System information

Advanced Functions
5-29
• Shrink a logical disk without an adjacent free chunk
After a logical disk is shrunk, a free chunk is created next to the logical disk.
5.5.3 Logical disk expansion
Logical disk expansion can be used to increase the capacity of a logical disk by allocating free chunks and by moving
logical disks in the same disk group to consolidate a free chunk for the new space of the selected logical disks.
• Expand a logical disk by allocating an adjacent free chunk
If there is a free chunk right after the logical disk, the required capacity of the logical disk can be allocated immediately via
the free chunk.
• Expand a logical disk by moving logical disks to a free chunk
If there is no free chunk right after the selected logical disk, the controller will start a background task to move nearby
logical disks to fill the requested capacity.
DG DG
LD 0
LD 1
LD 2
LD 0
LD 1
LD 2
free chunk 0
free chunk 0
free chunk 1
shrink
LD 1
Figure 5-20 Logical disk capacity shrink and creating a new free chunk
DG
LD 0
LD 1
expand
LD 1
LD 2
DG
LD 0
LD 2
LD 1
free chunk 0
free chunk 0
Figure 5-21 Logical disk capacity expansion by allocating an adjacent free chunk
DG
LD 0
LD 1
expand
LD 1
LD 2
free chunk 0
free chunk 0
DG
LD 0
LD 2
LD 1
Figure 5-22 Logical disk capacity expansion by moving logical disks to a free
chunk