Administrator Guide

Steps
1. Click the HOME menu.
The Unisphere Central Home page is displayed.
If a Storage Center is selected from the drop-down list in Unisphere Central, click
(Home).
2. From the STORAGE menu, click Volumes.
The Volumes view is displayed.
3. Select the volume to replicate.
4. Click
(More Actions) and select Replicate.
The New Replication wizard opens.
5. On the Select Target Storage Center page, select the Storage Center on which you want to replicate the volume and
click Next.
If Fibre Channel or iSCSI connectivity is not configured between the local and remote Storage Centers, a dialog box opens.
Click Yes to configure iSCSI connectivity between the Storage Centers.
6. On the Select Target Volume page, set the volume attributes as needed. For information about the settings click Help.
7. On the Settings page, select the transfer type and set the replication attributes and click Next. For information about the
settings click Help.
8. On the Summary page, review the replication settings summary.
● Click Finish to create and start the replication.
● Click Back to change your settings.
Modifying Replications
Modify a replication if you want to enable or disable replication options, convert it to a Live Volume, or delete it.
Change the Transfer Type for a Replication
Use the Edit Replication dialog box to change the transfer type or the replication attributes for a replication or a simulated
replication. A replication can be changed from synchronous to asynchronous or asynchronous to synchronous with no service
interruption.
Steps
1.
If a Storage Center is selected from the drop-down list in Unisphere Central, click
(Home).
The Unisphere Central Home page is displayed.
2.
From the DATA MOBILITY menu, click Replications & Live Volumes.
The Replications & Live Volumes view opens to the Replications tab.
3.
Select the replication to change and click (Edit).
4. Edit any of the following settings as needed:
● Asynchronous: When selected, copies snapshots from the source volume to the destination volume. If Replicate
Active Snapshot is enabled, data that is written to the source volume is queued for delivery to the destination volume.
If the local Storage Center or site fails before the write is delivered, it is possible that writes will not be delivered to the
destination volume.
● Synchronous: When selected, keeps the source and destination volume fully synchronized at all times by making sure
that each write is successfully written to both the source volume and the destination volume before responding to the
server.
○ High Availability Mode: Accepts IO requests to the source volume when the destination volume is unavailable (or
when latency is too high) to avoid interrupting service. However, if writes are accepted to the source volume, the
destination volume data becomes stale.
○ High Consistency Mode: Prevents IO requests to the source volume when the destination volume is unavailable to
ensure that the volumes remain identical. However, the source volume cannot be modified during this time, which can
interrupt operations.
Storage Center Replications and Live Volumes
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