HP StorageWorks Secure Path V3.0C for Linux and Linux Workgroup Edition Installation and Reference Guide (AA-RU7VD-TE, February 2004)

Managing Secure Path
86 Secure Path v3.0C for Linux and Linux Workgroup Edition Installation and Reference Guide
■ The configuration file for paths have this path marked as Preferred. Upon
reboot, this path will be marked as Preferred and deployed as Preferred if and
when Load Balancing is disabled.
If Load Balancing is enabled and you select a path, the system performs the
following actions:
■ If the path is on the standby controller, I/O moves to the standby controller
and the selected path is one of the Active paths.
■ If the path is on the active controller, the path continues to be used as one of
the set of Active paths.
Note: This selection and marking is not preserved across reboots or power cycling.
The restore command
Once a path has failed or has been taken off line by one or more events, the
spmgr restore command lets you restore one or more LUNS to their preferred
I/O path. This command lets you manually restore all or part of a configuration
when the Auto-Restore feature has been disabled.
A path to a device consists of an adapter (HBA) and a port on a controller
(WWNN). A unit on a storage system may be seen through several paths, for
example, more than one HBA and controller. The default for spmgr restore
is to return all LUNs to their preferred path. It will transition all LUNs to their
preferred controller and their adapter if one has been specified and if Load
Balancing is disabled.
By using one or more of the switches for this command, you have control of
restoring preferred paths using the following restore options:
■ If there is a preferred controller and:
— A preferred path on each controller, then the preferred path on the
preferred controller becomes active
— A preferred path only on the preferred controller, then the preferred path
on the preferred controller becomes active
— A preferred path on the non-preferred controller, then one path on the
preferred controller becomes active
— No preferred paths, then one path on the preferred controller becomes
active