Administrator's Guide

Storage growth may occur in three forms:
• Extend unallocated space from the original logical disks or LUNs.
• Alter LUNs to contain additional storage.
• Add new LUNs to the system.
The additional space is then extended through a variety of means, depending on which type of
disk structure is in use.
Expanding storage
Expansion is the process of adding physical disks to an array that has already been configured.
The logical drives (or volumes) that exist in the array before the expansion takes place are
unchanged, because only the amount of free space in the array changes. The expansion process
is entirely independent of the operating system.
NOTE: See your storage array hardware user documentation for further details about expanding
storage on the array.
Extending storage using Windows Storage Utilities
Volume extension grows the storage space of a logical drive. During this process, the administrator
adds new storage space to an existing logical drive on the same array, usually after the array has
been expanded. An administrator may have gained this new storage space by either expansion
or by deleting another logical drive on the same array. Unlike drive expansion, the operating
system must be aware of changes to the logical drive size.
You extend a volume to:
• Increase raw data storage
• Improve performance by increasing the number of spindles in a logical drive volume
• Change fault-tolerance (RAID) configurations
For more information about RAID levels, see the Smart Array Controller User Guide, or the document
titled Assessing RAID ADG vs. RAID 5 vs. RAID 1+0. Both are available at the Smart Array controller
web page or at http://h18000.www1.hp.com/products/servers/proliantstorage/arraycontrollers/
documentation.html.
Extend volumes using Disk Management
The Disk Management snap-in provides management of hard disks, volumes or partitions. It can
be used to extend a dynamic volume only.
NOTE: Disk Management cannot be used to extend basic disk partitions.
Guidelines for extending a dynamic volume:
• Use the Disk Management utility.
• You can extend a volume only if it does not have a file system or if it is formatted NTFS.
• You cannot extend volumes formatted using FAT or FAT32.
• You cannot extend striped volumes, mirrored volumes, or RAID 5 volumes.
For more information, see the Disk Management online help.
Expanding storage for EVA arrays using HP P6000 Command View
Presenting a virtual disk offers its storage to a host. To make a virtual disk available to a host, you
must present it. You can present a virtual disk to a host during or after virtual disk creation. The
virtual disk must be completely created before the host presentation can occur. If you choose host
presentation during virtual disk creation, the management agent cannot complete any other task
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