Users Guide

RAID 0 characteristics:

• Groups n disks as one large virtual disk with a capacity of (smallest disk size) *n disks.

• Data is stored to the disks alternately.

• No redundant data is stored. When a disk fails, the large virtual disk fails with no means of rebuilding the data.

• Better read and write performance.

RAID level 1 - mirroring

RAID 1 is the simplest form of maintaining redundant data. In RAID 1, data is mirrored or duplicated on one or more physical disks. If a

physical disk fails, data can be rebuilt using the data from the other side of the mirror.

RAID 1 characteristics:

• Groups n + n disks as one virtual disk with the capacity of n disks. The controllers currently supported by Storage Management allow

the selection of two disks when creating a RAID 1. Because these disks are mirrored, the total storage capacity is equal to one disk.

• Data is replicated on both the disks.

• When a disk fails, the virtual disk still works. The data is read from the mirror of the failed disk.

• Better read performance, but slightly slower write performance.

• Redundancy for protection of data.

Understanding RAID concepts