![]() You will have 2 days of rolling protection. Let’s say you perform snapshots once every 4 hours and you keep 16, (first in, first out or otherwise known as “FIFO”). Typically, a policy is set up within the array to take “snapshots” on some specific schedule. I will use VMFS in this example since it has a datastore on it which has VMs residing within that datastore. With storage replication you have a LUN, which is mapped to a host as a volume, which then gets presented up to the host/cluster and gets formatted in whatever file format your hypervisor uses. When it arrives, it is an image of what that VM looked like at the time in which the replication was initiated.įirst let’s define the three types of replication as they pertain to this article: storage replication, agent-based replication, and hypervisor-level replication using native hypervisor snapshots. This means you have a copy of the source at some specific point in time that is sent to a target. What does “replication” really mean? Well, simply put, replication is a point-in-time copy of data. I am focusing on ways to replicate data from one hypervisor to another, whether that be the same or different hypervisors. Technologies like SRDF, which was used on the EMC Symmetrix storage platform, have been used and are still being used by many Fortune 500 organizations and companies around the world. There is a long history of these technologies being used within the physical world going back decades. CDP as it pertains to a virtual environment. Let’s first start off with a high-level primer of each. Well… There are a lot of differences! Both operational recovery replication and CDP serve a similar purpose, but they achieve their goals very differently. CDP (Continuous Data Protection) What are the Big Differences? On the next run, Veeam Backup & Replication will continue data transfer for those disks for which Veeam Backup & Replication has started data processing and created snapshots during the current run.Operational Recovery Replication vs. Veeam Backup & Replication can resume the replication process if data transfer was not finished, for example, if the replication job did not finish within the allowed backup window or the network connection failed. After the backup proxy finishes reading VM data, Veeam Backup & Replication requests Microsoft Hyper-V VSS to delete the volume snapshot or VM checkpoint.The target host decompresses VM data and writes the result to the destination datastore. ![]() The source proxy compresses VM data and transports it to the target host. It filters out zero data blocks, blocks of swap files and blocks of excluded VM guest OS files. While copying VM data, the source proxy performs additional processing. If CBT is not available, the source proxy interacts with the backup repository to obtain replica metadata, and uses this metadata to detect blocks that have changed since the previous job session. During incremental job sessions, the source proxy uses changed block tracking (CBT) to retrieve only those data blocks that have changed since the previous job session. The source backup proxy reads the VM data from the volume snapshot or VM checkpoint and copies it.Microsoft Hyper-V VSS creates a volume snapshot or VM checkpoint, depending on the hypervisor version. Veeam Backup & Replication requests Microsoft Hyper-V VSS to create a cohesive point-in-time copy of a VM.If application-aware image processing is enabled for the job, Veeam Backup & Replication connects to VM guest OSes, deploys non-persistent runtime components or uses (if necessary, deploys) persistent agent components on VM guest OSes and performs in-guest processing tasks.Veeam Backup & Replication queries information about VMs and virtualization hosts from Microsoft Hyper-V.The source proxy (on-host or off-host) establishes a connection with the target host and backup repository.Then Veeam Backup & Replication establishes a connection with source proxy (on-host or off-host), target host and the backup repository, and sets a number of rules for data transfer, such as network traffic throttling rules and so on. Veeam Backup & Replication checks what backup infrastructure resources are available, and assigns backup proxies and backup repositories to process the tasks.For every disk of a VM added to the job, Veeam Backup & Replication creates a new task. When a new replication job session starts, Veeam Backup & Replication reads job settings from the configuration database and creates a list of VMs to process.Veeam Backup & Replication performs VM replication in the following way:
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