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Maintenance page
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When you select a unit and click Migrate Unit, a dialog box appears which
lists the drives in the unit and any additional available drives. In the dialog
box are two drop-down menus, one for choosing the RAID level and one for
choosing stripe size.
You can only migrate a unit to a RAID level that will be larger than the
original unit. For example, you can migrate from a RAID 5 array with 4
drives to a RAID 0 with four drives but you cannot migrate from a RAID 5
with four drives to a RAID 10 with four drives.
After you have specified changes to the unit, the Unit Maintenance screen
reflects your changes and shows the percentage of migration completed.
While the unit is migrating, you can still access the unit as normal but the
performance will be lower. You can adjust the I/O rate with the radio buttons
on the Controller Settings page. (See “Setting Background Task Rate” on
page 75.)
Remove Unit. Removes a selected unit and allows you to unplug the drives
and move the unit to another controller. The data on the unit remain intact.
When you click Remove Unit, you will be asked to confirm that you want to
proceed. When you confirm the removal, the unit number and information
will be removed from 3DM. (Units created in the future can reclaim this unit
number.)
The operating system is notified that the unit was removed.
Information about the unit remains intact on the drives. This allows the drive
or drives to be reassembled into a unit again on this controller, or if moved to
another controller.
Delete Unit. Deletes the selected unit and allows you to use the drives to
create another unit. The drives appear in the list of Available Drives.
Caution: Before you click Remove Unit, make sure the unit you are removing is
unmounted and the system is not accessing it. (For example, make sure you are
not copying files to the unit, and make sure that there are no applications with open
files on that unit.) You can unmount the unit by selecting the icon for it on the
desktop and dragging it to the Trash.
If a unit is not unmounted and you remove it, it is the equivalent of physically
yanking a hard drive out from under the operating system. You could lose data, the
system could hang, or the controller could reset.