Accusys ExaRAID GUI - Manual (Page 219)

Advanced Functions
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• 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.
• Expand a logical disk by allocating an adjacent free chunk and moving
logical disks
If the free chunk right after the selected logical disk is not sufficient for
expansion, the controller will allocate the free chunk and also start a
background task to move logical disks.
5.5.4 Disk group expansion
Disk group expansion can be used to increase the useable space of a
disk group by adding one or more disks to the disk group. When the
expansion task is complete, the new space is created in the end space of
the disk group. Logical disks can be created in the space set up by the
expansion.
• Disk group expansion to expand the last existing free chunk
If the disk group has free chunks in the end space, the capacity of the
free chunk will be increased after the expansion. The capacity of existing
logical disks will not be affected.
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
free chunk 1
DG DG
LD 1
LD 0
LD 1
LD 0
free chunk 0
free chunk 1
LD 2
expand
LD 1
Figure 5-23 Logical disk capacity expansion by
allocating an adjacent free chunk and
moving logical disks