EMC CX500I Configuration Guide - Page 40

RAID 0 Group (Nonredundant Array), Individual Disk Unit

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RAID Types and Trade-offs RAID 0 Group (Nonredundant Array) ! CAUTION A RAID 0 Group provides no protection for your data. EMC does not recommend using a RAID 0 Group unless you have some way of protecting your data, such as software mirroring. A RAID 0 Group consists of three to a maximum of sixteen disks. A RAID 0 Group uses disk striping, in which the hardware writes to or reads from multiple disks simultaneously. You can create up to 128 LUNs in any RAID 0 Group. Unlike the other RAID levels, with RAID 0 the hardware does not maintain parity information on any disk; this type of group has no inherent data redundancy. As a result, if any failure (including an unrecoverable read error) occurs on a disk in the LUN, the information on the LUN is lost. RAID 0 offers enhanced performance through simultaneous I/O to different disks. A desirable alternative to RAID 0 is RAID 1/0, which does protect your data. Individual Disk Unit An individual disk unit is a disk bound to be independent of any other disk in the cabinet. An individual unit has no inherent high availability, but you can make it highly available by using software mirroring with another individual unit. You can create one LUN per individual disk unit. If you want to apportion the disk space, you can do so using partitions, file systems, or user directories. 2-10 EMC CLARiiON CX300, CX500, CX500i, and CX700 Storage Systems Configuration Planning Guide

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2-10
EMC CLARiiON CX300, CX500, CX500i, and CX700 Storage Systems Configuration Planning Guide
RAID Types and Trade-offs
RAID 0 Group (Nonredundant Array)
CAUTION
!
A RAID 0 Group provides no protection for your data. EMC does
not recommend using a RAID 0 Group unless you have some way
of protecting your data, such as software mirroring.
A RAID 0 Group consists of three to a maximum of sixteen disks. A
RAID 0 Group uses disk
striping
,
in which the hardware writes to or
reads from multiple disks simultaneously. You can create up to 128
LUNs in any RAID 0 Group.
Unlike the other RAID levels, with RAID 0 the hardware does not
maintain parity information on any disk; this type of group has no
inherent data redundancy. As a result, if any failure (including an
unrecoverable read error) occurs on a disk in the LUN, the
information on the LUN is lost.
RAID 0 offers enhanced performance through simultaneous I/O to
different disks. A desirable alternative to RAID 0 is RAID 1/0, which
does protect your data.
Individual Disk Unit
An individual disk unit is a disk bound to be independent of any
other disk in the cabinet. An individual unit has no inherent high
availability, but you can make it highly available by using software
mirroring with another individual unit. You can create one LUN per
individual disk unit. If you want to apportion the disk space, you can
do so using partitions, file systems, or user directories.