Hello Team.
We have a fully functional IBM SVC3 2145 Enhanced Stretched Cluster spanning two sites (10km apart). IBM Flash systems (FS7300) are behind SVCs. SVC Quorum (IP) is in a 3rd site in Public Cloud. A year or more back hardware was also refreshed.
Is it possible to convert the current setup to largely new superseded PBHA (Policy Based High Availability) Solution. Is there a IBM supported way to do that, or that would involve a huge hardware/software infra change.
What we need to consider if we want to go for a PBHA.  Thanks in advance.

Hi 

There is an IBM Redbook about PB-HA which contains the migration method from Hyperswap to PB-HA. You can read it, but it does not cover the migration of Enhanced Stretch Clusters to PB-HA. However, the idea is almost the same and simple.
https://www.redbooks.ibm.com/abstracts/sg248569.html

Thanks, Nezih. Much appreciated. so, out of the below steps, in which part there will be an outage/scheduled downtime. Unconfigure HyperSwap - Does this topo change will break something.  Remove Enclosure - Does this means physical removal of the enclosure. Initialize a new system - which new system is this.  Does this mean the process to start PBHA.  Thanks.

Hi Bacil,

If you design your migration steps carefully, there will be no downtime. Unconfiguring the Stretch Cluster and changing the topology does not affect host I/O.
You need to carefully design this process: when you remove a copy of a volume or an I/O group from the Stretch Cluster, the hosts must still be able to access the surviving copy.