HP AE326A HP StorageWorks 1500 Modular Smart Array Installation Guide (355901- - Page 32

Hard drive sizes and types, HP Array, Configuration Utility User Guide

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Installation Procedures - All Deployments Table 3: RAID level comparison RAID Level Alternative I/O Name Performance Fault Tolerance Storage Efficiency RAID 0 Data striping Highest None Highest RAID 1 RAID 1+0 Drive mirroring Data striping plus drive mirroring High * Highest * Low RAID 5 Data striping, with one set of distributed parity data Medium Medium High RAID 6 Data striping, Low with two sets of distributed parity data High Medium * Drives in the array need to be striped across separate enclosures on different SCSI buses. Note: For detailed information about the different RAID levels, refer to the HP Array Configuration Utility User Guide. This guide is available on the Web and the Documentation CD. Hard drive sizes and types Hard drives in each enclosure and included in the same array should be the same size and type. When drive sizes and types are mixed within a storage enclosure, the usable capacity and the processing ability of the entire storage sub-system is affected. When hard drives of different types or sizes are included in the same enclosure, the processing characteristics of the entire enclosure are reduced to that of the slowest and smallest drive. When hard drives of different sizes are included in a LUN, the LUN defaults to the smallest individual drive size and capacity in the larger drives is unused. 32 HP StorageWorks 1500 Modular Smart Array Installation Guide

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Installation Procedures - All Deployments
32
HP StorageWorks 1500 Modular Smart Array Installation Guide
Note:
For detailed information about the different RAID levels, refer to the
HP Array
Configuration Utility User Guide
. This guide is available on the Web and the
Documentation CD.
Hard drive sizes and types
Hard drives in each enclosure and included in the same array should be the same
size and type. When drive sizes and types are mixed within a storage enclosure,
the usable capacity and the processing ability of the entire storage sub-system is
affected.
When hard drives of different types or sizes are included in the same enclosure,
the processing characteristics of the entire enclosure are reduced to that of the
slowest and smallest drive.
When hard drives of different sizes are included in a LUN, the LUN defaults to the
smallest individual drive size and capacity in the larger drives is unused.
Table 3:
RAID level comparison
RAID Level
Alternative
Name
I/O
Performance
Fault
Tolerance
Storage
Efficiency
RAID 0
Data striping
Highest
None
Highest
RAID 1
RAID 1+0
Drive
mirroring
Data striping
plus drive
mirroring
High *
Highest *
Low
RAID 5
Data striping,
with one set of
distributed
parity data
Medium
Medium
High
RAID 6
Data striping,
with two sets
of distributed
parity data
Low
High
Medium
* Drives in the array need to be striped across separate enclosures on different SCSI
buses.