Silicon Graphics InfiniteStorage 4000 Series, Configuring And Maintaining

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Chapter 8: Using the Synchronous Mirroring Premium Feature 151
a remote mirrored pair is a significant change to a storage array configuration. Setting
the write mode to
synchronous
and the synchronization priority to
highest
means that host write requests are written to the primary volume and then
immediately copied to the secondary volume. These actions help to make sure that the
data on the secondary volume is as accurate a copy of the data on the primary volume
as possible. The highest synchronization priority does, however, use more system
resources, which can reduce system performance.
This example shows how to use the command in a script file:
create remoteMirror primary=”Jan_04_Account”

secondary=”Jan_04_Account_B”
remoteStorageArrayName=”Tabor”

remotePassword=”jdw2ga05” syncPriority=highest

writeMode=synchronous;
After you have created a remote mirror, you can see the progress of data
synchronization between the primary volume and the secondary volume by running
the
show remoteMirror synchronizationProgress
command. This
command shows the progress as a percentage of data synchronization that has
completed.
Changing
Synchronous
Mirroring
Settings The
set remoteMirror
command lets you change the property settings for a
remote mirrored pair. Use this command to change these property settings:

The volume role (either primary or secondary)

The synchronization priority

The write order

The write mode
You can apply the changes to one or several remote mirrored pairs by using this
command. Use the primary volume name to identify the remote mirrored pairs for
which you are changing the properties.
This example shows how to use the
set remoteMirror
command:
c:\...\sm X \client>smcli 123.45.67.88 123.45.67.89

-c “set remoteMirror localVolume [Jan_04_Account]

syncPriority=medium

writeOrder=notpreserved

writeMode=asynchronous;”
This example shows how to use the command in a script file:
set remoteMirror localVolume [Jan_04_Account]

syncPriority=medium

writeOrder=notpreserved

writeMode=asynchronous;