HP (Hewlett-Packard) XP12000 User Manual

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The auto migration function can move a high-usage volume to a higher HDD class group, forcing a 

low-usage volume out of that HDD class group. To do so, the auto migration function requires a minimum of 

5% difference in estimated disk usage between the two volumes. If the difference is less than 5%, this 

migration is considered ineffective and the volume is not moved.

Figure 3

Auto migration function example 1

The auto migration function can also move a volume from one parity group to another group of the same 

HDD class, forcing another volume out of the destination parity group. To do so, the auto migration 

function requires a minimum of 20% difference in estimated disk usage between the two volumes. If the 

difference is less than 20%, this migration is considered ineffective and the volume is not moved.

Figure 4

Auto migration function example 2