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Expand Capacity
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GAM Client User’s Guide
Expand Capacity
GAM 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 Management (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
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Note
Although OCE and RLM operations are explained
separately in the following sections, these operations
may be combined.
Expanding a Logical Drive
Online Capacity Expansion is the ability to increase the size of a logical
system drive while normal reads and writes occur. 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 on the physical drives
allocated to the logical drive.Only one logical drive can be created per the
Expand operation. When performing this operation, you cannot change the
write cache, init drive, or strip 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.
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