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Chapter 8. Configuring Units

116 3ware Serial ATA RAID Controller User Guide

RAID Level Migration (RLM) Overview

RAID level migration is the process of converting one RAID configuration to

another. When you migrate a unit to a different configuration, the user data on

it is redistributed to the format of the new configuration. This data

redistribution process is a background task, similar to the rebuild or verify

processes.

Figure 54 shows an example of how data is reconfigured during a migration.

In this example, the migration is from a 3-drive RAID 0 to a 4-drive RAID 5,

with both having the same stripe size. As can be seen, every piece of user data

is moved from its original physical location.

Figure 54. RAID Level Migration Example

Typically, a unit is reconfigured with the same or more storage capacity.

Sometimes additional drives are added. The following table shows valid

reconfigurations, some of which will require the addition of more drives.

Table 10: Valid Migration Paths

Destination

Source R0 R1 R5 R6 R10 R50 Single JBOD Spare

Yes No Yes Yes Yes Yes No No No

Yes No Yes Yes Yes Yes Yes No No

Yes No Yes Yes Yes Yes No No No

R10

Yes No Yes Yes Yes Yes No No No

R50

Yes No Yes Yes Yes Yes No No No

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AMCC 3WARE 9500S Guía de usuario Pagina 126