Hard Drive Sizes And Types - HP StorageWorks Modular Smart Array 1500 cs Installation Manual

Table 3: RAID Level Comparison
RAID Level
RAID 0
RAID 1
RAID 1+0
RAID 5
RAID ADG
* Drives in the LUN are striped across separate enclosures on SCSI different buses.
Note:
Configuration Utility User Guide
Documentation CD.

Hard drive sizes and types

Hard drives in each enclosure and included in the same LUN 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 type or size 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.
Modular Smart Array 1500 cs Installation Guide
Alternative
Name
Data striping
Drive
mirroring
Data striping
plus drive
mirroring
Data striping,
with one set of
distributed
parity data
Data striping,
with two sets
of distributed
parity data
For detailed information about the different RAID levels, refer to the
Installation Procedures - All Deployments
I/O
Performance
Highest None
High * Highest *
Medium Medium
Low High
. This guide is available on the MSA1500 cs
Fault Storage
Tolerance Efficiency
Highest
Low
High
Medium
HP Array
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