Hard Drive Sizes And Types - HP AD510A - StorageWorks Modular Smart Array 1500 cs 2U Fibre Channel SAN Attach Controller Shelf Hard Drive Installation Manual

Installation Procedures - All Deployments
Table 3: RAID level comparison
RAID Level
RAID 0
RAID 1
RAID 1+0
RAID 5
RAID 6
* Drives in the array need to be striped across separate enclosures on different SCSI
buses.
Note:
Configuration Utility User Guide
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
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
I/O
Performance
Highest
High *
Medium
Low
. This guide is available on the Web and the
HP StorageWorks 1500 Modular Smart Array Installation Guide
Fault Storage
Tolerance Efficiency
None Highest
Highest * Low
Medium High
High Medium
HP Array