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Planning: MD3600f Series Storage Array Terms and Concepts 49
Virtual Disk Capacity Expansion
When you configure a virtual disk, you select a capacity based on the amount
of data you expect to store. However, you may need to increase the virtual disk
capacity for a standard virtual disk by adding free capacity to the disk group.
This creates more unused space for new virtual disks or to expand existing
virtual disks.
Disk Group Expansion
Because the storage array supports hot pluggable physical disks, you can add
two physical disks at a time for each disk group while the storage array
remains online. Data remains accessible on virtual disk groups, virtual disks,
and physical disks throughout the operation. The data and increased unused
free space are dynamically redistributed across the disk group. RAID
characteristics are also reapplied to the disk group as a whole.
Disk Group Defragmentation
Defragmenting consolidates the free capacity in the disk group into one
contiguous area. Defragmentation does not change the way in which the data
is stored on the virtual disks.
Disk Group Operations Limit
The maximum number of active, concurrent disk group processes per
installed RAID controller module is one. This limit is applied to the following
disk group processes:
• Virtual disk RAID level migration
• Segment size migration
• Virtual disk capacity expansion
• Disk group expansion
• Disk group defragmentation
book.book Page 49 Wednesday, June 8, 2011 5:01 PM