Dell PowerVault MD3060e Series, Cli Manual

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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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