Avago Technologies 3ware 9650SE-12ML (Channel) - Manual (Page 146)

Configuring Units
134 3ware SAS/SATA RAID Software User Guide, Version 9.5.1
Deleting a Unit through 3DM
In 3DM, the command for deleting a unit is on the Maintenance page. Be
sure to follow steps 1 through 3 in the instructions before using the Delete
command.
To delete a unit through 3DM
1 Make sure the operating system is not accessing the unit you want to
delete.
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.
2 Backup any data you want to keep.
3 Unmount the unit.
This step is very important. If a unit is not unmounted and you delete 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.
Under Windows, go to Start > Administrative Tools > Computer
Management , and select Disk Management. Remove the logical drive
letter for the unit.
Under Linux and FreeBSD, you can unmount the unit with this command:
umount <mount location>
4 In 3DM, choose Management > Maintenance .
5 In the Unit Maintenance section of the Maintenance page, select the unit
you want to remove and click
Delete Unit .
6 When a message asks you to confirm, click OK .
Configuration information associating the drives with the unit is deleted,
and the individual drives appear in the Available Drives list (Figure 58).
You can now use them as part of another unit, or designate them as
Spares, for use in a rebuild.