical
drive that is striped with other RAID 5 logical drives to make RAID 50. An axle can have from 3 to 32 physical
drives, depending on the number of physical drives in the logical drive.
The chart below shows RAID 50 logical drives with 6 to 32 physical drives, the available number of axles, and
the resulting distribution of physical drives on each axle.
RAID 50 Logical Drive
Drives
No. of
No. of Drives
per
No. of Drives
Axles
Axle
6
2
3,3
14
7
2
3,4
8
2
4,4
9
2
4,5
15
3
3,3,3
10
2
5,5
3
3,3,4
11
2
5,6
16
3
3,4,4
12
2
6,6
3
4,4,4
4
3,3,3,3
13
2
6,7
3
4,4,5
4
3,3,3,4
188
Maximum
16
32
256
No. of Axles
Drives per Axle
2
7,7
3
4,5,5
4
3,3,4,4
2
7,8
3
5,5,5
4
3,4,4,4
5
3,3,3,3,3
2
8,8
3
5,5,6
4
4,4,4,4
5
3,3,3,3,4
Advantages
• High Read data transaction rate
• Medium Write data transaction rate
• Good aggregate transfer rate
• High reliability
• Supports large volume sizes
Recommended Applications for RAID 50:
• File and Application servers
• Transaction processing
• Office application with many users accessing small files
rAid 60 – s
d
P
triPing of
ouble
Arity
RAID 60 combines both RAID 6 and RAID 0 features. Data is striped across disks as in RAID 0, and it uses
double distributed parity as in RAID 6. RAID 60 provides data reliability, good overall performance and supports
larger volume sizes.
The total capacity of a RAID 60 logical drive is the smallest physical drive times the number of physical drives,
minus four.
RAID 60 also provides very high reliability because data is still available even if multiple physical drives fail (two
in each axle). The greater the number of axles, the greater the number of physical drives that can fail without
the RAID 60 logical drive going offline.
Component
Minimum
Number of Axles
2
Physical Drives per Axle
4
Physical Drives per Logical
8
Drive
rAid 60 A
xles
When you create a RAID 60, you must specify the number of axles. An axle refers to a single RAID 6 logical
drive that is striped with other RAID 6 logical drives to make RAID 60. An axle can have from 4 to 32 physical
drives, depending on the number of physical drives in the logical drive.
DS300f G2 Series User Manual
Disadvantages
• Higher disk overhead than RAID 5
Maximum
16
32
256
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