Use of WinCC OA in VMware vSphere cluster solutions
This FAQ is for information about the advantages and disadvantages about the usage of VMware vSphere clusters with WinCC OA.
There are 5 configuration options:
- VMware vSphere vMotion®
- VMware vSphere Storage vMotion
- VMware vSphere High Availability (HA)
- VMware vSphere Fault Tolerance (FT)
- vSphere Storage Appliance (VSA)
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- WinCC OA is already released for:
Virtualization on vmWare
- WinCC OA will be released for:
Virtualization on vmWare Clusters (without special vSphere options)
- WinCC OA evaluates the release for:
vSphere High Availability virtualization on vmWare Clusters
- WinCC OA will not be released (in near future) for:
vSphere Fault Tolerant option (Nr. 4)
vSphere vMotion option (Nr.1)
Note: Due to known issues with the 5th option is this one not supported by WinCC OA.
This table shows the advantages and disadvantages of a WinCC OA System in combination with a VMware vSphere cluster.
| Functionality | WinCC OA with built in redundancy on dedicated servers | VMware HA without built in WinCC OA redundancy | WinCC OA Redundant WinCC OA on vSphere HA cluster |
|---|---|---|---|
| Operability | Seamless redundancy switch | >15s | Seamless redundancy switch |
| Data loss | No data loss | >15s | No data loss |
| Connection loss to PLC | Seamless redundancy switch | >15s | Seamless redundancy switch |
| Failover | Supervises the status of both redundant servers and the rules for the switchover of the active system can be parameterized | Cover faults caused by a total failure of a server | both advantages available |
| Geographically distribution | Yes | Yes | Yes |
| Availability | High Availability | High Availability | High Availability |
| Setup and reinstallation of a destroyed server hardware | ~4hours | ~minutes | ~minutes |
| Performance | High Performance | Performance degraded due to virtualization | Performance degraded due to virtualization |
| Configuration | High effort | Lower effort | Lower effort |
| Online Version Upgrade | WinCC OA can be updated in split mode during system operation | Offline update | WinCC OA can be updated in split mode during system operation |
| IEC 61508 (SIL) certification | Up to SIL 3 for use on non virtualized platforms | Not available | Not available |
For detailed information have a look to our Use of WinCC Open Architecture in VMware vSphere cluster solutions presentation
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