Veeam CDP (Continuous Data Protection) is one of my best new feature in Veeam Availability Suite 10 (Veeam Backup & Replication v10), it provides better SLAs for end-users by using new VMware technology. Veeam CDP (without snapshots) – VMware continuous data protection to reduce RPOs from minutes to seconds. It leverages VMware’s VAIO framework to reliably intercept and redirect VM I/O to the replica without a need to create standard VM snapshots.
Veeam CDP, the new Continuous Data Protection technology that is best compared to Veeam’s current replication functionality, except it, allows to achieve recovery point objectives (RPO) – maximum acceptable data loss in case of disaster – of mere seconds and without using VMware snapshots, thus not impacting protected workloads. Veeam achieves this by using the new VMware technology called vSphere API for I/O filtering (VAIO), which is VMware-supported way to tap into VM’s I/O stream. This capability changes the game because until now, Veeam’s competition required either the use of agents inside of the protected Virtual Machines or some dirty hacks explicitly unsupported by VMware.
About VMware VAIO:
VAIO is a framework that enables their parties (Partners) to develop filters that run in ESXi and can intercept any IO requests from a guest operating system to a virtual disk. An IO will not be issued or committed to disk without being processed by IO Filters created by 3rd parties.
VAIO Overview Architecture:
IO request moving between the guest operating system (Initiator), located in the Virtual Machine Monitor(VMM), and a virtual disk (Consumer) are filtered through a series of two IO Filters (per disk), one filter per filter class, invoked in filter class order. For example, a replication filter executes before a cache filter. Once the IO request has been filtered by all the filters for the particular disk, the IO request moves on to its destination, either the VM or the virtual disk.
The CDP job is similar to a Replication job but there is a difference in “Schedule” tab. Advanced policy job allows improving RPO to few seconds:
You can find the feedback of Michael White (vExpert & Blogger) about when using CDP below:
-You can still use the original Veeam replication.
-Templates and powered off virtual machines will not be able to be replicated by CDP at 1.0.
-You should not use CDP to replicate everything, but rather think about what applications require that functionality. So, applications that you cannot run your business without.
-If you can choose a bigger replication interval you should. If you pick 60 seconds or 5 minutes for example CDP has more time to organize the replication and can do things like deduplication as it does not have to work as hard to keep up. If you choose 5 seconds it will do not be able to organize the replication as much since it needs to work fast to maintain the RTO. This has an impact on your network requirements.
-You should pick what you think is reasonable and appropriate and monitor it and see how it works.
-Remember that applications that are very transnational oriented and have lots of changes will not handle the very lowest interval as well as an application that is not highly transnational so make sure you test to see what works best for you.
You can learn more here.
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