Perform pre-setup preparations for the primary and backup sites.
Storage unit replication
Replicate the primary site information to the backup site using the storage unit replication function.
The replication targets are the LUNs storing the following information. Refer to "Table 3.1 Replication of Storage Units".
Replication Target Information | Type of LUNs to Store Information | Number of LUNs | Remarks | |
|---|---|---|---|---|
Folder containing switchover information | LUNs with FC or iSCSI connections | Primary site | 2 (*1) | Refer to "3.2 Creating Switchover Information Folders". Perform interactive copy from the primary site to the backup site, and from the backup site to the primary site. Configure the replication control item (copy group) for each site. |
Backup site | 2 (*2) | |||
Disk resources and virtual storage resources stored in the storage pools of the replication targets (*3) | LUNs with FC, iSCSI, or NAS connections (*4, *5) | Primary site | Number of LUNs used by the disk resources and the virtual storage resources stored in the storage pools of the replication targets. | Configure the control unit (copy group) of the replication targets for each unit to perform switchover. |
Backup site | Same number as the primary site (*6) | |||
*1: The following LUNs are necessary:
LUNs for the switchover information folder of the primary site
LUNs for the replication destination used for the switchover information folders of the backup site
*2: The following LUNs are necessary:
LUNs for the switchover information folders of the backup site
LUNs for the replication destination used for the switchover information folders of the primary site
*3: The tenants, L-Platforms, L-Servers for the infrastructure administrator, and images using the disk resources or virtual storage resources in the storage pool are the switchover targets on the backup site. Refer to "2.3 Limitation of Switchover Scopes".
*4: LUNs with iSCSI or NAS connections are only supported when used for virtual L-Server switchover (VM guests).
*5: For the LUNs used in the virtual L-Server switchover (VM guest) method, before starting replication, check that the replication destination LUNs are not regarded as the datastore on the switchover destination VM management software.
When the LUNs are regarded as the datastore, perform the following operations, and ensure that the LUNs are not regarded as the datastore.
For the VMFS datastore
Delete the corresponding datastore on the arbitrary VM host.
Also, on the VM host which the datastore is shared, check that deletion of the datastore was detected. Example: Rescan the datastore on each VM host
For the NFS datastore
Unmount the corresponding datastore from each host.
For details of the operation, refer to the VMware manuals.
*6: Number of LUNs of the replication targets used by the disk resources and the virtual storage resources stored in the storage pools of the primary site replication targets.
Figure 3.1 Replication of Storage Units
For details on storage replication, refer to "17.1.3 High Availability for Storage Chassis" in the "Operation Guide CE".
Disaster Recovery can be operated on LUNs created beforehand or on dynamic LUN mirroring (DLM) storage of ETERNUS. For details on prerequisites for storage replication, refer to "7.2 Storage Chassis High Availability Design" in the "Design Guide CE".
For primary sites, it is not necessary for the disk resources for the backup site to have been detected. Therefore, it is not necessary to connect storage units for the backup site to the server for the primary site.
When creating physical L-Servers
Refer to "Appendix D Preparations for Creating a Physical L-Server" in the "Design Guide CE".
When creating virtual L-Servers using server virtualization software
Refer to "Appendix E Preparations for Creating a Virtual L-Server" in the "Design Guide CE". Installation of VM management software on the backup site is not necessary when it is installed on physical L-Servers on the primary site.
When using VMware virtual L-Servers for physical/virtual L-Server switchover (VM host/VM guest)
Enter the following commands for the VM host and disable detection of the copied LUNs.
>esxcfg-advcfg -s 0 /LVM/DisallowSnapshotLUN <RETURN> |
Note
LUNs which were created by ETERNUS dynamic LUN mirroring (DLM) are handled as LUNs created beforehand after a disaster recovery failover from the primary site to the backup site. Replication settings must be performed manually before future switchover operations because automatic replication setting is not available for LUNs created beforehand. For details about LUNs created by dynamic LUN mirroring (DLM) and LUNs created beforehand, refer to "D.3 Storage Preparations" in the "Design Guide CE".
When using Hyper-V virtual L-Servers for physical/virtual L-Server switchover (VM host/VM guest)
It is necessary to also configure the remote management authentication settings on the admin server of the backup site.
For details, refer to "E.2.5 Pre-setup Preparations in Hyper-V Environments" in the "Design Guide CE".
