Manage disaster recovery
|
|
ARM hosts do not support disk backup-based disaster recovery. |
Disaster recovery management (DRM) provides service recovery across different sites. You can configure a CVM site as the protected site, configure a recovery site for the protected site, and add the protected and recovery sites to a protection group. When the protected site stops providing services, the recovery site can take over to guarantee uninterrupted services based on the configured recovery plan and policy.
CAS provides the following disaster recovery methods depending on data protection method:
Storage replication—Storage replication disaster recovery relies on array-based replication to provide service backup and recovery across different sites. The protected site and recovery site can perform automatic service recovery if both of them support storage replication adapters (SRAs). If the storage arrays of the sites do not support SRAs, you must manually prepare the storage environment before switching over the services between sites. As a best practice, use storage arrays that support SRAs.
Disk backup—You use a VM or production node (physical device) installed with disaster recovery software as a protected object and use a local CVM site as the recovery site. With the real-time replication function provided by the client software, you can protect the data on the source VM. With the snapshot chain and real-time synchronization mechanisms, data can be backed up and synchronized in seconds to satisfy the requirements of high-performance RPO data recovery.
Restrictions and guidelines
Disaster recovery does not support IPv6 hosts or vSwitches.
If you use storage arrays that do not support SRAs to perform storage replication disaster recovery and the protection and recovery storage pools use different names, the recovery storage pool might fail to process the image chain relationships. As a result, the system might fail to rebuild the external snapshot image chain for a VM in the recovery site.