Administrator Guide

Grouping SAS I/O Ports Using Fault Domains
Front-end ports are categorized into fault domains that identify allowed port movement when a controller reboots or a port fails. Ports that
belong to the same fault domain can fail over to each other because they have connectivity to the same resources.
NOTE: Fault domains cannot be added or modied on SCv2000 or SCv3000 series storage systems. Storage Center creates and
manages fault domains on these systems.
Create a SAS Fault Domain
Create a SAS fault domain to group SAS ports for failover purposes on SC4020 controllers.
1 If you are connected to a Data Collector, select a Storage Center from the drop-down list in the left navigation pane.
2 From the SYSTEM menu, select Ports.
The Ports view is displayed.
3 Click (New) and select Create SAS Fault Domain.
The Create SAS Fault Domain dialog box opens.
4 In the Name eld, type a name for the fault domain.
5 In the Ports table, select the SAS ports to add to the fault domain.
When pairing SAS ports into the fault domain:
• Use one port from each controller.
• Make sure the paired ports have the same port number and are connected to the same server.
6 Click OK.
Delete a SAS Fault Domain
Delete a SAS fault domain if it is no longer needed.
1 If you are connected to a Data Collector, select a Storage Center from the drop-down list in the left navigation pane.
2 From the SYSTEM menu, select Ports.
The Ports view is displayed.
3 Click the Front End Ports tab.
4 Expand SAS and right-click the fault domain, then select Delete.
The Delete SAS Fault Domain dialog box opens.
5 Click OK.
Managing Disks and Disk Folders
Manage disks by adding new disks and organizing disks in disk folders.
Add disks and enclosures to accommodate greater data needs. The supported number of enclosures attached to Storage Center depends
on the controller and enclosure being used.
When adding disks be aware of the following.
• After disks are added, additional space may not be immediately available. Make sure to allow enough time for Unisphere to allocate
space for writes.
• Create a new disk folder only to address specic application program requirements. Creating a second disk folder may cause storage to
be used ineciently.
• Data cannot be written to unassigned disks.
Storage Center Maintenance
153