APC RAID Subsystem SCSI-SATA II Informações Técnicas Página 146

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Advanced Functions
5-28
Disk group expansion to expand the last existing free chunk
All existing free chunks except the one at the end of the disk group are deleted, and the last free chunk is expanded.
Defragment a disk group to consolidate free chunks
All existing free chunks are deleted, and a single free chunk at the end of the disk group is created.
5.5.2 Logical disk shrink
Logical disk shrink can be used to decrease the capacity of a logical disk. When performing logical disk shrink, the
capacity of the corresponding LUNs will be modified immediately and any attempt to access to the space beyond the new
capacity will be rejected. You have to shrink the partition and the file system on the host computer before shrinking the
logical disks in order to avoid data loss.
Shrink logical disk with an adjacent free chunk
When a logical disk is shrunk, the free chunk right after the logical disk is expanded by the capacity reduced at the shrunk
logical disk.
DG DG
LD 0
LD 1
LD 2
LD 0
LD 1
LD 2
free chunk 2
free chunk 0
disk group
defragment
free chunk 1
free chunk 0
DG DG
disk group
defragment
LD 0
LD 1
LD 2
LD 0
LD 1
LD 2
free chunk 1
free chunk 0
free chunk 0
Figure 5-18 Defragment a disk group to consolidate free chunks
DG DG
LD 0
LD 1
LD 2
LD 0
LD 2
LD 1
free chunk 0
shrink
LD 1
free chunk 0
Figure 5-19 Logical disk capacity shrink and expanding an adjacent free chunk
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