Switchover Levels

The following levels of switchover are supported:

Table 2.10 Switchover levels
Item	Content	Remarks
Switchover levels	Site switchover	This cannot be performed in Active-Active operation.
Switchover levels	Tenant switchover	When the configuration is for performing physical/virtual L-Server switchover (VM host/VM guest), tenant switchover cannot be performed.

Before performing tenant switchover, check the following advisory notes.

Note

Advisory notes for using network devices are given below.
- For each item for which switchover will be performed, prepare the network devices for both the switchover source site and the switchover destination site.
- For the network devices prepared for switchover targets, use the same resource name when registering them in the network resource trees of both the switchover source site and the switchover destination site.

Do not use network devices prepared for switchover levels selecting from L-Platforms that belong to another switchover level.

Perform design so as not to use the same virtual storage resources for tenants switched over separately.
Configure the control item (copy group) for storage replication for each tenant being switched over simultaneously. Refer to "Configuring Copy Groups".
There are specified locations for storing switchover target resources. For details, refer to "Storage Location of Switchover Target Resources for Tenant Switchover" in "3.4 Configuring Managed Resources".
Address set resources cannot be shared among tenants. Register the address set resources in the local pool for each tenant.
There are some notes on the setting of resource names, etc. For details, refer to "2.6.3 Items to Be Different between the Switchover Source and Destination Sites".

Before tenant switchover, lock the resources used by the target tenants to be switched over in the switchover source site. Locking resources prevents the overlapping use of the resource in multiple sites. Refer to "Locking Resources". For details on how to lock and unlock resources, refer to "4.2 Switchover between Sites Using the Disaster Recovery Function".

Table 2.11 Operations Restricted by Locking Resources
Resource	Operations Restricted by Locking
Network Resources	Deployment using the relevant resources Migration to another pool Release of registered resources Deletion of resources Creation of an L-Server for which only the configuration definition has been created, that uses the relevant resources Registration of physical servers of relevant subnets in the server tree
Address set resources	Deployment using the relevant resources Migration to another pool Release of registered resources Deletion of resources Creation of an L-Server, consisting of an L-Server definition for which only the configuration definition has been created, that uses the relevant resources
Disk resources	Deployment using the relevant resources Migration to another pool Unregistration from pools
Virtual Storage Resources	Deployment using the relevant resources Migration to another pool Unregistration from pools Starting of an L-Server for which only the configuration definition has been created, that uses the relevant resources
Pool resources	Deletion of a storage pool where disk resources have been locked
L-Servers	Configuration changes using locked resources (addition of NICs and attachment of disks) Using virtual machines with locked resources as L-Servers

The following template information used for the switchover target tenants should be created as tenant-specific templates.
- Software information
- Image information
- Segment information
- L-Platform Templates
When created as global templates, they may also be used for tenants outside the switchover targets. In this case, the tenants cannot be deleted from the switchover source site after switchover, and information with the same IDs will be copied to the switchover destination site.

When creating tenant-specific image information, use tenant-specific software information and cloning images in the local pool of the tenant.
Cloning images in global pools may not be included in switchover targets. If no suitable resource exists, the template information cannot be used.

When creating tenant-specific L-Platform templates, it is recommended to use tenant-specific information on images and segments.
While the information on images and segments of global templates refers to resources in global pools, the resources may not be included in switchover targets. If no suitable resource exists, the template information cannot be used.

Figure 2.7 Configuring Copy Groups

Figure 2.8 Locking Resources

2.3 Switchover Levels