Dell PowerVault MD3420 - Manual (Page 86)

Changing Virtual Disk Copy Settings
The set virtualDiskCopy command enables you to change the property settings for a virtual disk
copy pair. Using this command, you can change the following items:
• Copy priority
• Read/write permission for the target virtual disk
Copy priority has five relative settings, which range from highest to lowest. The highest priority supports
the virtual disk copy, but I/O activity might be affected. The lowest priority supports I/O activity, but the
virtual disk copy takes longer. You can change the copy priority at three different times in the operation:
• Before the virtual disk copy begins
• While the virtual disk copy has a status of In Progress
• After the virtual disk copy has completed re-creating a virtual disk copy using the recopy
virtualDiskCopy command
When you create a virtual disk copy pair and after the original virtual disk copy has completed, the target
virtual disk is automatically defined as read-only to the hosts. The read-only status of the target virtual
disk ensures that the copied data on the target virtual disk is not corrupted by additional writes to the
target virtual disk after the virtual disk copy is created. Maintain the read-only status when the following
conditions apply:
• You are using the target virtual disk for backup purposes
• You are copying data from one disk group to a larger disk group for greater accessibility
• You are planning to use the data on the target virtual disk to copy back to the source virtual disk in
case of a disabled or failed snapshot virtual disk
At other times you might want to write additional data to the target virtual disk. You can use the set
virtualDiskCopy command to reset the read/write permission for the target virtual disk.
NOTE: If you enabled host writes to the target virtual disk, read and write requests are rejected while
the virtual disk copy has a status of In Progress, Pending, or Failed.
The following syntax is the general form of the command:
set virtualDiskCopy target [targetName] [source
[sourceName]] copyPriority=(highest | high |
medium | low | lowest) targetReadOnlyEnabled=(TRUE | FALSE)
NOTE: Use one or both of the parameters as needed to help define your configuration. It is not
necessary to use either parameter.
The following example shows how to change parameters using the set virtualDiskCopy command:
client>smcli 123.45.67.89 -c "set virtualDiskcopy
target [\"Obi_1\"] copyPriority=highest
targetreadonlyenabled=false;"
The following example is the script file version of the command:
set virtualDiskcopy target ["Obi_1"] copyPriority=
highest targetreadonlyenabled=false;
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