HP StorageWorks SAN Virtualization Services Platform Manager user guide (5697-0295, January 2010)

DescriptionProperty
The primary path through which virtual disks are presented to the host. Preferred
path is applicable to hosts with the following agent types:
• No Agent (UDH)—The HP SVSP requires that all UDHs be connected to more
than one DPM and running multipath software, therefore, the preferred path
specifies a primary DPM for presenting all assigned virtual disks to the host.
• No Agent (HBA)—The host entity was created by the VSM server to represent
an HBA that is not registered as belonging to a host. The HBA is installed on
a host that may not yet have an operating system installed. The HBA may be
connected to one or more DPMs. If the host has more than one HBA exposed
to the VSM server, a separate host entity with agent type No Agent (HBA) is
created for each HBA. All such host entities are replaced by one host name
after a UDH is defined to include all the HBAs on the host. The preferred path
specifies a primary DPM for presenting all assigned virtual disks to the host.
If no preferred path is set, VSM distributes virtual disks evenly between DPMs for
static load balancing. When you assign host permission to a virtual disk group,
all members of the virtual disk group are assigned to use the same DPM. All
subsequent virtual disks assigned permission to the host will be assigned to the
other DPM, until the distribution is even.
Both the preferred path and static load balancing are overridden if you set the
primary DPM when creating a virtual disk, or adding host permission to a virtual
disk.
Preferred Path
The host group to which the host belongs. This field is blank if the host does not
belong to a host group.
Host Groups
A free text display field. To modify the text that appears here, right-click the host
and select Manage > Edit Comment. You can use this field for any purpose.
Comment
The time at which the host was registered to the VSM, either automatically or
through user definition.
Creation Time
For a UDH, this is the time that a user defined the host. For a VSM server or host
entity with agent type No Agent (HBA), the user “system” is displayed here.
Created By
The last time one of the following was changed:
• The operating system
• The personality
• The preferred path
• The LUN range
• The HBA relations
• The comment
Modification Time
The name of the user who last made a modification to the host definition.Modified By
The first of the range of LUNs that can be assigned to virtual disks when they are
assigned to this host from this domain.
Defining LUN ranges ensures that, if a host is exposed to more than one domain,
all virtual disks are exposed to the host as different LUNs.
Not relevant for VSM servers.
First LUN
Managing host bus adapters170