i search to find anything about the performance impact of using CDP for Replication on Primary and DR Site.
We are using VMware vSphere 8 with 20x ESXi Server with 350 VMs (Internal and external customers) on our Datacenter. (Primary Site) All Virtual Machines are placed on 3x StarWind VSAN High Availability groups with 45 TB each of AllFlash (24x 1,92 SAS SSD in RAID-50) datastores. We are using ISCSI iSER for Storage connect with redundant 25 Gbit links.
We are on the investigation to build a new Backup and DR strategy with a second Site as Disaster Recovery for all of the virtual machines we are hosting. Since we have a Co-Location with redundant dark fibre connects (100 Gbit/s) it is easily to implement a second DR site there with Computing and Storage Nodes or maybe HCI.
At the moment we are using 1x Hardware Standalone VBR Server acting as Primary Backupserver backed with Local Storage. 24x NL-SAS HDD with 24 TB Capacity in RAID-10 resulting in 280 TB raw capacity + Wasabi S3 for Offsite Backups. Unfortenately one of our Customers needed a Instant VM Recovery 2 weeks ago of their main fileserver which hosted critical data and profiles for them. Instant VM Recovery was pretty slow and took more than 32 hours to finish since the backend storage of the server only delivers a max of 2400 IOPS. Backups were running fine with this system but instant VM Recovery with storage VMotion and random IOPS of the users which tried to access the files was incredibly slow. This was expected because of the underlying storage which are HDDs.
Because of this situation we want to build a new design with hardware we already owned. The idea is to upgrade 3x Dell R540 Server with 12x 7,68 SATA SSD, 25 Gbit Mellanox Nics and use these 3 Systems as SOBR + CDP PROXY + VMware Proxy (SAN Transport) for the primary backups with short retention policy. The Main VBR Server for the Management will be placed on a Virtual Machine. The big system with 24x NL-SAS HDD will be unconfigured to a hardened repository with RAID-60 with 480 TB for long term archival. Wasabi S3 will be used too for Offsite Backups to Cloud. We already have a tape library (LTO-8) too which we can use together with this design.
On Our Co-Location we will build a Computing Cluster under an own vCenter with storage for replication datastores. Since the RPO for all systems should be 15 to 60 mins we would like to know if the CDP Replication has a significant impact of the performance on source VM. I know that traditional VMware snapshots has an impact on every VM. It can be microseconds to seconds and depends on the underlying storage.
Can anyone which is using CDP already give me some hints how CDP replication affects performance of the source or target VMs ? Unfortenately we have no experience with this absolutely great feature at the moment
Thanks very much for every answer i can get.
Best regards.