User Guide

4-30 Configuration

4.8 Expanding Capacity

GAM TT provides an advanced configuration mode known as MORE2

(Mylex Online RAID Expansion 2) which provides two features, Online

Capacity Expansion and Extension (OCE), and RAID Level Migration

(RLM). These features allow you to increase the capacity of a RAID array

in a variety of ways. All of the following operations are available while the

controller is online. The operations are performed in the background

while normal data operations occur.

• Add a physical drive or drives to the system

• Add a logical drive to the system

• Increase the size of a logical drive or drives in the system

• Change RAID level on a logical drive or drives

MORE2 operations have the following restrictions:

• no channel swapping during more operation

• no operation on a spanned array

• result configuration group may not exceed 16 physical disks

Note:

Although OCE and RLM operations are explained

separately in the following sections, these operations may

be combined.

4.8.1 Expanding an Array on Mylex Controllers

Expand an existing array by adding physical drives to increase the size

of the existing logical drive. The expansion can be obtained by adding

one or more physical drives to the system, changing the RAID level

and/or increasing the amount of space allocated to the logical drive(s).

One or multiple logical drive(s) can be created per the Expand operation.

When performing this operation, you cannot change the stripe size of an

existing logical drive.

Added capacity amounts are rounded up to the next whole megabyte on

the physical drives. This means that the space is allocated on the

physical drives with one megabyte granularity. The existing array can be

expanded to a maximum of 1–32 drives.