Administrator Guide

Change the Synchronization Mode for a Replication
Use the Edit Replication dialog box to change the sync mode of a synchronous replication or a synchronous simulated
replication. The synchronization mode can be changed with no service interruption. The replication temporarily becomes
unsynchronized when the synchronization mode is changed.
Prerequisites
The replication or simulated replication must be a synchronous replication.
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. Select the Sync Mode.
● 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.
Change the Replication Attributes
Use the Edit Replication dialog box to change replication attributes such as bandwith control, deduplication, and whether to
include active snapshot data.
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:
● Replication Bandwidth Control—Provides a list of definitions that control bandwidth usage between the local and
remote Storage Centers.
● Replication Deduplication—When selected, copies only the changed portions of the snapshot history on the source
volume, rather than all data captured in each snapshot. Deduplication saves bandwidth but is more resource intensive for
the Storage Center.
● Replicate Active Snapshot—When selected, copies all the current, unfrozen volume data on the volume. This option
cannot be disabled for synchronous replication.
● Replicate Storage To Lowest Tier:—When selected, forces all data to be written to the lowest storage tier of the
target volume.
NOTE:
This option is only available when the transfer type is asynchronous and only when the feature is enabled on
the Data Collector.
222 Storage Center Replications and Live Volumes