IBM Midrange System DS4000 Series Hardware Manual page 260

Note: If the RAID level of the array is 3, 5, or 6, and the drive enclosure has enclosure loss
protection, the Add Drives option displays only drives that ensure enclosure loss
protection. If the RAID level is 1 or 10, a minimum of two drives must be added.
Click OK after selecting the capacity to add. A warning message appears indicating that this
operation cannot be stopped after it is started and that it might take a long time to complete.
However, the data on the selected logical drive and all other logical drives on this array (if new
drives have been added) remains accessible during this time. As with all operations requiring
a redistribution of the data on the physical disks, the procedure might affect the performance.
From the host operating system, the administrator will then have to perform a procedure in
order to utilize the newly allocated space.
Extending a basic disk on a Windows platform
In the following example, we have a Windows 2008 system with a basic disk partition of 1 GB.
The partition has data on it, the partition is disk 6, and its drive letter is J. We have used
DS5000 Dynamic Volume Expansion (DVE) to expand the logical drive by adding 100 GB.
This leaves the operating system with a disk of 101 GB, with a partition of 1 GB and free
space of 100 GB, as shown in Figure 4-107.
Figure 4-107 The Windows 2008 basic disk with free space
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IBM Midrange System Storage Hardware Guide