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, iSCSI, or NAS connections (*1) | Primary site | 2 (*2) | 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 (*3) | |||
Disk resources and virtual storage resources stored in the storage pools of the replication targets (*4) | LUNs with FC, iSCSI, or NAS connections (*5, *6) | 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 (*7) | |||
*1) 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.
*2: 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
*3: 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
*4: 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 "2.4 Limitation of Switchover Scope and Additional Recovery".
*5: LUNs with iSCSI or NAS connections are only supported when used for virtual L-Server switchover (VM guests).
*6: 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.
*7: 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 "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 primary site to the backup 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 Primary 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 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.
Path Configuration for Replication Software
Configuration is required when performing "3.7 Configuring Automatic Collection of Switchover Information".
When the replication software to use is ACM-CCM or snapmirror, this procedure is not required.
[Windows Manager]
Add the following path to the PATH environment variables depending on the replication software that will be used. Perform this operation on the server on which the replication software is installed.
navisphere
<Navisphere CLI Installation Path>
Example
C:\Program Files\EMC\Navisphere CLI
Solutions Enabler
<SYMCLI Installation Path>\bin
Example
C:\Program Files\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 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
When performing virtual L-Server switchover (VM guest), do not disable detection of copied LUNs.
Information
On VM hosts of VMware on which detection of copied LUNs is disabled, the function for detecting replicated datastores as snapshot LUNs is disabled. Consequently, replicated datastores can be mounted automatically on VM hosts without re-signing for datastores (UUID modification) by users.
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 backup site.
For details, refer to "E.2.5 Pre-setup Preparations in Hyper-V Environments" in the "Design Guide CE".
