Editing lun paths – HP XP Array Manager Software User Manual
Page 99
After volumes have been allocated to a host, you can edit existing LUN path information to add new
paths or delete existing paths from a list of allocated volumes in the storage systems tree, hosts tree,
logical groups tree, and from a list of volumes returned from a search.
To set a new LUN path between a specific volume and a host , perform the allocate volume operation,
and to delete all the LUN path settings between a specific volume and a host , perform the unallocate
volume operation. In contrast, in LUN path editing, you can change the number of LUN paths and
the connection-destination ports according to operations. In particular, edit LUN paths to achieve the
following:
•
Improvement of I/O performance
If the usage frequency of an application increases, you can add LUN paths to increase the data
transmission speed and improve the I/O performance. If the usage frequency decreases, you can
delete the LUN paths.
•
Enhancements to system redundancy
To prepare for an error in storage systems or host ports, you can enhance the system redundancy
by configuring multiple LUN paths, with each using a different port.
•
Response to failures
When a port is disabled because of an error, you can configure LUN paths that temporarily use
alternate ports to continue system operation.
Because allocated volumes belong to a specific host group, the same target host port is set for all
volumes in any given host group. Therefore, when adding or deleting a host port for one or more
volumes, you must select all of the volumes that belong to that host group to maintain consistent LUN
path assignments for all volumes.
You can change host modes and host mode options depending on the situation, for example when
an application is added to the host and the operating system is upgraded.
To edit LUN paths when replacing a failed HBA or performing a planned HBA replacement, use any
of the following options, depending on your task purpose:
•
Add HBA
•
Exchange HBA
•
Remove HBA
You can use the LUN paths that were set for the old HBA for the new HBA, and delete LUN paths set
for an HBA that is no longer necessary. You can also edit LUN paths for multiple HBAs collectively.
Related topics
• Editing the host mode and host mode options
• Editing LUN paths when replacing a failed HBA
• Editing LUN paths when performing a planned HBA replacement
• Removing LUN paths after adding an HBA
Editing LUN paths
You can manage the LUN paths between storage systems and hosts by adding or deleting them as
needed.
You manage LUN paths on your storage system by controlling the connections between the storage
systems and hosts. This allows you to better adapt to changing storage system and network conditions.
User Guide
99