Software Support

RAID 0 characteristics:

• Groups

disks as one large virtual disk with a capacity of (smallest disk size) *

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

disks as one virtual disk with the capacity of

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.

• RAID 1 is more expensive in terms of disk space since twice the number of disks are used than required to store

the data without redundancy.

RAID Level 5 (Striping With Distributed Parity)

RAID 5 provides data redundancy by using data striping in combination with parity information. Rather than dedicating a

physical disk to parity, the parity information is striped across all physical disks in the disk group.