Unisphere and Unisphere Central 2020 R1 Administrator's Guide

Enable Live Volume ALUA Optimization

Use the ALUA optimization wizard to enable ALUA optimization on existing Live Volumes that are eligible to be upgraded.

1. Click the HOME menu.
   The Unisphere CentralHome page is displayed.

   If a Storage Center is selected from the drop-down list in Unisphere Central, click (Home).

2. From the Data Mobility menu, click Replications & Live Volumes.
3. Click the Live Volumes tab.
   The Live Volumes view is displayed. If a Live Volume is not optimized, a banner message is displayed. The message states that Live Volumes are available that are eligible for ALUA optimization.
4. Click Update to ALUA Optimized.
   The Update to ALUA Optimized dialog box opens.
5. Select the Live Volumes that you want to optimize.
6. Select whether to reset the secondary server mappings.
   • If you select the Reset Secondary Server Mappings check box, the server mappings of the Secondary Live Volumes are reset and which causes an immediate outage. A manual rescan must be performed.
   • By default, the Reset Secondary Server Mappings check box is cleared and will not cause an outage. The secondary side servers must be restarted later during a maintenance operation.
7. Select whether to report non-optimized paths.
   • By default, the Report Non-optimized Paths check box is selected, and Live Volumes report non-optimized ALUA paths from the secondary system.
   • If you clear the Reset Secondary Server Mappings check box, Live Volumes does not report non-optimized ALUA paths from the secondary system.

   NOTE Using non-optimized paths is not recommended in Microsoft Windows environments and reporting non-optimized path reporting should be disabled. When all paths are reported as non-optimized, MPIO drivers do not function in a round-robin as expected. Data transfer is reduced to a single path causing a delayed failover.

   NOTE Certain Windows Server 2016 versions can support non-optimized path reporting properly. For more information and best practice guidelines for configuring MPIO on Microsoft Server 2016, see the Dell EMC SC Series Storage and Microsoft Multipath I/O white paper on the Dell support site.
8. Click OK.