HP StorageWorks XP Remote Web Console Software - Manual (Page 15)

Figure 10 Migrating a Volume Automatically to a Lower HDD Class
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 move one
volume into a parity group of the same HDD class, and force another volume out of that parity
group, the auto migration function requires a minimum of 20% difference in estimated disk usage
between the two volumes. If the difference in disk usage is less than 20%, this migration is
considered ineffective, and the volume is not moved.
Figure 11 Migrating a Volume Automatically within the Same HDD Class
NOTE: If there is more than one class between the class of the high-usage parity group that is a
candidate for the source and the low-usage parity group that is the target, a volume cannot be
moved easily. To use the auto migration function effectively, HP recommends that you provide one
or more reserved volumes that are to be the source for each class.
Interoperability with Other Products
The requirements and restrictions for performing XP Auto LUN operations are:
•
User types. If the user type of your user ID is storage partition administrator, you cannot use
XP Auto LUN. For details on the limitations when using Performance Monitor logged in as a
storage partition administrator, see the HP StorageWorks XP24000/XP20000 Performance
Monitor User Guide.
•
Combinations of volumes. The source and target volumes must be managed by the same
storage system. (An external volume can be used for source or target volume.)
Also, a combination of source and target volumes should satisfy the following conditions:
◦ The LDKC:CU:LDEV numbers of volumes take the value between 00:00:00 and 00:FE:FF
or between 01:00:00 and 01:FE:FF.
◦ The source and target volumes have the same emulation type and capacity.
◦ If the emulation type is not OPEN-V, both the source and target volumes are custom-sized
volume (CV), or both volumes are normal volumes.
Interoperability with Other Products 15