Hp XP20000XP24000 Disk Array Instrukcja Użytkownika Pobierz pdf (Strona 14)

Notes:

When you use 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” on page 41.

If youspecify thevolumeyou want to migrateinthe window andclick Target,AutoLUN displays thelist

of disks of the parity groups that can be used as destinations. If you select the destination disk area

and click Graph, Auto LUN calculates the estimated volume usage rate after migration, and displays the

estimated usage rate in the window (see Figure 6 on page 14). However, Auto LUN cannot estimate

the usage rate of any external volumes. In case of migrating an external volume, the transition of the

external volume usage rate is not displayed even if you click Plan. Ifthe volume usagerateofthe

migrationsourcecannotbecalculatedorifyou do notneedtoknowthe transition of theusage rate,you

canmigrate thevolumewithout displaying the graph.

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 6 on page14, if thevolume00:03:06inthe 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 10 percent decrease in the average usage rate (from 21 percent to 11 percent). The destination

parity group1-2 canexpecta13 percent increaseinthe averageusage rate (from12percent to 25

percent). If the estimated result is not satisfactory, you can change the migration destination.

gure 6 Estimated Usage Rate for Parity Groups

u can create multiple migration plans. If there are any other high-usage volumes, you can continue to

eate migration plans. If you ﬁ nish creating migration plans, you can execute the migration plans to

startvolumemigrations.

For more detailed information about volume migrations, see “Migrating Volumes Manually” on page 42.

Hosts can perform I/O operations on volumes that are being migrated. This section explains why.

Note:

The storage system documents (including this manual) use the term source volumes to refer to

volumesthatshouldbemigrated. Theterm target volumes is used for volumes that should become

migration destinations.

About Auto LUN Operations

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Hp XP20000XP24000 Disk Array Instrukcja Użytkownika Strona 14