Administrator Guide

Modifying Live Volumes with Automatic Failover
The following tasks apply to Live Volumes with Automatic Failover.
Update to the Local Tiebreaker
Updating to the local tiebreaker configures the Data Collector that Storage Manager is connected to as the tiebreaker. Storage Manager
provides the option to update to the local tiebreaker when the current Data Collector is not configured as the tiebreaker. If another Data
Collector is configured as the tiebreaker, such as a Remote Data Collector, do not configure the current Data Collector as the tiebreaker.
Steps
1. Click the Replications & Live Volumes view.
2. Click the Live Volumes tab then select a Live Volume.
3. Click Update to Local Tiebreaker.
The Update to Local Tiebreaker dialog box opens.
4. Select a Live Volume.
5. Click OK.
Enable Automatic Failover on a Live Volume
Enabling Automatic Failover allows the Live Volume to automatically failover to the secondary Live Volume after a failure. Automatic
Restore recreates the Live Volume relationship between the two Live Volumes. The active (previously secondary) Live Volume will remain
the in the primary role and the original primary Live Volume will become the secondary Live Volume.
Prerequisites
• The Live Volume must be configured as synchronous and high-availability.
• Both primary and secondary Storage Centers must be managed by Storage Manager.
Steps
1. Click the Replications & Live Volumes view.
2. Click the Live Volumes tab.
3. Select a Live Volume then click Edit Settings. The Edit Live Volume dialog box opens.
4. Select the Failover Automatically check box.
5. To enable automatic restore, select the Restore Automatically check box.
6. Click OK.
Live Volume ALUA
Asymmetric Logical Unit Access (ALUA) is a set of SCSI concepts and commands that define path prioritization for SCSI devices. It allows
paths to be described as fast, slow, or down and allows transitions between these states using a common standard. Live Volume ALUA
reports Active/Optimized and Active/Non-optimized ALUA states on the primary and secondary volumes/storage systems, respectively.
Storage Center supports Live Volume ALUA beginning in version 7.3.
Live Volume ALUA Optimization Considerations
Live Volume ALUA is used to control the priority of paths for the Primary and Secondary Live Volume components. By default, volume
mapping is Active/Optimized on the primary volume path and Active/Non-optimized on the secondary volume path. This section provides
information about the design features of Live Volume ALUA.
• ALUA is Automatically enabled: Live Volume ALUA is automatically applied when creating Live Volumes in any of the following
circumstances. Both the primary and secondary Storage Centers must support ALUA optimization.
• Creating a new Live Volume
• Converting a replicated volume to a Live Volume
• Converting an existing volume to a Live Volume
• Creating a Live Volume from a restore point (The restore point does not retain the new optimized ALUA information.)
When a Live Volume is created, the Report Non-optimized Paths feature is enabled by default.
Storage Center Replications and Live Volumes
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