Configuring lu paths in nas environments – HP StorageWorks XP Remote Web Console Software User Manual
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If a hardware failure (such as a CHA failure) occurs, some LU paths might be disabled and some I/O
operations might be stopped. To avoid this situation, the system administrator can define alternate
LU paths. If one LU path fails, the alternate path takes over the host I/O.
For more information, see:
• Defining LU paths
• Changing or viewing LU path settings
• Defining and viewing alternate paths
For more information about LUN configuration, see “
Overview of Volume Manager and Custom
NOTE:
•
In iSCSI environments, you can define up to 1,024 LU paths for one iSCSI target and up to 1,024
LU paths for one port.
•
You cannot define LU paths to LUN On-Demand volumes.
•
You cannot define LU paths to volumes reserved by Auto LUN XP.
•
You can create up to 64 iSCSI targets for one Fibre Channel port.
•
You cannot define LU paths to journal volumes.
•
You cannot define LU paths to pool volumes.
•
In iSCSI environments, you cannot define LU paths to logical volumes that do not have the
Read/Write access attribute.
•
You cannot define LU paths to volumes on which a volume management area (VMA) is set.
Configuring LU paths in NAS environments
In Fibre Channel or iSCSI environments, you must classify hosts into host groups based on the platform.
In NAS environments, however, you do not need to classify hosts. In NAS environments, hosts attached
to a NAS port are automatically registered in a host group named User.
In NAS environments, LUs are classified into system LUs or user LUs. System LUs contain system
information necessary for managing the NAS environment and can be manipulated only by HP service
representatives. User LUs contain data that can be accessed by network users. When configuring
NAS systems, you must define paths between hosts and user LUs.
gives an example of defining paths between hosts and user LUs. In NAS environments, paths
are always defined between a user LU and a group of four ports. Because of this multi-path
configuration, hosts can access the user LU even if one of the paths fails.
XP LUN Configuration and Security Manager User Guide
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