Perform pre-setup preparations for the switchover source and destination sites.
Replication of Storage Units
Replicate the switchover source site information on the switchover destination 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 | |
|---|---|---|---|---|
| Switchover information storage folder (*1) | LUNs with FC, iSCSI, or NAS connections (*2) | Switchover source site | 2 (*3) |
Refer to "3.2 Creating Switchover Information Storage Folders". Perform interactive copy from the switchover source site to the switchover destination site, and from the switchover destination site to the switchover source site. Configure the replication control item (copy group) for each site. |
| Switchover destination site | 2 (*4) | |||
| Disk resources and virtual storage resources stored in the storage pools of the replication targets (* 5) | LUNs with FC, iSCSI, or NAS connections (*6, *7) | Switchover source 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. |
| Switchover destination site | Same number as the switchover source site (*8) | |||
*1: For the operation with manually copied switchover information storage folders, it is not necessary to replicate the disk on which the switchover information storage folder is stored. For the operation performed with the manually copied switchover information storage folder, refer to "8. Transfer the Switchover Information Storage Folder" in "Chapter 4 Operation".
* 2: FOR Windows managers set to collect switchover information automatically (refer to "3.7 Configuring Automatic Collection of Switchover Information"), LUNs with NAS connections cannot be used. This is because the automatic collection of switchover information is performed using "local system account", and services executed using the account have limited reference for network drives due to the nature of Windows OSs.
* 3: The following LUNs are necessary:
* 4: The following LUNs are necessary:
*5: 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 switchover destination site. Refer to "2.4 Limitation of switchover scope and additional recovery".
*6: LUNs with iSCSI or NAS connections are only supported when used for virtual L-Server switchover (VM guests).
*7: 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.
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
Unmount the corresponding datastore from each host.
For details of the operation, refer to the VMware manuals.
*8: Number of LUNs of the replication targets used by the disk resources and the virtual storage resources stored in the storage pools of the switchover source site replication targets.
For details on storage replication, refer to "18.1.3 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".
Note
LUNs created by ETERNUS dynamic LUN mirroring (DLM) are handled as LUNs created beforehand once they are switched from the switchover source site to the switchover destination site. Depending on the failback method, LUNs may be handled as LUNs created by dynamic LUN mirroring (DLM). For details, refer to "4.4 Failback after Recovery of the Switchover Source Site".
Replication settings for LUNs created beforehand must be performed before the next switchover operation because automatic replication setting is not available for such LUNs.
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".
For switchover source sites, it is not necessary for the disk resources for the switchover destination site to have been detected. Therefore, it is not necessary to connect storage units for the switchover destination site to the server for the switchover source site.
Path Configuration for Replication Software
Configuration is required when performing "3.7 Configuring Automatic Collection of Switchover Information".
When the replication software being used is ACM-CCM or SnapMirror, this procedure is not required.
[Windows Manager]
navisphere
<Navisphere CLI Installation Path>
Example
C:\Program Files (x86)\EMC\Navisphere CLI
Solutions Enabler
<SYMCLI Installation Path>\bin
Example
C:\Program Files (x86)\EMC\SYMCLI\bin
Restart the OS to enable the environment variables by the SYSTEM user.
[Linux Manager]
Add the following path to the end of the "/etc/profile" file depending on the type of replication software that will be used. Perform this operation on the server on which the Resource Orchestrator manager and the replication software are installed.
NaviSphere
PATH=$PATH:/opt/Navisphere/bin
SolutionsEnabler
PATH=$PATH:/usr/symcli/bin
Execute the following command from the console.
source /etc/profile
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 switchover destination site is not necessary when it is installed on physical L-Servers on the switchover source 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
When performing switchover of VMware virtual L-Servers (VM guest), do not disable detection of copied LUNs.
Information
To enable detection of copied LUNs on a VM host of VMware with that function disabled, execute the following command on that VM host:
>esxcfg-advcfg -s 1 /LVM/DisallowSnapshotLUN <RETURN>
For details, refer to the VMware documentation.
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 switchover destination site.
For details, refer to "E.2.5 Pre-setup Preparations in Hyper-V Environments" in the "Design Guide CE".
When using OVM for SPARC virtual L-Servers for virtual L-Server switchover (VM guest)
Configure the virtual disk service for the disk used for the switchover target guest domain and its replicated disk, and then register the disk resources.
If the network settings are not same on both sites, network communication to and from the guest domain may not be possible on the switchover destination site.