source logical drive candidates and the target logical drive candidates. You can use the
show VolumeCopy
sourceCandidates
command and the
show VolumeCopy targetCandidates
command only after you have
enabled the VolumeCopy premium feature.
Creating a logical VolumeCopy
Attention:
Possible loss of data access
– A VolumeCopy overwrites data on the target logical drive.
Ensure that you no longer need the data or have backed up the data on the target logical drive before
you start a VolumeCopy operation.
When you create a VolumeCopy, you must define which logical drives that you want to use for the
source logical drive and the target logical drive. You define the source logical drive and the target logical
drive by the name of each logical drive. You can also define the copy priority and choose whether you
want the target logical drive to be read-only after the data is copied from the source logical drive.
The command takes this form:
create VolumeCopy
source=”
sourceName
” target=”
targetName
”
[copyPriority=(highest | high | medium | low | lowest)
targetReadOnlyEnabled=(TRUE | FALSE)]
Important:
Setting the
targetReadOnlyEnabled
attribute to
false
breaks the one-to-one relationship
between the source and target VolumeCopy logical drives. Therefore, any data that are written to the
target VolumeCopy logical drive will not be copied to the source VolumeCopy logical drive. In addition,
these data will be lost if you recopy of the source VolumeCopy logical drive to the target VolumeCopy
logical drive.
Before you run the
create VolumeCopy
command, perform these actions:
v
Stop all I/O activity to the source logical drive and the target logical drive.
v
Dismount any file systems on the source logical drive and the target logical drive, if applicable.
This example shows the
create VolumeCopy
command:
c:\...\...\client>smcli 123.45.67.89 -c “create
VolumeCopy source=\”Jaba_Hut\” target=\”Obi_1\”
copyPriority=medium targetrReadOnlyEnabled=TRUE;”
The command in this example copies the data from the source logical drive named Jaba_Hut to the target
logical drive named Obi_1. Setting the copy priority to
medium
provides a compromise between how
quickly the data is copied from the source logical drive to the target logical drive and the amount of
processing resources that are required for data transfers to other logical drives in the storage subsystem.
Setting the
targetReadOnlyEnabled
parameter to
TRUE
means that write requests cannot be made to the
target logical drive, making sure that the data on the target logical drive stays unaltered.
This example shows how to use the command in a script file:
create VolumeCopy source=”Jaba_Hut” target=”Obi_1”
copyPriority=medium targetReadOnlyEnabled=TRUE;
After the VolumeCopy operation is completed, the target logical drive automatically becomes read-only to
hosts. Any write requests to the target logical drive are rejected, unless you disable the Read-Only
attribute by using the
set VolumeCopy
command.
To view the progress of a VolumeCopy, use the
show logicalDrive actionProgress
command. This
command returns information about the logical drive action, the percentage completed, and the time
remaining until the VolumeCopy is complete.
Chapter 9. Using the VolumeCopy Premium Feature
9-5
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