7.3.2 Setting virtualization configuration information

(a) When host information is updated

If collected virtualization configuration information includes host information that indicates that a host is already registered in the IM configuration management database, IM Configuration Management treats the collected host information and the registered host information as being the same and updates the host type in the host information. If the host type in the collected host information differs from the host in the host information registered in the IM configuration management database, IM Configuration Management does not update the host information because the hosts might be different despite having the same host name. If, however, the host type of the hosts is Unknown, IM Configuration Management updates the host information. Note also that the status of the collection of virtualization configuration information is not the same for a registered host whose host type is different and for a virtualization system management host managing a registered host whose host type is different. Table 7-21 describes the host type conditions for updating host information, and Table 7-22 describes changes in the status of the collection for virtualization configuration information.

Table 7‒21: Host type conditions for updating host information

Type of host from which information collected	Registered host type
	Physical host	Logical host	Virtual host	Unknown
Physical host	Y	N	N	Y
Logical host	--	--	--	--
Virtual host	Y/N#1	N	Y	Y
Unknown (hosts managed by HCSM not running Hitachi Compute Blade logical partitioning feature)	N	N	N	Y
Unknown#2	Y	--	Y	--

Table 7‒22: Changes in the status of virtualization configuration information collection

Status of virtualization configuration information collection	Trigger for changing the status of virtualization configuration information collection
No information collected	Host information has not been collected yet.
Collection failed	The collection of host information failed because an attempt to connect to the host failed, the user could not be authenticated in the OS, or a condition for managing the virtualization system configuration was not met.
Information collected	The collection of host information was successful.
Mismatch	The host type in the collected host information differs from the host type registered in the IM configuration management database.

When virtualization configuration information is collected from the virtualization system management host, the virtualization configuration information on the hosts managed by the virtualization system management host is updated. Also, when this information is collected, the information (VMM host information) about the relationship between the virtualization system management host and VMM hosts is collected and stored in the IM configuration management database. However, if the virtualization system management host is deleted or the virtualization configuration information of the virtualization system management host is changed, the stored VMM host information will be deleted. For details, see 7.3.2(3)(c) When VMM host information is deleted.

If virtualization configuration is changed when virtualization configuration is collected, the virtualization configuration is changed as shown in the following table.

Table 7‒23: Virtualization configuration after collection

Change	Virtualization configuration after collection
A virtual host is added.	The host is added, and VMM host information is provided.
A virtual host is deleted.	VMM host information of the host is deleted. The host is displayed directly under the Host List because the relationship between the virtual host and the VMM host is broken.
A virtual host is moved.	VMM host information of the host is updated.
A stopped virtual host starts.	No configuration change.
A running virtual host stops.	No configuration change.
A running virtual host is suspended.	No configuration change.
A VMM host is added.	The VMM host and virtual hosts running on the VMM host are registered.
A VMM host is deleted.	VMM host information of the host is deleted. Information about the virtualization system management host that manages the VMM host is deleted. The VMM host is displayed directly under the Host List because the relationship between the virtual host and the VMM host is broken.

(b) When virtualization configuration information is deleted

If the host type in the collected virtualization configuration information is Logical host or Unknown, virtualization configuration information cannot be maintained. Therefore, even if virtualization configuration information is set when the host type is Physical host or Virtual host, if the host type is changed to Logical host or Unknown, the virtualization configuration information is deleted.

The following table describes the cases when virtualization configuration information is deleted when the host type is changed.

Table 7‒24: Cases when virtualization configuration information is deleted when the host type is changed

Host type before change	Host type after change
	Physical host	Logical host	Virtual host	Unknown
Physical host	N	Y	N	Y
Logical host	--	--	--	--
Virtual host	N	Y	N	Y
Unknown#	--	--	--	--

(c) When VMM host information is deleted

VMM host information is deleted from the IM configuration management database in the following cases:

• The virtualization system management host on which vCenter, JP1/SC/CM, SCVMM, or HCSM is installed is deleted.

• The virtual manager type of the virtualization system management host on which vCenter, JP1/SC/CM, SCVMM, or HCSM is installed is changed.

• The host type of the virtualization system management host on which vCenter, JP1/SC/CM, SCVMM, or HCSM is installed is changed.