Dell PowerVault MD3260i - Manual (Page 106)

Storage Partitioning
Storage partitioning enables hosts to share access to virtual disks in a storage array. You create a storage partition
when you define the following storage array assignments:
• A host
• A host group
• Virtual disk-to-logical unit number (LUN) mapping
The virtual disk-to-LUN mapping enables you to define which host group or host has access to a particular virtual disk in
the storage array.
After you create a virtual disk copy, the target virtual disk automatically becomes read
‑only to hosts to ensure that the
data is preserved. Hosts that have been mapped to a target virtual disk do not have write access to the virtual disk, and
any attempt to write to the read-only target virtual disk results in a host I/O error.
If you want hosts to have write access to the data on the target virtual disk, use the set virtualDiskCopy
command to disable the read-only attribute for the target virtual disk.
Virtual Disk Expansion
A Virtual Disk Expansion (VDE) is a modification operation that increases the capacity of a standard virtual disk or a
snapshot repository virtual disk. The increase in capacity is achieved by using the free capacity that is available in the
disk group of the standard virtual disk or the snapshot repository virtual disk.
This modification operation is considered to be “dynamic because you can continually access data on disk groups,
virtual disks, and physical disks throughout the entire operation.
A VDE operation can be performed on a primary virtual disk or a secondary virtual disk of a replication relationship.
You cannot perform a VDE operation on a replication repository virtual disk.
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