Administrator Guide

NOTE: See the Deployment Guide for more information about cabling configurations.
NOTE: For more information about configuring hosts, see About Your Host.
If a component such as a RAID controller module or a cable fails, or an error occurs on the data path to the preferred RAID controller
module, virtual disk ownership is moved to the alternate non-preferred RAID controller module for processing. This failure or error is called
failover.
Drivers for multipath frameworks such as Microsoft Multi-Path IO (MPIO) and Linux Device Mapper (DM) are installed on host systems
that access the storage array and provide I/O path failover.
For more information about Linux DM, see Device Mapper Multipath for Linux. For more information about MPIO, see Microsoft.com.
NOTE: You must have the multipath driver installed on the hosts always, even in a configuration where there is only one
path to the storage system, such as a single port cluster configuration.
During a failover, the virtual disk transfer is logged as a critical event, and an alert notification is sent automatically if you have configured
alert destinations for the storage array.
Managing host port identifiers
You can do the following to manage the host port identifiers that are added to the storage array:
• Add—Add or associate a new host port identifier to a particular host.
• Edit—Change the host port identifier alias or user label. You can move (associate) the host port identifier to a new host.
• Replace—Replace a particular host port identifier with another host port identifier.
• Remove—Remove the association between a particular host port identifier and the associated host.
NOTE:
If there are no host port identifiers that are associated or unassociated to a particular host, the Manage Host
Port Identifiers option is disabled.
To manage a host port identifier:
1. In the AMW, select the Host Mappings tab.
2. Perform one of these actions:
• Right-click the host in the object tree, and select Manage Host Port Identifiers in the pop-up menu.
• From the menu bar, select Host Mappings > Manage Host Port Identifiers.
The Manage Host Port Identifiers dialog is displayed.
3. To manage the host port identifiers in the Show host port identifiers associated with list:
• For a specific host, select the host from the list of hosts that are associated with the storage array.
• For all hosts, select All hosts from the list of hosts that are associated with the storage array.
4. If you are adding a new host port identifier, go to step 5. If you are managing an existing host port identifier, go to step 10.
5. Click Add.
The Add Host Port Identifier dialog is displayed.
6. Select the appropriate host interface type.
7. Select the method to add a host port identifier to the host. You can select:
• Add by selecting a known unassociated host port identifier—Select the appropriate host port identifier from the existing list
of Known unassociated host port identifiers.
• Add by creating a new host port identifier—In New host port identifier, enter the name of the new host port identifier.
8. In Alias, enter an alphanumeric name of up to 30 characters.
9. In Associated with host, select the appropriate host.
The newly added host port identifier is added to the Host port identifier information area.
10. Select the host port identifier that you want to manage from the list of host port identifiers in the Host port identifier information
area.
11. Perform one of these actions for the selected host port identifier:
• To edit the host port identifier—Select the appropriate host port identifier and click Edit. The Edit Host Port Identifier dialog is
displayed. Update User label and Associated with host and click Save.
• To replace the host port identifier—Select the appropriate host port identifier and click Replace. The Replace Host Port
Identifier dialog is displayed. Replace the current host port identifier with a known unassociated host port identifier or create a
new host port identifier, update User label, and click Replace.
About your host
55