3DM 2 Reference
Caution: Before you click Remove Unit, make sure the unit you are removing is unmounted and no I/Os are being issued. (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.)
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 sys- tem. Resulting behavior depends on which operating system you are using and what kind of I/O is being done, however you will typically see really bad results, bad errors, and most likely a reset of the controller or a system hang.
To unmount a unit under windows, use Administrative Tools > Computer Management > Disk Management. In the Computer Management window,
To unmount a unit under Linux, unmount the mount point to where the RAID unit is mounted. For example, if you want to remove unit 0 and you know that 0 corresponds to /dev/sdb, you should unmount all partitions for sdbx (where x is the number of the parti- tion).
umount /dev/sdbx
For FreeBSD, the command would be
umount /dev/twedx
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. In Linux the device node associated with this unit is removed. In Windows the Device Manager will reflect the changes under the disk drives icon.
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.
Warning: Physically removing drives which are not in hotswap carriers can result in a system hang or may even damage the system and the drive.
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.
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