Silicon Graphics InfiniteStorage 4000 Series, Настройка и обслуживание

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164 Changing Volume Copy Settings
Copy priority has five relative settings ranging from highest to lowest. The highest
priority supports the volume copy, but I/O activity might be affected. The lowest
priority supports I/O activity, but the volume copy takes longer. You can change the
copy priority at these times:

Before the volume copy operation starts

While the volume copy operation has a status of In Progress

After the volume copy operation has completed when re-creating a volume copy
operation by using the
recopy volumeCopy
command
When you create a volume copy pair and after the original volume copy has
completed, the target volume is automatically defined as read-only to the hosts. The
read-only status of the target volume helps to make sure that the copied data on the
target volume is not corrupted by additional writes to the target volume after the
volume copy is created. You want to maintain the read-only status when you are
performing these tasks:

Using the target volume for backup purposes

Copying data from one volume group to a larger volume group for greater
accessibility

Planning to use the data on the target volume to copy back to the base volume in
case of a disabled snapshot (legacy) volume or failed snapshot (legacy) volume
At other times, you might want to write additional data to the target volume. You can
use the
set volumeCopy
command to reset the read/write permission for the
target volume.
NOTE
If you have set the volume copy parameters to enable host writes to the target
volume, the read request and the write request to the target volume are rejected while
the volume copy operation has a status of In Progress, Pending, or Failed.
The command has this form:
set volumeCopy target [ targetName ] [source
[ sourceName ]]

copyPriority=(highest | high | medium | low | lowest)

targetReadOnlyEnabled=(TRUE | FALSE)
NOTE
You can use the parameters as needed to help define your configuration.
This example shows the
set volumeCopy
command:
c:\...\sm X \client>smcli 123.45.67.88 123.45.67.89

-c “set volumeCopy target [\”Obi_1\”]

copyPriority=highest

targetReadOnlyEnabled=FALSE;”
This example shows how to use the command in a script file: