Specifications

DS300f G2 Series User Manual
188
theRAID50logicaldrivegoingofine.
Component Minimum Maximum
NumberofAxles 2 16
PhysicalDrivesperAxle 3 32
PhysicalDrivesperLogicalDrive 6 256
rAid 50 Axles
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
No. of Drives
No. of
Axles
Drives
per
Axle
No. of Drives No. of Axles Drives per Axle
6 2 3,3 14 2 7,7
7 2 3,4 3 4,5,5
8 2 4,4 4 3,3,4,4
9 2 4,5 15 2 7,8
3 3,3,3 3 5,5,5
10 2 5,5 4 3,4,4,4
3 3,3,4 5 3,3,3,3,3
11 2 5,6 16 2 8,8
3 3,4,4 3 5,5,6
12 2 6,6 4 4,4,4,4
3 4,4,4 5 3,3,3,3,4
4 3,3,3,3
13 2 6,7
3 4,4,5
4 3,3,3,4
Advantages Disadvantages
•
HighReaddatatransactionrate
• MediumWritedatatransactionrate
• Goodaggregatetransferrate
• Highreliability
• Supportslargevolumesizes
• HigherdiskoverheadthanRAID5
Recommended Applications for RAID 50:
• File and Application servers
• Transaction processing
• Ofceapplicationwithmanyusersaccessingsmallles
rAid 60 – striPing of double PArity
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ofine.
Component Minimum Maximum
NumberofAxles 2 16
PhysicalDrivesperAxle 4 32
PhysicalDrivesperLogical
Drive
8 256
rAid 60 Axles
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.