HP StorageWorks XP Remote Web Console Software - Manual (Page 10)

NOTE: When you use XP Auto LUN for the first time, you must reserve volumes for migration
destinations in advance. These reserved volumes are marked with the icon. When you specify
a volume to be migrated, icons of some reserved volumes ( ) that can be used as a migration
destination will change to the icons. For details on reserving volumes for migration destinations,
see “Reserving Migration Destinations for Volumes” (page 52) .
If you specify the volume you want to migrate in the window and click Target, XP Auto LUN displays
the list of disks of the parity groups that can be used as destinations. If you select the destination
disk area and click Graph, XP Auto LUN calculates the estimated volume usage rate after migration,
and displays the estimated usage rate in the window (see
Figure 5 (page 10) ). However, XP Auto
LUN cannot estimate the usage rate of any external volumes. If migrating an external volume, the
transition of the external volume usage rate is not displayed even if you click Plan. If the volume
usage rate of the migration source cannot be calculated, or if you do not need to know the transition
of the usage rate, you can migrate the volume without displaying the graph.
XP Auto LUN uses past resource usage rates, hard disk drive type information, and the RAID level
to calculate the estimated usage rate. In the example in
Figure 5 (page 10) , if the volume 00:03:06
in the parity group 2-1 is migrated to the reserved volume 01:01 in the parity group 1-2, the parity
group 2-1 can expect a 10% decrease in the average usage rate (from 21% to 11%). The destination
parity group 1-2 can expect a 13% increase in the average usage rate (from 12% to 25%). If the
estimated result is not satisfactory, you can change the migration destination.
Figure 5 Estimated Usage Rate for Parity Groups
You can create multiple migration plans. If there are any other high-usage volumes, you can continue
to create migration plans. If you finish creating migration plans, you can execute the migration
plans to start volume migrations.
For more detailed information about volume migrations, see “Migrating Volumes Manually”
(page 53) .
Hosts can perform I/O operations on volumes that are being migrated.
10 About XP Auto LUN Operations