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Virtual volume names
If a virtual volume was created on the device, the virtual volume is given the device name, followed by _vol. For example, if the
device name is "Mydevice1", the virtual volume created on the device will be named Mydevice1_vol. You can rename the device
or virtual volume at any time in the properties dialog box.
Device names
To avoid entering a different name for each device you are creating, you can enter a base name to be used for all the devices.
Each device is given this name followed by an underscore and an incremented number. For example:
● base name_1
● base name_2
You can also change the name of individual devices if desired.
The Add Local/Remote Mirror wizards
You can mirror a device locally or remotely using the Add Local Mirror wizard or the Add Remote Mirror wizard. When you add
a local mirror, a device in the local cluster is used to create a RAID-1 device. If the local device you are mirroring is already a
RAID-1, the mirror is added as another leg.
For a remote mirror, a device in the remote cluster is used to create a distributed device. You can mirror a device with or
without a volume on top. When creating a remote mirror, the mirror must not be in a consistency group.
NOTE: For a mirror virtual volume to be thin-enabled, the supporting devices must be thin-capable.
Synchronizing data
For a remote mirror, you can indicate whether or not to perform an initial data synchronization between the devices if the
device does not have a virtual volume. Note that this is an initial synchronization. If you choose not to perform an initial
synchronization, future writes are still be mirrored. If the device has a virtual volume, the data is automatically synchronized.
If the device contains data you want to preserve, you should synchronize. Note that any data on the target device will be
overwritten.
Selecting a consistency group or detach rule for distributed devices
Because a distributed device is created when you mirror a device remotely, you must select a consistency group or a detach rule
for the distributed device. If you add the distributed device to a consistency group, the rule set used for the group will be used
for the distributed device.
You have the option of adding the volumes to a consistency group or selecting a rule set for the distributed devices. If you do
not add the distributed device to a consistency group, you must select from the predefined detach rules, or you can use the
CLI to create a detach rule which will automatically appear in the Rule Set drop-down selection box. For more information on
creating and managing detach rules, refer to the CLI Guide for metro node.
NOTE: You can only apply user-created rule sets to distributed devices that are not in a consistency group.
Selecting target devices to use as mirrors
When creating a mirror, you can select target devices automatically or manually. If you click AUTO-GENERATE MIRROR
MAPPINGS in either wizard, metro node selects a target device of the same size. If no devices are available, the appropriate
message displays. While you can manually select a target device of larger capacity, this is not recommended because you cannot
use the extra capacity. You can also save mirror mappings to a file on your system.
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Provisioning storage