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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 5 shows an example of how data is reconfigured during a migration. In this example, the migration is from a 4-drive RAID 0 to a 6-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 5.  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.

Valid Migration Paths
Source
Destination
R0
R1
R5
R10
R50
Single
JBOD
Spare
R0
Yes
No
Yes
Yes
Yes
No
No
No
R1
Yes
No
Yes
Yes
Yes
Yes
No
No
R5
Yes
No
Yes
Yes
Yes
No
No
No
R10
Yes
No
Yes
Yes
Yes
No
No
No
R50
Yes
No
Yes
Yes
Yes
No
No
No
Single
Yes
Yes
Yes
Yes
Yes
No
No
No
JBOD
No
No
No
No
No
No
No
No
Spare
No
No
No
No
No
No
No
No


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